Caterpillarengine - industrialgas engine

Caterpillar G3306

Maintenance schedule, common problems & OEM parts breakdown

The G3306 is a bare industrial power unit, not a complete machine: an in-line 6-cylinder, 4-stroke, spark-ignited natural gas engine built on Caterpillar's 3300 block, offered naturally aspirated (NA) or turbocharged-aftercooled (TA/TAA). Displacement is 10.5 L (638 cu in) with a bore and stroke of about 121 mm x 152 mm (4.75 in x 6.0 in); gross output runs from 108 bkW (145 bhp) on the NA rating up to roughly 151-157 bkW (203-211 bhp) on TA ratings, all at 1800 rpm. Net dry weight holds around 948 kg (2090 lb) across both aspiration types. Serial records trace this gas engine's production back to the early 1980s, carried forward from Caterpillar's earlier plain 3306 natural gas engine parts book before the G-prefix naming was adopted. Cat sold it as a bare power unit, as a factory generator set (roughly 75-160 kW electrical output depending on rating and enclosure), as a mechanical or compressor drive for gas-gathering and gas-lift service, as a stationary pump drive, and as an on-highway truck engine variant.

Through its production run the G3306 kept a mechanical or hydra-mechanical governor and a magneto/distributor ignition system as standard equipment, with an electronic governor offered only as an option, and a compression ratio split between an 8:1 low-compression rating and a 10.5:1 high-compression rating tied to the aspiration and duty package chosen. Caterpillar's later G3306B carried the same gas-engine platform to ADEM A4 electronic ignition and governing plus factory air-fuel ratio control and catalyst hardware for emissions-compliant sites, and that is the documented next step for this engine family in compression-drive service. That gap is exactly why the base G3306 still matters in the used and parts market today: large numbers remain at work in gas-gathering compressor stations, irrigation pump drives, and standby or prime generator service, and a mechanical governor with distributor ignition keeps it serviceable without an engine control module. Rebuilds and running used units continue to trade on well-understood parts and a service routine any gas-engine mechanic already knows.

Below: full specifications, fluids & capacities, the factory service schedule, common service parts, verified fault codes, what owners discuss, attachment guidance, the complete assembly directory, and a serial-number reference. Complete parts lists with full OEM part numbers, exploded diagrams, quantities, and fitment data are available free in Heavy Parts AI.

Caterpillar G3306 specifications

Engine

ConfigurationIn-line 6-cylinder, 4-stroke-cycle, spark-ignited industrial gas (natural gas / gaseous fuel) engine, offered naturally aspirated (NA) or turbocharged-aftercooled (TA)
Gross power, naturally aspirated108 bkW (145 bhp) @ 1800 rpm
Gross power, turbocharged-aftercooled151-157 bkW (203-211 bhp) @ 1800 rpm, varies by rating package
Displacement10.5 L (638 cu in)
Bore x stroke121 mm x 152 mm (4.75 in x 6.0 in)
Compression ratio8:1 on the low-compression rating, 10.5:1 on the high-compression rating; varies by rating package
GovernorHydra-mechanical standard; electronic governor offered as an option depending on rating package
Emissions tierRich-burn combustion built to meet U.S. EPA spark-ignited stationary NSPS 2007/8 and 2010/11 limits when paired with an air/fuel ratio control and three-way catalyst; 0.5 g or 1.0 g NOx per bhp-hr catalyst settings available

Weights

Net dry engine weight (bare engine, NA or TA)948 kg (2090 lb)
Packaged generator set shipping weightAbout 1490-1600 kg (3285-3520 lb), varies with electrical output and cooling configuration
Ground pressureNot applicable — stationary industrial engine, no undercarriage

Dimensions

Length (bare engine)1539 mm (60.6 in)
Width (bare engine)978 mm (38.5 in)
Height (bare engine)1261 mm (49.7 in)
Flywheel / flywheel housingSAE No. 1 flywheel and flywheel housing on the bare engine
Packaged generator set envelopeOverall length about 2263-2352 mm (89.1-92.6 in), width about 818-978 mm (32.2-38.5 in), height about 1210-1269 mm (47.7-50.0 in); varies by aspiration and cooling configuration

Performance

Rated speed1800 rpm, continuous duty
Power at 75% load, naturally aspirated81 bkW (109 bhp)
Power at 75% load, turbocharged-aftercooled113 bkW (152 bhp)
Speed turndown at rated torque, sea levelAbout 44% on naturally aspirated, about 33% on turbocharged-aftercooled; varies by rating package and altitude
Required fuel gas supply pressure10.3-69 kPa (1.5-10 psi) naturally aspirated; 83-172 kPa (12-25 psi) turbocharged-aftercooled
RotationCounterclockwise, viewed from the flywheel end

Service capacities (summary)

Fuel tankNot applicable — engine runs on an external natural gas or gaseous fuel supply, no onboard fuel tank
Cooling system (jacket water refill, engine only)20 L (5.3 US gal)
Engine oil (lube system refill)45.1 L (11.9 US gal); routine service interval about 750 hours, extendable with oil/coolant condition sampling
Hydraulic systemNot applicable — bare industrial engine has no onboard hydraulic system

Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.

G3306 fluids & capacities

SystemCapacityRecommended fluid
Engine crankcase (oil pan, lube oil system refill, includes filter change)45.1 L (11.9 US gal) refill; oil and filter service interval about every 750 hours (varies with duty/fuel quality and S·O·S oil-sample results)Cat low-ash Natural Gas Engine Oil (NGEO), SAE 40 single-grade, formulated for spark-ignited gaseous-fuel engines (roughly 0.4-0.6% sulfated ash). Standard diesel engine oil (Cat DEO) is not suitable here - gas engines need the low-ash formulation to control valve and combustion-chamber deposits. Equivalent low-ash gas engine oils marketed for the G3300/G3400/G3500/G3600 engine range are accepted alternates. No separate summer/winter viscosity split is published for this engine; single-grade SAE 40 covers the normal ambient range, check with your dealer for cold-climate starting aids.
Cooling system (jacket water)20 L (5.3 US gal), engine-only fill; add for radiator/heat-exchanger/expansion-tank options if fitted, which are not part of the base engine figureCat Extended Life Coolant (ELC) preferred, or a commercial extended-life coolant meeting the Cat EC-1 specification. Cat Diesel Engine Antifreeze/Coolant (DEAC) is an accepted alternate, conditioned with Cat Supplemental Coolant Additive (SCA) on the scheduled interval. Thermostat regulates to a full-open temperature around 97 C (207 F).
Fuel supply (natural gas)No on-board liquid fuel tank - runs from an external natural gas supply line. Minimum supply pressure varies by configuration: roughly 10-12 kPa (1.5 psi) on naturally aspirated ratings up to about 83-172 kPa (12-25 psi) on turbocharged-aftercooled ratingsPipeline-quality dry natural gas per the low heat value the rating is based on, about 35 MJ/m3 (905 Btu/ft3). No lubricant/fluid brand applies to the gas supply; a separate fuel filter/gas pressure regulator is used ahead of the carburetor.
Transmission / final drives / hydraulic system and tank / axles-differentialsNot applicableNot applicable. The G3306 is sold as a bare industrial power unit (engine only) used to drive gas compressors, pumps, or generator sets. It has no integral transmission, final drive, hydraulic system, or axle/differential, so these fluid groups are not part of its OMM fluid chart.
Grease (spec only)No discrete grease capacity is published for the base engine packageGeneral-purpose NLGI No. 2 multipurpose grease for any externally mounted accessory-drive bearings or control linkage points (for example optional jacket-water/aftercooler pump bearings or throttle linkage) when fitted. No dedicated Cat grease brand is called out in the base engine literature.

Capacities are refill values from factory literature — always fill to the dipstick/sight gauge, not the number.

