Caterpillarengine - industrialgas engine
Caterpillar G343
Maintenance schedule, common problems & OEM parts breakdown
The Caterpillar G343 is a vintage spark-ignited natural gas industrial engine, not a mobile machine — it has no undercarriage, chassis, or travel drivetrain. Built on Caterpillar's 300-series inline six-cylinder block shared with the diesel D342, D343, and D353 family, it was produced from the 1960s into the 1970s, ahead of any electronic engine control. Caterpillar offered it naturally aspirated and as the turbocharged-aftercooled G343 TA, with an optional dual-fuel setup (natural gas plus propane or digester gas) added through an accessory gas-pressure regulator. A hydraulic Woodward-type governor was standard, with an electric load-sharing governor optional; start was 24V electric standard, with an air-start motor optional; cooling was by radiator or heat exchanger depending on the installation. As a generator-set prime mover, the TA configuration carries a documented continuous rating of 250 kW (312.5 kVA) at 1800 rpm, 277/480V three-phase 60Hz; as a mechanical-drive engine, front PTO output was rated from 83 kW (111 hp) light duty down to 45 kW (61 hp) heavy duty depending on class. Caterpillar never published a general operating weight; it varied by configuration.
The main factory variation across the line was the step from naturally aspirated to TA: turbocharging and aftercooling raised continuous output and let the same block cover duty points a naturally aspirated unit could not reach, while the dual-fuel regulator option widened the engine into landfill and digester gas sites beyond straight pipeline gas. There was no later next-generation G343; Caterpillar's subsequent G3300, G3400, and G3600 families eventually took over the industrial and generator-set gas-engine role with electronic ignition and governing, but no source ties one specific named model to the G343 as its direct replacement. In the used and parts market today, the G343 survives mainly as a legacy prime mover on standby or continuous-duty gensets and mechanical-drive applications, valued for its mechanical simplicity (no ECM to fail) and for internal parts commonality with the far more common diesel D342/D343/D353 block family. Buyers and rebuilders should confirm NA vs TA configuration, ignition system status (original points/magneto or a capacitor-discharge retrofit), and duty class before pricing an overhaul.
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 G343 specifications
Engine
| Type | Spark-ignited natural gas industrial engine, built in naturally aspirated and turbocharged-aftercooled (TA) configurations. Dual-fuel setup (natural gas paired with vaporized propane, or natural gas paired with digester gas) was offered through an accessory gas-pressure regulator. |
| Model designation | G343 (naturally aspirated) and G343 TA (turbocharged-aftercooled). Parts-book numbering and era point to a 1960s-1970s vintage industrial engine line, ahead of the later G3300/G3400/G3600 gas engine families. |
| Cylinders / displacement / bore & stroke | Not documented in any source that ties the figures specifically to G343. Published bore/stroke/displacement numbers found online for similarly-numbered Caterpillar engines belong to a different (diesel) model and are not carried over here. Confirm against the engine dataplate or the factory parts/service manual. |
| Rated power (documented application) | On a TA-configured unit paired with a generator, continuous output is documented at 250 kW (312.5 kVA) at 1800 rpm. Actual rated output varies by aspiration (NA vs TA), fuel setup, and duty class — treat as one confirmed data point, not a universal rating. |
| Governor | Hydraulic (mechanical, Woodward-type) governor standard; an electric Woodward governor with load-sharing/remote control was offered for standby and paralleled generator-set duty. |
| Starting system | 24V electric starting standard; an air-starting motor system was also offered as an alternative. |
| Cooling | Offered with either a radiator or a heat-exchanger (raw-water) cooling circuit, the latter suited to enclosed or shipboard-adjacent installations. |
| Emissions tier | Not applicable — predates modern exhaust emissions certification; no tier rating published. |
Weights
| Operating / dry weight | Not published in available specification sources for this engine. Bare engine weight varies with the cooling package (radiator vs heat exchanger), generator drive, and PTO fitment. Confirm against the dataplate or dealer parts book. |
| Shipping weight | Not documented for this model. |
Dimensions
| Engine block length/width/height | Not published in available specification sources for this engine. |
| Mounting/skid footprint | Not documented; varies by installation package (front/rear support groups, generator or PTO drive arrangement) rather than a single fixed footprint. |
Performance
| Governed speed | 1800 rpm on documented 60 Hz generator-set applications. |
| Continuous genset rating (TA, documented unit) | 250 kW / 312.5 kVA at 277/480V, three-phase, 60 Hz, 0.8 power factor, continuous duty. |
| Front power take-off output by duty class (1:1 ratio, SAE standard rotation) | About 83 kW (111 hp) light duty, 74 kW (99 hp) intermediate duty, 65 kW (87 hp) normal duty, 45 kW (61 hp) heavy duty. |
| Load control | Standby and load-sharing governor control groups were offered, indicating suitability for single-unit standby power and multi-unit paralleled generator operation. |
Service capacities (summary)