Caterpillar G3306 maintenance schedule

Service intervalTasks
Every 50 h
  • Check crankcase oil level before each start and top off with the specified low-ash natural gas engine oil.
  • Check jacket water level and inspect hose and fitting connections for coolant, fuel, or oil leaks.
  • Listen for detonation, knock, or exhaust popping during warm-up and at rated load.
  • Check fuel gas supply pressure at the regulator against the rating plate setting.
  • Weekly: drain water or sediment from the fuel gas filter or scrubber, if fitted.
  • Weekly: walk down the exhaust system and gas train checking for loose fasteners or a fuel odor.
Every 250 h
  • Pull an oil sample for wear-metal and condition analysis before deciding on an early oil change.
  • Pull a coolant sample and check corrosion-inhibitor condition.
  • Service the air cleaner element or check the restriction indicator.
  • Check fan and water pump drive belt tension and condition.
  • Inspect the distributor cap, rotor, and ignition leads for wear, cracking, or carbon tracking.
  • Check governor linkage for wear, binding, or looseness.
Every 500 h
  • Change engine oil and filter, or extend the interval based on oil-sample results.
  • Replace the fuel gas filter element.
  • Check and adjust ignition timing against the rating plate setting.
  • On turbocharged-aftercooled units, inspect the turbocharger for oil leakage, shaft play, and boost pressure.
  • Inspect the aftercooler core for water-side scale or restriction on turbocharged-aftercooled units.
Every 1,000 h
  • Measure and record valve stem projection, establishing a baseline on a new or rebuilt cylinder head.
  • Check and adjust valve lash on intake and exhaust valves.
  • Inspect and clean or replace the distributor cap, rotor, and spark plugs.
  • Re-verify ignition timing against the rating plate setting.
  • Inspect the water pump for leakage and bearing play.
  • Check crankcase blowby and breather flow for signs of ring wear.
Every 2,000 h
  • Replace spark plugs and re-check gap against the rating.
  • Re-check valve lash and record valve stem projection at the plug change.
  • Clean and inspect the carburetor or gas mixer low-speed circuit.
  • Inspect ignition transformer or magneto output and wiring insulation.
  • Borescope a cylinder for combustion-chamber deposit buildup if compression is trending down.
  • Check the flexible drive coupling and flywheel housing alignment.
Every 4,000 h
  • Replace ignition transformer or magneto components reaching end of service life, especially on high-compression ratings.
  • Run a compression or cylinder-pressure check across every cylinder and compare against baseline.
  • Inspect the exhaust manifold, turbocharger, and aftercooler group for cracking, leakage, or fouling.
  • Sample oil and coolant for wear-metal trend and use it to plan the next top-end service window.
Every 8,000 h
  • Remove the cylinder head for valve, guide, and seat inspection or reconditioning.
  • Inspect piston rings, cylinder liners, and rod and main bearings against factory wear limits.
  • Inspect the camshaft, lifters, and gear train for wear.
  • Overhaul or replace governor and gas train components as condition warrants.
  • Reset oil and coolant sample baselines after major component replacement.

Servicing the G3306 beyond the schedule

Predictive Maintenance & Fluid Analysis

Pull an oil and coolant sample on schedule to track wear metals and stretch the low-ash natural gas engine oil fill past the base interval when trends allow. Read spark plug color and deposit pattern at every change; it is the fastest air-fuel ratio check on this magneto-ignition engine. Trend compression readings cylinder to cylinder to catch valve and ring wear before it becomes a top-end job. Watch jacket-water temperature and, on turbocharged units, boost pressure against baseline to catch cooling-package or aftercooler fouling.

Corrective & Common Repairs

Rough idle or an intermittent miss on the base engine traces almost always to a worn distributor cap, rotor, or plug wire, not an electronic fault. Surging or hunting rpm comes from worn governor linkage or a dirty carburetor idle circuit; clean and lubricate the linkage first, then the mixer. Standby sets run light for long stretches build up wet-stack deposits in the exhaust and combustion chamber; load the set above half rating to burn them off. Charging-circuit wear, alternator and regulator, is the most common electrical complaint.

Overhaul & Rebuild Points

Deposit buildup on valve faces, guides, and the exhaust port is the recurring finding when this engine comes apart, more a byproduct of combustion and oil carryover than a design flaw. A spark plug fouling early or one cylinder trending down on compression signals a valve job is due before a seat burns. Piston and rod groups come in low- and high-compression-ratio sets; match the rebuild kit to the original rating, not just the bore. On turbocharged-aftercooled units, inspect the turbocharger cartridge and aftercooler core for scale or leakage.

Seasonal & Environment Servicing

Sites running outdoors or unheated need the factory jacket-water heater working before cold weather hits; a cold start that never reaches operating temperature promotes wet stacking and hard starting. Check the fuel gas supply for moisture or liquid dropout in cold weather, since it upsets the air-fuel mixture at the mixer. In dusty oilfield or hot-climate installations, inspect and clean the radiator core routinely; packed fins are the leading cause of high jacket-water temperature shutdowns. Confirm the correct high-ambient radiator core is fitted for desert or summer sites.

G3306 common service parts

Part numberPart
4P-4719Filter Element-FuelCheck fitment →
9Y-5037Filter As-RfiCheck fitment →
9Y-0968Kit-Rfi FilterCheck fitment →

Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.

G3306 fault codes & troubleshooting

CodeMeaningLikely causeWhat to do
100-01 (CID 100 / FMI 01)Engine oil pressure reading below the normal operating range.Low oil level, worn oil pump, plugged oil filter, or a faulty oil pressure sensor or its wiring.Shut the engine down, check crankcase oil level and filter condition, and verify sensor wiring before restarting.
110-01 (CID 110 / FMI 01)Engine jacket-water temperature above the normal operating range.Low coolant level, restricted radiator or heat exchanger, failed thermostat, or weak water pump.Shut down, let the engine cool, check coolant level and flow, and inspect the thermostat and cooling circuit before restarting.
190-00 (CID 190 / FMI 00)Engine speed above the normal or rated operating range (overspeed).Governor malfunction, fuel gas control valve stuck open, or sudden loss of load on a generator set.Stop the engine, inspect governor linkage and the gas control valve, and confirm load conditions before restarting.
190-08 (CID 190 / FMI 08)Abnormal or lost signal from the engine speed (magnetic pickup) sensor.Damaged pickup, incorrect sensor air gap, broken wiring, or debris on the flywheel ring gear.Check pickup gap and wiring continuity, reset the gap to specification, and replace the sensor if the signal stays erratic.
168-02 (CID 168 / FMI 02)Battery or charging-system voltage reading erratic or out of range.Weak or failing battery, loose or corroded connections, or a faulty charging alternator or voltage regulator.Load-test the battery, clean and tighten connections, and check charging output at the alternator.
Overcrank / Failure-to-Start shutdownEngine failed to reach running speed within the allowed cranking attempts.No fuel gas pressure at start, weak ignition spark, low cranking speed, or governor set too lean for starting.Verify gas supply pressure and starting fuel setting, check battery and cranking motor condition, and confirm ignition spark before re-attempting a start.
Low Fuel (Gas) Pressure shutdownFuel gas supply pressure to the carburetor or mixer dropped below the set minimum.Upstream regulator fault, closed or restricted fuel valve, or a supply-line blockage.Check gas supply pressure at the regulator, inspect fuel valves and lines, and reset the panel once pressure is restored.
Emergency Stop (E-Stop) shutdownThe remote or local emergency-stop circuit tripped, cutting ignition and fuel to shut the engine down.E-stop button pressed, a tripped safety switch elsewhere in the loop, or a broken/open E-stop wiring circuit.Confirm no genuine emergency exists, reset the E-stop button, check the E-stop loop wiring, then reset the control panel.

Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.

G3306 attachments & work tools

Factory drive configuration

The G3306 industrial gas engine is built for three main duty types: generator-set drive (coupled to an AC generator end for prime or continuous electrical power), mechanical/compressor drive (gas gathering, gas lift, and wellhead gas compression), and pump drive (irrigation and other stationary pumping duty). Rated output for these builds runs roughly 108-157 bkW (145-211 bhp) at 1800 rpm depending on aspiration and duty class.

Aspiration and power arrangements

Offered as naturally aspirated (NA), turbocharged-aftercooled (TA), and turbocharged with aftercooling in higher-output form (TAA). NA builds rate near 108 bkW (145 bhp); TA/TAA builds reach roughly 151-157 bkW (203-211 bhp) at the same 1800 rpm rated speed. Aspiration choice sets the continuous power class available for a given generator or compressor package; figures vary by series and duty rating.

Coupling and flywheel housing

Commonly built with an SAE No. 1 flywheel and flywheel housing for direct coupling to a generator end or compressor drive through a flexible coupling disc rather than a torque converter. This housing size is consistent across the genset and mechanical-drive builds of this engine.

Cooling package options

Available with an engine-driven radiator on an open skid for self-contained generator-set packages, or with a remote-mounted radiator/heat exchanger arrangement for compressor or pump-drive installations where the engine and driven unit sit on separate skids. High-ambient radiator cores are offered for hot-climate oilfield sites.

Control panel and governor options

Base G3306 generator sets used a mechanical or hydra-mechanical governor as standard equipment, with pneumatic, electric-actuator, or electronic governors offered as options for tighter speed and frequency control. Panel options range from basic analog gauge panels to digital control panels with metering, protection, and alarm/event annunciation; a later, separately-marketed mechanical-drive variant of this engine family uses its own integrated electronic engine-management system, which is not part of the base G3306 option list.

Enclosure and mounting options

Generator-set packages are offered open-skid or in a factory enclosure: a sound-attenuated weatherproof enclosure for noise-sensitive sites, or a lower-cost weather enclosure with large ventilation openings for high-ambient, less noise-critical locations. Both enclosure styles keep the control panel visible and provide external emergency-stop access.

Cold-weather and starting aid options

A factory-installed jacket water heater is offered to preheat engine coolant for cold-start capability in outdoor or unheated installations. This is typically paired with a block/thermostat-controlled circuit that limits output temperature within safe operating limits.

All G3306 assemblies by section

Every catalogued assembly group for the Caterpillar G3306. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.

Air Inlet And Exhaust System
6n3745 Aftercooler Group
7n6108 Air Cleaner Gp
7n4357 Air Cleaner Group-Type 2
8n5252 Air Cleaner Gp
6n3685 Air Cleaner Group
7n4357 Air Cleaner Group-Type 1
6n9148 Air Cleaner Cap Group
5l8091 Air Cleaner Cap Group
5L***91Cap Group-Air Cleaner; Air Cleaner Cap Group1
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7n9568 Turbocharger Cartridge Group
1w9759 Turbocharger Cartridge Group*R
2n3324 Gauge Group-Air Cleaner
7c1890 Lines Gp-Air
8n0924 Turbocharger Oil Lines Group
8n6107 Turbocharger Oil Lines Group
8n4572 Lines Gp-Turbocharger Oil
8N***72Lines Group-Turbocharger Oil; Turbocharger Oil Lines Group1
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2w0806 Turbocharger Oil Lines Group
1n4191 Manifold Gp-Exhaust-Watercooled
1n4187 Manifold Gp-Exhaust-Watercooled
7n7469 Watercooled Exhaust Manifold Group
7N***69Manifold Group-Water Cooled Exh1
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8n0862 Watercooled Exhaust Manifold Group
8N***62Manifold Group-Water Cooled Exh1
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7n4042 Watercooled Exhaust Manifold Group
7N***42Manifold Group-Water Cooled Exh1
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8n0861 Watercooled Exhaust Manifold Gp
8N***61Manifold Group-Water Cooled Exh1
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7s7810 Regulator As
1p6082 Turbocharger Gp*R
7c1888 Turbocharger Gp
7n6138 Turbocharger Group
1w9266 Turbocharger Group-Field Changeover
1w9265 Turbocharger Group-Field Changeover
1w9757 Turbocharger Group*R
2w0807 Turbocharger Group
7n6111 Turbocharger Group
7l0369 Exhaust Elbow Group-102mm-4 In
2n1273 Exhaust Elbow Group-90 Degree Bend-127mm-5 In
7l0443 Exhaust Elbow Group-90 Degree Bend-102mm-4 In
5l7661 Elbow Gp-Exhaust-127mm-5 In
5L***61Elbow Group-Exhaust; Exhaust Elbow Group1
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4n4686 Blower Fan Group-660mm 26 In
4n2569 Blower Fan Group-33"
4n4685 Suction Fan Group-660mm-26 In
3n3016 Vertical Exhaust Fitting Group-127mm-5 In
3n3014 Vertical Exhaust Fitting Group-102mm-4 In
2w7845 Exhaust Fitting Group-Flexible-102mm-4 In
5l9377 Exhaust Fitting Group-127mm-5 In
5L***77Fitting Group-Exhaust; Exhaust Flange Group1
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2w7846 Exhaust Fitting Group-127mm-5 In
2W***46Fitting Group-Exhaust; -Flexible1
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2w7854 Exhaust Flange Gp
5l8592 Exhaust Flange Group-102mm-4 In
1w8823 Exhaust Flange Group
2w7857 Exhaust Flange Group-127mm-5 In-2 Required
2w7850 Exhaust Flange Gp-127mm-5 In
5l8649 Exhaust Pipe Group-102mm-4 In
5l8632 Exhaust Pipe Group-127mm-5 In
Basic Engine
7n4314 Front Housing Cover Group
3n2891 Valve Mechanism Cover Group
3N***91Cover Group-Valve Mechanism; Valve Mechanism Cover Group1
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7w7540 Cover Gp-Valve Mechanism
8n4745 Cover Gp-Valve Mechanism
8N***45Cover Group-Valve Mechanism; Valve Mechanism Cover Group1
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9y2288 Cover Gp-Valve Mechanism
4n7693 Crankshaft Assemblyfield Installatio*R
2w7458 Crankshaft As*R
Crankshaft Bearing Replacements
8N***25Bearing (1.25mm Undersize)7
8N***26Bearing (0.51mm Undersize)7
8N***27Bearing (0.76mm Undersize)7
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Crankshaft Service Thrust Plate-Field Installation
9y2638 Cylinder Head As
6i2402 Cylinder Head Gp
8n4800 Cylinder Head Group
7n4049 Cylinder Head Group
7e1285 Cylinder Head Gp
9y7896 Cylinder Head Gp
9y3640 Cylinder Head Gp
7w7506 Cylinder Head Gp-*R
3n2885 Damper Group
7w7495 Fastener Gp-Cylinder Head
2p6546 Cylinder Head Fastener Gp
2P***46Fastener Group-Cylinder Head; Cylinder Head Fastener Group1
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7n9536 Cylinder Head Fastener Gp
7N***36Fastener Group-Cylinder Head; Cylindetr Head Fastener Group1
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7n4137 Flywheel Gp
7n3821 Housing Gp-Front
7n3821 Front Housing Gp
8n0303 Housing Gp-Front
8N***03Housing Group-Front; Front Housing Group1
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6l1604 Indicator As-Vacuum
7n4312 Indicator Gp-Timing
1w5569 Engine Lifting Group
8n3157 Engine Lifting Group
8N***57Lifting Group; Engine Lifting Group1
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7n9122 Engine Lifting Group
7N***22Lifting Group; Engine Lifting Group1
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7l0472 Connecting Rod And Piston Group-10.5 : 1 Ratio
7L***72Piston & Rod Group; Connecting Rod & Piston Group1
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4p2699 Piston & Rod Gp-8 : 1 Ratio
8l4446 Connecting Rod And Piston Group-8 : 1 Ratio
8L***46Piston & Rod Group; Connecting Rod And Piston Group1
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7l0472 Connecting Rod & Piston Group-10.5 : 1 Ratio
7L***72Piston & Rod Group; Connecting Rod & Piston Group1
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4p2698 Piston & Rod Gp-10.5 : 1 Ratio
1w5122 Engine Support Gp-Rear
7n1268 Engine Support Group-Rear
7w7494 Valve Mechanism Gp
4w9175 Valve Mechanism Gp
7w7493 Mechanism Gp-Valve
4w9174 Valve Mechanism Gp
7e1556 Valve Mechanism Gp
7c3795 Valve-Mechanism Gp
7n8026 Valve Mechanism Group
7N***26Valve Mechanism Group; Valve Mechanism Group1
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Vee Belt Set
3n2886 Seal Adapter Group
3N***86Adapter Group-Seal; -Crankshaft1
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3n2755 Fan Drive Belt Tightener Group
2p6202 Camshaft Group
2P***02Camshaft Group-Single; Single Camshaft Group1
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2p6517 Cylinder Block Cover Group
2P***17Cover Group-Cylinder Block; Cylinder Block Covers Group1
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7n1292 Cylinder Block Cover Group
7N***92Cover Group-Cylinder Block; Cylinder Block Cover Group1
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2p6530 Cylinder Head Cover Gp
2P***30Cover Group-Cylinder Head; Cylinder Head Cover Group1
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6n8079 Crankshaft Gp
6N***79Crankshaft Group; Crankshaft Group1
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2p6222 Crankshaft Group
2P***22Crankshaft Group; Crankshaft Group1
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2p8776 Cylinder Block Assembly
7n6550 Cylinder Block Assembly
1n3576 Cylinder Block Group-Field Installation
7n8016 Cylinder Block Group*R
7N***16Cylinder Block Group; Cylinder Block Group1
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2p6560 Cylinder Block Group*R
2P***60Cylinder Block Group; Cylinder Block Group1
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6n8124 Cylinder Block Assembly
8n5286 Cylinder Block Group*R
8N***86Cylinder Block Group; Cylinder Block Group1
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3n7019 Drive Gp-Fan
3n7210 Fan Drive Group
3n2887 Front Housing Fastener Group
3N***87Fastener Group-Front Housing; Front Housing Fastener Group1
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2p9642 Front Timing Gear Group
8n2395 Flywheel Housing Group
8N***95Housing Group-Flywheel; Flywheel Housing Group1
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7n1747 Flywheel Housing Group
7N***47Housing Group-Flywheel; Flywheel Housing Group1
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8n6273 Kit-Block Hardware-Field Installation
03***80Bolt 4.128 cm(1.625 In.) Long2
0S***85Bolt; 12.7 mm (1/2") Diameter X 38.1 mm (1 1/2") Length Generator To Engine2
0T***65Bolt--3/8" X 3 1/2"--Use As Required; Bolt 5t***56 Plate To Cover Gp 4n***723
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3n5627 Fan Pulley Group
3n7211 Fan Pulley Group
3n2884 Crankshaft Pulley Group
3N***84Pulley Group-Crankshaft; Crankshaft Pulley Group1
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3n6128 Crankshaft Pulley Group
3n5626 Pulley Gp-Fan
2p6224 Crankshaft Seal Group
2P***24Seal Group-Crankshaft; Crankshaft Seal Group1
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3n2883 Engine Support Group-Front
2p6526 Valve Mechanism Group
2P***26Valve-Mechanism Group; Valve Mechanism Group1
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Cooling System
5n2087 Fan Adapter Group
5n7147 Fan Adapter Group
5N***47Adapter Group-Fan; Fan Adaptor Gp (See Page 18)1
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6n5960 Aftercooler Group
7c9216 Housing & Regulator Gp
8n6234 Housing And Regulator Group
8n0889 Housing & Regulator Gp
7c7414 Housing & Regulator Gp
8n5481 Housing And Regulator Group
8n5482 Housing And Regulator Group
7c6665 Housing & Regulator Gp
3n3271 Housing And Regulator Group
3N***71Housing & Regulator Group; Housing And Regulator Group1
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8n1912 Separate Circuit Cooling Lines Group
7c8085 Line Gp-Vent
1018960 Lines Gp-Vent
2w6166 Water Lines Group-Turbocharger Vent
4w4569 Water Lines Group
4W***69Lines Group-Water; Water Lines Group1
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8n4112 Lines Gp-Water
8N***12Lines Group-Water; -Bypass Relief1
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4w1111 Water Lines Group-Type 2
2w0829 Water Lines Group-Turbocharger Vent
2B***04Clip (1.062" Long); (1/4 In Id Opening)3
2W***04Tube Assembly1
2W***29Lines Group-Water1
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4w1111 Water Lines Group-Type 1
2p7728 Water Lines Group-Elbow
2P***28Lines Group-Water; Water Lines Group (Elbow)1
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2w0805 Water Lines Group-Turbocharger-Type 1
2w0805 Water Lines Group-Turbocharger
7n6113 Water Lines Group
8n0713 Water Lines Group
8N***13Lines Group-Water; Water Lines Group1
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3n3914 Water Lines Group
3N***14Lines Group-Water; Water Lines Group1
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2w6779 Lines Gp-Water
6i4289 Mounting Gp-Jacket Water Heater
6I***89Mounting Group-Jacket Wtr Heater1
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5n1897 Auxiliary Pump Group
7n6109 Pump Gp-Auxiliary-Fresh Water
7N***09Pump Group-Auxiliary Fresh Water1
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2w8006 Pump Gp-Water
1w3057 Water Pump Group
8n4252 Water Pump Group-Type 1
7n6210 Water Pump Group
7n2510 Water Pump Group
8n4252 Water Pump Group-Type 4
8n4252 Water Pump Group-Type 3
2w8005 Water Pump Group
8n4252 Water Pump Group-Type 2
1w6603 Water Pump Group
8n1913 Water Pump Group
1w3056 Water Pump Group
8n5932 Radiator Group-Type 1
2w9742 Radiator Group
3n2790 Radiator Gp
3N***90Radiator Group; Plate-Serial Number (Engine)1
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8n8836 Radiator Gp
8n5932 Radiator Group-Type 2
2w9073 Radiator Gp
7c7977 Radiator Gp
7n9517 Radiator Group
8n8838 Radiator Group
4w2129 Regulator & Housing Group
4w2131 Regulator & Housing Group
4w2132 Housing & Regulator Gp
6i4290 Switch Gp
3n3269 Expansion Tank Group-Type 2
3n3269 Expansion Tank Group-Type 1
6n6082 Tank Gp-Expansion
3n5658 Adapter Gp-Fan
7w0255 Oil Filter Base Group
7w0255 Base Gp-Oil Filter
9n3659 Coolant Conditioner Gp
2p7738 Engine Oil Cooler Group
2P***38Cooler Group-Engine Oil; Engine Oil Cooler Group1
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7w0256 Filter Base & Engine Oil Cooler Group
7W***56Cooler Group-Filter Base & Eng Oil1
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7w0257 Cooler Gp-Filter Base & Engine Oil
7W***57Cooler Group-Filter Base & Eng Oil1
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3n4924 Expansion Tank Cover Group
4n2570 Suction Fan Group-33" (838 Mm)
1w1310 Coolant Filter Group
7n6935 Fan Guard Group
7e6247 Heater Gp-Jacket Water
3e0264 Switch As-Temperature
3E***64Switch Group-Temperature; -Coolant1
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Engine Arrangement
7c2586 Conversion Ar-Engine
1N***87Manifold Group-Exhaust1
1N***74Fumes Disposal Group1
1W***22Support Group-Engine1
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7n4359 Conversion Ar-Engine-Naturally Aspirated
1N***91Manifold Group-Exhaust1
1N***74Fumes Disposal Group1
1W***22Support Group-Engine1
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7n6106 Conversion Ar-Engine-Part 1 Of 2
1N***87Manifold Group-Exhaust1
1N***74Fumes Disposal Group1
1W***22Support Group-Engine1
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7n6106 Conversion Ar-Engine-Part 2 Of 2
2W***05Lines Group-Water1
2W***06Lines Group-Turbocharger Oil1
2W***07Turbocharger Group1
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7n6509 Engine Ar-Part 3 Of 3
1P***44Breather Group1
2P***84Pump Group-Engine Oil; Engine Oil Pump Group1
2P***05Lines Group-Engine Oil; Engine Oil Lines Group1
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7n6509 Engine Ar-Part 1 Of 3
1W***69Lifting Group1
2P***02Camshaft Group-Single; Single Camshaft Group1
2P***22Crankshaft Group; Crankshaft Group1
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7n4315 Engine Ar-Part 2 Of 3
1W***92Pan Group-Oil1
2P***26Valve-Mechanism Group; Valve Mechanism Group1
2P***42Gear Group-Front Timing1
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7n4315 Engine Ar-Part 3 Of 3
1P***44Breather Group1
2P***84Pump Group-Engine Oil; Engine Oil Pump Group1
2P***05Lines Group-Engine Oil; Engine Oil Lines Group1
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7n4315 Engine Ar-Part 1 Of 3
1W***69Lifting Group1
2P***02Camshaft Group-Single; Single Camshaft Group1
2P***22Crankshaft Group; Crankshaft Group1
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9y7892 Engine Ar-Part 2 Of 2
1W***92Pan Group-Oil1
2P***24Seal Group-Crankshaft; Crankshaft Seal Group1
2W***79Lines Group-Water1
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9y7892 Engine Ar-Part 1 Of 2
1P***44Breather Group1
2P***02Camshaft Group-Single; Single Camshaft Group1
2P***30Cover Group-Cylinder Head; Cylinder Head Cover Group1
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7n6509 Engine Ar-Part 2 Of 3
1W***92Pan Group-Oil1
2P***26Valve-Mechanism Group; Valve Mechanism Group1
2P***42Gear Group-Front Timing1
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9y7893 Engine Ar-Part 1 Of 2
1P***44Breather Group1
2P***02Camshaft Group-Single; Single Camshaft Group1
2P***30Cover Group-Cylinder Head; Cylinder Head Cover Group1
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9y7893 Engine Ar-Part 2 Of 2
1W***92Pan Group-Oil1
2P***24Seal Group-Crankshaft; Crankshaft Seal Group1
2W***79Lines Group-Water1
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Fuel System And Governor
7e1814 Carburetor As-Natural Gas
7n6508 Carburetor Assembly
7n5901 Carburetor Gp
7n5901 Carburetor Group
7n5902 Carburetor Gp
7n6107 Control Gp-Carburetor
7n4358 Control Gp-Carburetor
7n6110 Drive Gp-Accessory
8n2379 Governor Drive Group
1w8977 Governor Drive Group-Woodward-Psg
7n4360 Governor Drive Group
7n8369 Woodward Governor Drive Group-Psg
1w8977 Woodward Governor Drive Group-Psg
7w5383 Governor Drive Group-Woodward-Psg
7W***83Drive Group-Governor; -Woodward Psg1
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7n8354 Fastener Gp-Woodward Governor-Part 2 Of 2
7n8354 Fastener Gp-Woodward Governor-Part 1 Of 2
7n8341 Woodward Governor Fastener Group
9y1978 Fastener Gp-Woodward Governor
9Y***78Fastener Group-Woodward Governor1
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7n2375 Governor Gp-Part 1 Of 2
7n2375 Governor Gp-Part 2 Of 2
1w1632 Woodward Governor Group-Psg
1w1632 Woodward Governor Gp-Psg
4w6815 Governor Gp-Basic Woodward
9y1589 Governor Gp-Woodward-Part 1 Of 2
1w1634 Woodward Governor Group-Psg
8n2925 Woodward Governor Group-Psg
1w1634 Governor Gp-Woodward-Psg
1w1633 Woodward Governor Group-Psg
7n2055 Woodward Governor Group
9y1589 Governor Gp-Woodward-Part 2 Of 2
7n8431 Woodward Governor Group-Psg
2w8482 Regulator Gp-Gas Pressure
7c1889 Regulator Gp-Gas Pressure
7n6112 Gas Pressure Regulator Group
7n6238 Valve Gp-Boost Control
7n6226 Valve Gp-Boost Control
4n3831 Governor Control Group-Vernier And Positive Lock
4N***31Control Group-Governor; Governor Control Group1
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4n3829 Governor Control Group-Vernier And Positive Lock
4n3835 Governor Control Group-Positive Lock-L.H.
4n3830 Governor Control Group-Positive Lock
8n6670 Woodward Governor Switch Group
8N***70Switch Group-Woodward Governor; Woodward Governor Swtich Gp1
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Gauges And Accessories
Battery Chargers
7W***07Battery Charger; -12 Volt Dc For Use With Lead Acid Batteries Only0
7W***08Battery Charger; Battery Charger--24 Volt Dc0
7W***09Battery Charger; Battery Charger - 30 Volt Dc0
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7l7870 Battery Group
7c1900 Battery Gp-Maintenance Free
7c1899 Battery Gp-Maintenance Free
7c1976 Battery Gp-Low Maintenance
7c1977 Battery Gp-Low Maintenance
7l7867 Battery Group
2n6961 Clutch Assembly
3n9097 Clutch Group
4p3073 Clutch Gp
2w4902 Clutch Group
2w4906 Clutch Gp-Part 1 Of 2
2w4906 Clutch Gp-Part 2 Of 2
2w4906 Clutch Group-Part 2 Of 2
2n7078 Clutch Assembly
2w4906 Clutch Group-Part 1 Of 2
2r6914 Flywheel Clutch Group
4n5675 Tachometer Drive Group-Dual
4n1402 Tachometer Drive Group-Single
4N***02Drive Group-Tachometer; Tachometer Drive Group-Single1
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2n6741 Tachometer Drive Group-Dual
1w7981 Indicator Group
8n3747 Service Meter Group
6l5757 Instrument Panel Group
1n7279 Instrument Panel Group
2w5994 Instrument Panel Group
1n7279 Instrument Panel Gp
3n9098 Rear Power Take-Off Group-Clutch
4p3074 Power Take-Off Gp-Rear-Clutch
4P***74Power Take-Off Group-Rear; -Clutch1
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2w4903 Rear Power Take-Off Group-Clutch
2w4907 Power Take-Off Gp-Rear
3n4128 Clutch Assembly
6l6468 Flywheel Clutch Group
3n5718 Holder-Lamp
5n8757 Magnetic Pickup Group
5N***57Magnetic Pickup Group; Magnetic Pick-Up Group1
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7l4535 Tachometer Mounting Group
7L***35Mounting Group-Tachometer; Tachometer Mounting Group[[751
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6l2692 Stub Shaft Group-Rear Mounted
6L***92Shaft Group-Stub; -Rear Mounted1
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6l2691 Stub Shaft Group-Front Mounted
5n1933 Support Group-Power Take-Off-Clutch
5n1678 Support Gp-Power Take-Off
5n8753 Tachometer Gp-Electric
3n6871 Electric Tachometer Group
3N***71Tachometer Group-Electric; Tachometer Group1
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7e3157 Tachometer Gp-Electric
Generators
4p5396 Connection Gp-Electrical
7w0115 Generator Leads Connection Group
7W***15Connection Group-Generator Leads1
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7w0115 Connection Gp-Generator Leads
7W***15Connection Group-Generator Leads1
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7w0571 Connection Gp-Generator Leads
7W***71Connection Group-Generator Leads; Generator Leads Connection Group1
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7w0572 Connection Gp-Generator Leads
7W***72Connection Group-Generator Leads; Generator Leads Connection Group1
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7c1781 Connection Gp-Generator Leads
5P***75Washer-Hard; (10.2x22.5x3-mm Thk)(Shield To A/C)3
6V***01Nut; (3/8-16-Thd)(Plate To Rh And Lh Bracket As)2
7C***81Connection Group-Generator Leads1
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7w0574 Connections Gp-Generator Leads
7W***74Connection Group-Generator Leads1
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5n4123 Generator Leads Connection Group
5N***23Connection Group-Generator Leads; Generator Leads Connection Group1
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5n4124 Generator Leads Connection Group
5N***24Connection Group-Generator Leads; Generator Leads Connection Group1
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5n4125 Generator Leads Connection Group
5N***25Connection Group-Generator Leads1
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5n4126 Generator Leads Connection Group
5N***26Connection Group-Generator Leads1
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7c1846 Connection Gp-Generator Leads
5P***75Washer-Hard; (10.2x22.5x3-mm Thk)(Shield To A/C)3
7C***46Connection Group-Generator Leads1
8L***95Nut-Full; (Cadmium)2
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5n5049 Generator Arrangement
1W***48Plate-Serial Number On Upper R.H.Side Of1
1W***56Plate-Information (Generator)1
2K***19Drive Screw--For Mounting Name Plate6
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5n5046 Generator Arrangement
1W***48Plate-Serial Number On Upper R.H.Side Of1
1W***56Plate-Information (Generator)1
2K***19Drive Screw--For Mounting Name Plate6
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5n5061 Generator Arrangement
1W***48Plate-Serial Number On Upper R.H.Side Of1
1W***56Plate-Information (Generator)1
2K***19Drive Screw--For Mounting Name Plate6
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5n5051 Generator Arrangement
1W***48Plate-Serial Number On Upper R.H.Side Of1
1W***56Plate-Information (Generator)1
2K***19Drive Screw--For Mounting Name Plate6
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4w9659 Generator Ar
1W***48Plate-Serial Number On Upper R.H.Side Of1
4W***38Film - Earth Ground Symbol1
4W***31Generator Group1
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5n5059 Generator Arrangement
1W***48Plate-Serial Number On Upper R.H.Side Of1
1W***56Plate-Information (Generator)1
2K***19Drive Screw--For Mounting Name Plate6
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4w9658 Generator Arrangement
1W***48Plate-Serial Number On Upper R.H.Side Of1
2K***19Drive Screw--For Mounting Name Plate6
4W***28Generator Group1
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5n5047 Generator Arrangement
1W***48Plate-Serial Number On Upper R.H.Side Of1
1W***56Plate-Information (Generator)1
2K***19Drive Screw--For Mounting Name Plate6
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5n5034 Generator Arrangement
1W***48Plate-Serial Number On Upper R.H.Side Of1
1W***56Plate-Information (Generator)1
2K***19Drive Screw--For Mounting Name Plate6
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4w9657 Generator Arrangement
1W***48Plate-Serial Number On Upper R.H.Side Of1
2K***19Drive Screw--For Mounting Name Plate6
4W***25Generator Group1
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5n5050 Generator Arrangement
1W***48Plate-Serial Number On Upper R.H.Side Of1
1W***56Plate-Information (Generator)1
2K***19Drive Screw--For Mounting Name Plate6
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4w8968 Generator Ar
1W***48Plate-Serial Number On Upper R.H.Side Of1
4W***38Film - Earth Ground Symbol1
4W***30Generator Group1
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5n5060 Generator Arrangement
1W***48Plate-Serial Number On Upper R.H.Side Of1
1W***56Plate-Information (Generator)1
2K***19Drive Screw--For Mounting Name Plate6
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5n5048 Generator Arrangement
1W***48Plate-Serial Number On Upper R.H.Side Of1
1W***56Plate-Information (Generator)1
2K***19Drive Screw--For Mounting Name Plate6
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5n5035 Generator Arrangement
1W***48Plate-Serial Number On Upper R.H.Side Of1
1W***56Plate-Information (Generator)1
2K***19Drive Screw--For Mounting Name Plate6
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5n0015 Generator Group-3 Phase-End View-Part 2 Of 2
5n0063 Generator Group-3 Phase-End View-Part 2 Of 2
5n0017 Generator Group-3 Phase-End View-Part 2 Of 2
5n0003 Generator Gp-3 Phase-End View-Part 2 Of 2
5n0063 Generator Group-3 Phase-Side View-Part 1 Of 2
5n0002 Generator Group-3 Phase-End View-Part 2 Of 2
5n0016 Generator Group-3 Phase-Side View-Part 1 Of 2
4w7431 Generator Gp-3 Phase-Side View-Part 1 Of 2
5n0016 Generator Group-3 Phase-End View-Part 2 Of 2
5n0018 Generator Group-3 Phase-End View-Part 2 Of 2
5n0029 Generator Group-3 Phase-End View-Part 2 Of 2
5n0003 Generator Gp-3 Phase-Side View-Part 1 Of 2
5n0028 Generator Group-3 Phase-End View-Part 2 Of 2
5n0017 Generator Group-3 Phase-Side View-Part 1 Of 2
5n0019 Generator Group-3 Phase-End View-Part 2 Of 2
5n0063 Generator Gp-3 Phase-Side View-Part 1 Of 2
5n0015 Generator Group-3 Phase-Side View-Part 1 Of 2
5n0019 Generator Group-3 Phase-Side View-Part 1 Of 2
5n0029 Generator Group-3 Phase-Side View-Part 1 Of 2
5n0018 Generator Group-3 Phase-Side View-Part 1 Of 2
4w7431 Generator Gp-3 Phase-End View-Part 2 Of 2
4w7430 Generator Group-3 Phase-End View-Part 2 Of 2
5n0027 Generator Group-3 Phase-End View-Part 2 Of 2
5n0014 Generator Group-3 Phase-End View-Part 2 Of 2
4w7430 Generator Group-3 Phase-Side View-Part 1 Of 2
4w7430 Generator Gp-Part 2 Of 2
5n0027 Generator Group-3 Phase-Side View-Part 1 Of 2
5n0002 Generator Group-3 Phase-Side View-Part 1 Of 2
4w7431 Generator Gp-Part 2 Of 2
5n0014 Generator Group-3 Phase-Side View-Part 1 Of 2
5n0063 Generator Gp-3 Phase-End View-Part 2 Of 2
5n0014 Generator Group-3 Phase-Side View-Part 1 0f 2
5n0028 Generator Group-3 Phase-Side View-Part 1 Of 2
4w7430 Generator Gp-Part 1 Of 2
4w7431 Generator Gp-Part 1 Of 2
7c0555 Heater Kit-Space
7w9575 Kit-Space Heater
9y3845 Module As-Boost
7c2700 Module-Control
9y8400 Regulator As-Automatic Voltage
7c1600 Regulator As-Automatic Voltage
5n2657 Rotor Assembly
7w0744 Rotor As
5n8799 Rotor Assembly
5n8884 Rotor Assembly
5n8885 Rotor Assembly
5n2656 Rotor Assembly
5n2655 Rotor Assembly
9y3857 Transformer Gp-Current
7w1617 Transformer Gp-Current
7w1616 Transformer Gp-Current
7c6850 Transformer Gp-Current
Transformer-Current
5n3755 Accessory Plates And Decalcomania Group
0L***65Washer 20.5 mm(.812 In.)O. D.2
0S***66Bolt-Pulley To Crankshaft Adapter1
0S***88Bolt,Machine; Hose Assembly Mounting,Hose Assembly To Transmission,And To Torque Converter3
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3n6710 Box Gp-Extension Terminal-Rh Mounted
4w8145 Chart-Circuit Breaker-Part 1 Of 7
4w8145 Chart-Circuit Breaker-Part 3 Of 7
4w8145 Chart-Circuit Breaker-Part 4 Of 7
4w8145 Chart-Circuit Breaker-Part 5 Of 7
4w8145 Chart-Circuit Breaker-Part 7 Of 7
4w8145 Chart-Circuit Breaker Part 6 Of 7
4w8145 Chart-Circuit Breaker-Part 2 Of 7
4w7405 Connection Gp-Terminal Strip-Low Voltage
4W***05Connection Group-Terminal Strip1
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7w1690 Connection Gp-Terminal Strip-Delta
7W***90Connection Group-Terminal Strip1
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4w9994 Connection Gp-Terminal Strip
4W***94Connection Group-Terminal Strip1
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6l3916 Generator Drive Coupling Group
6L***16Coupling Group-Generator Drive; Generator Drive Coupling Gp1
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4w8378 Fastener Gp-Low Voltage
7w1688 Fastener Gp
4w8379 Fastener Gp-Low Voltage
7w1689 Fastener Gp
9y5037 Filter As
5n3379 Installation Ar-Generator
3H***68Bolt-- Bracket To Starting Engine Timing Gear Housing12
3L***98Shim; (0.8-mm Thk)(.8mm Thk)2
5N***79Installation Ar-Generator1
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9y0968 Kit-Filter-Rfi
2w1791 Pre-Alarm Module Group
4w8214 Circuit Breaker Mounting Group
4w8215 Mounting Gp-Circuit Breaker
7w0919 Mounting Gp-Control Panel
4w7609 Mounting Gp-Transformer-Current
5n6688 Accessory Plates And Decalcomania Group
1W***61Plate-Engine Information; (Generator)1
2K***19Drive Screw--For Mounting Name Plate4
3N***23Cable Assembly- Neutral Connection2
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5n6691 Accessory Plates And Decalcomania Group
0L***65Washer 20.5 mm(.812 In.)O. D.2
0S***66Bolt-Pulley To Crankshaft Adapter1
1A***06Bolt--Neutral Connection1
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4w5271 Regulator As-240 Volt
4w5270 Regulator Assembly
3n7748 Regulator Assembly
4w5269 Regulator Assembly
3n7751 Regulator Assembly
3N***51Regulator As; Circuit Breaker 125 Amperes1
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7c6979 Transformer As
7w0921 Wiring Gp-Shunt Trip
4B***74Washer (Required Only When Bosch Alternator Is Fitted)1
5P***76Terminal-Fork; (14-Ga To 16-Ga, No. 10 Screw)(14-16 Gauge-No. 10 Screw)2
5P***21Terminal; (14-Ga To 16-Ga, No. 6 Screw)(14-16 Ga No.6 Screw)2
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Lubrication System
4w6958 Oil Filter Group
8n1204 Fumes Disposal Gp
1n4874 Fumes Disposal Group
4w8538 Oil Level Gauge Gp
4W***38Gauge Group-Oil Level (Dipstick)1
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3n2898 Oil Level Gauge Group
3N***98Gauge Group-Oil Level (Dipstick); -Engine1
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7w0259 Engine Oil Lines Group
2p6105 Oil Lines Group
2P***05Lines Group-Engine Oil; Engine Oil Lines Group1
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7e0571 Lines Gp-Engine Oil
2p6105 Lines Gp-Engine Oil
2P***05Lines Group-Engine Oil; Engine Oil Lines Group1
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3n2899 Oil Pan Group
1w0592 Oil Pan Group
8n4457 Base Gp-Oil Filter
8N***57Base Group-Oil Filter; Base Group-Engine Oil Filter1
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1p4244 Breather Group
2p6855 Oil Filler Group
2p6475 Oil Filter Group
2P***75Filter Group-Engine Oil; Oil Filter Group (10z1 ~ 10z7023)1
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2p1784 Oil Pump Group
2P***84Pump Group-Engine Oil; Engine Oil Pump Group1
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7w4457 Pump Gp-Engine Oil-One Section Gear
7W***57Pump Group-Engine Oil; -1-Section Gear1
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6i1343 Pump Gp-Engine Oil-One Section Gear*R
6I***43Pump Group-Engine Oil; -1-Section Gear1
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2p1785 Oil Pump Group*R
7w4456 Engine Oil Pump Gp*R-One Section Gear
4w2448 Engine Oil Pump Group*R
4W***48Pump Group-Engine Oil; Pump Gp-Engine Oil Gear1
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9l5651 Engine Oil Pump
9L***51Pump Group-Engine Oil; Engine Oil Pump Group1
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4p4021 Pump Gp-Engine Oil-One Section Gear*R
6n2464 Oil Pump Group-One Section Gear
9l5651 Oil Pump Group
9L***51Pump Group-Engine Oil; Engine Oil Pump Group1
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7w4457 Engine Oil Pump Gp-One Section Gear
7W***57Pump Group-Engine Oil; -1-Section Gear1
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6n2642 Engine Oil Pump Group
0S***90Bolt; (3/8-16x2in)(Clip Thru Spacer To Bracket As)1
1P***46Washer-Hard; (10.2x35x6-mm Thk)1
4W***48Pump Group-Engine Oil; Pump Gp-Engine Oil Gear1
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4w2292 Engine Oil Pump Group-One Section Gear*R
Service Equipment And Supplies
Name Plates And Films
3L***26Plate-Information; (Compression Ratio)(Install On Lh Side Of Block)1
3N***90Plate Serial Number; On R.H. Rear Bank Of Cylinder Block As Viewed From Rear Of Engine1
4B***58Screw (Identification Plate) Mounting2
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8f9866 Grease Gun
9s7977 Hand Tool Group
Starting And Electrical System
3n8423 Contactor Group
3N***67Contactor Group; Oil Pressure And Water Temperature Contactor Group1
3N***23Contactor Group-Press & Temp1
3N***06Mounting Group-Contactor; Contactor Mounting Group1
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4w3283 Ignition Conversion Group
7n4313 Drive Gp-Magneto
4p4716 Filter Gp-Fuel
4P***16Filter Group-Fuel1
4P***19Filter Element-Fuel; (Gas)1
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7n2587 Magneto Drive Gear Group-Type 2
7N***87Gear Group-Magneto Drive; (14-Teeth)1
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7n2587 Magneto Drive Gear Group-Type 1
7N***87Gear Group-Magneto Drive; (14-Teeth)1
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9y6491 Ignition Gp-Gas Engine
9y6492 Ignition Gp-Gas Engine
7n3973 Ignition Group
2w6617 Ignition Gp-Gas Engine
8n2038 Ignition Gp
2w4872 Ignition Gp-Gas Engine
8n1858 Ignition Group-Solid State
7l3031 Magneto Assembly
7n9378 Magneto Group
7e8055 Magneto Gp-Solid State
2w3749 Magneto Drive Gear Group
9y6465 Magneto Gp
7w0784 Sender Gp-24 Volts
03***10Sender As-Pressure; (Oil Pressure)1
3B***21Bushing-Reducing; (.375in External Thread)1
4B***49Nut-Valve To Bracket; 3.18mm(.125in)Thk1
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3t6305 Starting Motor Gp-Electric
3T***05Starting Motor Group-Electric; Starting Motor Group (Robert Bosch)1
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9l3597 Electric Starting Motor Assembly-Part 2 Of 2
6v5227 Starting Motor Gp-Electric*R
10***52Starting Motor Group-Electric1
6V***27Starting Motor Group-Electric1
6V***37Starting Motor Group-Electric1
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6v5537 Motor Gp-Electric
9x4447 Starting Motor Gp-Electric
9X***47Starting Motor Group-Electric; Electric Starting Motor Group (Nippondenso)1
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8l5455 Motor Gp-Electric Starting
8l5455 Electric Starting Motor Gp
1068552 Motor Gp-Electric
4n3181 Starting Motor Gp-Electric
3T***05Starting Motor Group-Electric; Starting Motor Group (Robert Bosch)1
4N***81Starting Motor Group-Electric1
8C***51Starting Motor Group-Electric; Starting Motor Gp-Electric-Delco-Remy1
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7t0799 Starting Motor Gp-Electric
7t2265 Starting Motor Gp-Electric
7T***65Starting Motor Group-Electric; Starting Motor Gp-Electric-Bosch1
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3t2655 Starting Motor Gp-Electric-Part 2 Of 2*R
7t9254 Starting Motor Gp-Electric-Part 1 Of 2
3t2655 Starting Motor Gp-Electric*R
3T***55Starting Motor Group-Electric1
7T***65Starting Motor Group-Electric; Starting Motor Gp-Electric-Bosch1
7T***54Starting Motor Group-Electric1
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3t2655 Starting Motor Gp-Electric-Part 1 Of 2*R
1w5516 Electric Starting Motor Group
8c3648 Starting Motor Gp-Electric
8C***48Starting Motor Group-Electric; Starting Motor Gp-Electric-Delco-Remy1
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9l3597 Electric Starting Motor Assembly-Part 1 Of 2
7t9254 Starting Motor Gp-Electric-Part 2 Of 2
6v5538 Motor Gp-Electric
8c3651 Starting Motor Gp-Electric
8C***51Starting Motor Group-Electric; Starting Motor Gp-Electric-Delco-Remy1
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1n9306 Valve As-Safety Shut-Off-Gas
2n2342 Valve As-Solenoid
8c9600 Valve Gp-Solenoid
8C***00Valve Group-Solenoid; -Gas Shutoff1
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6i3548 Wiring Gp
2l9808 Wiring Group
1L***99Marker-(Wire Code)1
2L***57Terminal-Ring; (8-Ga, No. 10 Screw)10
2L***58Terminal (To Alternator Positionor A Terminal)2
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6i0741 Wiring Gp
0S***09Bolt (3/4") Filler Tube Assembly To Transfer Drive Case5
2L***50Terminal; (6 Gauge) 6.4mm(.25in)Screw1
2L***54Terminal-Ring; (6-Ga, 1/2-In Screw)2
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3l6655 Wiring Kit Group
1H***66Clip-Wire Provides Loose Parts2
1L***99Marker-(Wire Code)1
2L***52Terminal; (6-Ga, 3/8-In)(6 Gauge/9.53mm(.375in)Screw)1
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2n7759 Alternator As
2n6398 Alternator As
6t1395 Alternator Gp*R
1004510 Alternator Gp-Charging-24 Volt, 55 Ampere
3n2708 Alternator Gp
6t1396 Alternator Gp*R
3n2709 Alternator Gp
3n2707 Alternator Gp
3n2706 Alternator Gp
3n2707 Alternator Group
1004511 Alternator Gp-Charging-24 Volt, 35 Ampere
3n2706 Alternator Group
3n2709 Alternator Gp-12 Volt, 55 Ampere
3n6867 Contactor Gp-Oil Pressure And Water Temperature
3N***67Contactor Group; Oil Pressure And Water Temperature Contactor Group1
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7l7367 Contactor Gp-Over Speed
7L***67Contactor Group-Overspeed; (Mechanical)1
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3n6385 Overspeed Contactor Group
8m7892 Ammeter Gauge Group
1w1525 Belt Guard Group-Alternator
3n8806 Contactor Mounting Group
3N***06Mounting Group-Contactor; Contactor Mounting Group1
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7l6586 Solenoid Switch Assembly
3t5045 Solenoid Switch Assembly
3t3421 Solenoid Assembly
3t4704 Solenoid Assembly-24 Volt
7t8854 Solenoid Assembly
7t0798 Starting Motor Gp-Electric
3t2652 Starting Motor Gp-Electric*R
8c3647 Starting Motor Gp-Electric
8C***47Starting Motor Group; Starting Motor Group-Electric1
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3t2652 Electric Starting Motor Group*R
4n4370 Air Motor Group
4n5712 Motor Gp-Air Starting
7w9654 Motor Gp-Air Starting
7w9655 Motor Gp-Starting
1l5011 Regulating And Pressure Reducing Valve Group

G3306 serial number reference

The engine serial number plate on a G3306 is a separate metal tag riveted to the engine block itself (commonly near the fuel system side or the flywheel housing), distinct from any generator-set or skid dataplate bolted to the package frame. The serial number reads as a 3-character prefix followed by a 5-digit sequence, for example 4DL00123. The prefix identifies the specific build series or arrangement (plain industrial gas engine, truck engine, or generator set), so it is the prefix, not the bare G3306 model name, that a dealer or parts book uses to pull the correct arrangement and parts list.

PrefixIdentifies
07YG3306 gas engine (industrial)
09AG3306 gas engine (industrial)
3CZG3306 gas engine (industrial)
6AAG3306 gas engine (industrial)
G8MG3306 industrial engine
3CFG3306 gas engine (early range, naming overlaps predecessor)
G6XG3306 NA (naturally aspirated) industrial engine
4DLG3306 truck engine
CNRG3306 generator set
JCAG3306 generator set
HCCG3306 / G3306 NA / G3306TA generator set
R6SG3306 TA engine/generator

Frequently asked questions

What engine does the Caterpillar G3306 use?

The G3306 is the engine itself, not a machine fitted with one. It is Caterpillar's in-line 6-cylinder, 4-stroke, spark-ignited natural gas engine on the 3300 block, 10.5 L (638 cu in) displacement with a bore and stroke of about 121 mm x 152 mm (4.75 in x 6.0 in), built naturally aspirated or turbocharged-aftercooled. Compression ratio runs 8:1 on the low-compression rating and 10.5:1 on the high-compression rating. Ignition is a magneto/distributor system paired with a mechanical governor as standard; an electronic governor was offered as an option on the base engine.

What is the operating weight of the Caterpillar G3306?

As a bare industrial engine it has no operating weight in the machine sense. Net dry weight is about 948 kg (2090 lb), consistent across naturally aspirated and turbocharged-aftercooled builds. Packaged as a complete generator set with skid, radiator, and generator end, shipping weight runs roughly 1490-1600 kg (3285-3520 lb) depending on electrical output and cooling configuration.

What replaced the Caterpillar G3306?

For gas-compression and mechanical-drive duty, Caterpillar's documented successor on this platform is the G3306B, which adds ADEM A4 electronic ignition and governing plus factory air-fuel ratio control and catalyst hardware for emissions-compliant sites. No source documents a separate, non-B successor for the genset and pump-drive versions of the base G3306; those duty classes moved to electronically controlled gas engines along with the rest of the lineup.

What G3306 owners discuss

How does horsepower vary across different G3306 listings, and why?
The G3306 is Caterpillar's inline six-cylinder, four-stroke, spark-ignited natural gas engine on the 3300 block: 10.5 L (638 cu in) displacement, bore and stroke about 121 mm x 152 mm (4.75 in x 6.0 in), compression ratio varies by configuration, either 8:1 or 10.5:1. It ships naturally aspirated (NA) or turbocharged-aftercooled (TA), and the two are not close in output. NA settles around 108 bkW (145 bhp) at 1800 rpm. TA runs roughly 151-157 bkW (203-211 bhp) at the same speed. If two listings for the same engine show very different horsepower, check NA vs TA configuration before assuming a bad number.
The ignition looks old-fashioned, a distributor rather than electronic. Is that right for this engine?
Yes for the base G3306. It uses a magneto-type ignition system with a distributor and spark plugs, not an electronic control-module-based system. That changed with the later G3306B, which added electronic ignition and governing along with factory air-fuel ratio control and catalyst hardware for emissions-compliant sites, so don't assume base-engine ignition parts or behavior carry over to a G3306B. On the base engine, a rough idle or intermittent miss traces almost always to distributor cap, rotor, or plug-wire wear rather than an electronic fault. Because wrong ignition timing on a spark-ignited gas engine can push it into detonation and damage pistons or rings, have your dealer verify timing after any distributor or magneto service.
Are there common electrical or sensor failures reported on the G3306?
Fewer than you would expect from a modern gas engine. The base G3306 runs mechanical governing and magneto ignition, so there is no engine control module and no diagnostic fault code list to read; a unit showing zero codes is normal on this platform, not a sign the electronics are dead. What owners flag instead is ordinary charging-circuit wear (alternator and regulator) and magneto pickup or distributor contact wear over time. On units fitted with factory air-fuel ratio control and a catalyst for emissions-compliant service, a drifting oxygen sensor is the one sensor-type complaint that shows up, since it lets the fuel mixture wander rich or lean before anyone notices.
People mention wet stacking on these engines when used as standby generator sets. Does that apply here?
Yes, it is a known complaint on lightly loaded standby or backup sets built on this platform. Running well under about half of rated load for extended periods keeps cylinder and exhaust temperatures too low to burn off unburned fuel and lube residue, and it condenses in the exhaust path and combustion chamber as a wet, carbon-laden buildup. The common fix reported is to periodically load the set above roughly half its rating to raise temperatures and burn the deposits off, rather than let it idle along under light load indefinitely.
What typically causes surging or hunting RPM on these units?
Two causes account for most reports: a governor with worn or dirty linkage, which overshoots and corrects in a repeating cycle, and a gas mixer with a dirty or varnished low-speed (idle) circuit. Both produce the same symptom, a rhythmic rise and fall in speed under steady load. The usual order of attack is to clean and lubricate the governor linkage first, then pull and clean the mixer's idle circuit if hunting continues. If surging persists after both, look upstream at the fuel gas pressure regulator rather than the engine itself.
What is the typical internal wear pattern owners watch for on this engine?
Deposit buildup on valve faces, valve guides, and the exhaust port area of the head is the recurring finding on teardown reports for this engine family, tied to combustion byproducts and oil carryover more than any single design fault. Left unchecked, flaked deposits can lodge between a valve and its seat, open a leak path, and burn or gutter the valve edge. A spark plug with heavy dry deposits, or a cylinder trending down on a compression or cylinder-pressure check, are the early tells that a top-end inspection is due before it turns into a valve job.
What should I check before buying a used G3306?
Confirm NA vs TA configuration first, since it sets the real rated output and which parts fit. Get actual running hours and any oil and coolant sampling history rather than a verbal estimate. Pull a spark plug and read its color and deposit pattern for a lean, rich, or oil-fouling clue, and get a compression or cylinder-pressure check if the seller allows it. Check the distributor cap, rotor, and plug wires for wear; these are normal service items on this platform, not defects. Confirm the governor, gas train, and, if the unit was set up for emissions-compliant service, the air-fuel ratio control and catalyst hardware are still with it, since engines pulled off a skid are often sold stripped of their control package. Inspect the radiator core for packed dust or debris and any sign of past overheating such as a weeping head gasket. Have your dealer verify compression and ignition timing against factory spec before you close the deal.

Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.

Serial-range & configuration variants

This page covers the Caterpillar G3306. Related factory variants of the same model family:

G3306G3306

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