| Fuel supply | Gaseous fuel (natural gas, with optional propane or digester-gas dual-fuel blending) delivered through a pressure regulator — no liquid fuel tank capacity applies. |
| Engine oil | Not documented in available specification sources for this exact model. Consult the operation and maintenance manual for the correct fill volume. |
| Cooling system | Not documented in available specification sources for this exact model; capacity depends on whether the unit is radiator-cooled or heat-exchanger cooled. |
| Lubricant requirement | Units running on processed natural gas call for engine oil with a low-ash additive package (sulfated ash at or below about 0.5%), consistent with gas-engine lubrication practice of this era. |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
G343 fluids & capacities
| System | Capacity | Recommended fluid |
|---|---|---|
| Engine crankcase (with filter) | 38–45 L (10–12 US gal), varies by oil pan/sump configuration | Cat Natural Gas Engine Oil (NGEO) — Advanced 40 or Ultra 40, SAE 40 for normal ambient (roughly 5–50°C / 41–122°F); SAE 30 acceptable in cooler ambient down to about 0°C (32°F). Monograde oil only — multigrade oils are not recommended for Cat gas engines of this type. |
| Cooling system | 45–68 L (12–17.5 US gal); range reflects differing cooling packages across this engine family (radiator, heat exchanger, or keel-cooled marine/genset builds) — confirm actual fill for your specific unit | Cat DEAC (Diesel Engine Antifreeze/Coolant), mixed 50/50 with clean, low-mineral-content water; protects to about -37°C (-34°F). Cat ELC (Extended Life Coolant) is an approved extended-service alternative for this engine family. |
| Fuel supply | Not applicable — gaseous fuel engine, no onboard liquid fuel tank; fed from an external natural gas source through a pressure regulator/gas train | Pipeline-quality natural gas meeting Cat's minimum fuel gas quality (methane number) requirement for this engine family. Confirm the exact fuel gas spec for your unit's rating with a Cat dealer. |
| Governor | Separate small oil reservoir on the hydraulic governor; exact fill quantity not documented in available sources for this configuration | Same monograde engine oil grade used in the crankcase, per Cat gas engine guidance. Verify exact quantity and change interval against the OMM or with a dealer. |
| Grease (spec only) | No total fill quantity specified — applied per grease point per the lubrication schedule, not filled to a capacity | Cat multipurpose extreme-pressure grease, NLGI 2 (e.g. Cat Advanced 3Moly or equivalent), for external linkage, governor linkage, and accessory grease points. |
Capacities are refill values from factory literature — always fill to the dipstick/sight gauge, not the number.
Caterpillar G343 maintenance schedule
| Service interval | Tasks |
|---|---|
| Every 50 h |
|
| Every 250 h |
|
| Every 500 h |
|
| Every 1,000 h |
|
| Every 2,000 h |
|
| Every 6,000 h |
|
| Every 12,000 h |
|
Servicing the G343 beyond the schedule
Predictive Maintenance & Fluid Analysis
Track crankcase condition with S·O·S analysis of the NGEO oil charge. Wear metals and TBN depletion flag ring blow-by and lean-mixture combustion before they become a bearing failure. Sample coolant (DEAC or ELC) for corrosion-inhibitor depletion and scale indicators on the radiator or heat exchanger. With no ECM on this engine, spark plug condition and exhaust color are the real diagnostic window. Log plug wear and color at every 250-hour inspection to catch a lean or rich mixture drift early, and trend cylinder compression at overhaul intervals.
Corrective & Common Repairs
Most in-service faults trace to the gas train or ignition system. A worn mixer venturi or failed regulator diaphragm causes lean surge or misfire; pitted points, a failing coil, or a faulty capacitor-discharge retrofit module causes hard starting and rough running. On TA units, boost leaks or a fouled aftercooler core quietly cut output. Governor linkage wear shows up as speed hunting under load. Mechanical shutdown contactors for oil pressure, water temperature, and overspeed drift out of calibration and trip falsely, so verify trip points before condemning a sensor.
Overhaul & Rebuild Points
Top-end overhaul centers on valve and seat reconditioning, since light continuous-duty standby loads build carbon deposits steadily on this spark-ignited block. Expect cylinder head resurfacing plus piston, ring, and liner inspection at the same visit. Bottom-end work follows main and rod bearing clearance trends from oil analysis, not a fixed hour count. The G343 shares block architecture with the diesel D342, D343, and D353 family, easing sourcing of internal machining and wear parts. On TA units, inspect the turbocharger and aftercooler separately from the long block.
Seasonal & Environment Servicing
Run SAE 30 NGEO instead of SAE 40 at cold sites per OEM guidance, protect the battery bank and air-start motor from cold-soak failure, and confirm DEAC or ELC coolant is mixed for the expected freeze point. Continuous-duty standby sites need heat exchanger or radiator scale monitored, since deposits build gradually under steady load and cut cooling margin. Drain moisture from the gas fuel line trap more often in humid climates. On landfill or digester-gas sites, service the air cleaner and gas strainer more often; trace gases accelerate wear.
G343 common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| 1S-9547 | Transfer | Lubrication service | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
G343 attachments & work tools
Generator set (genset) drive arrangement
Factory-built G343 TA arrangement paired with an AC generator end for prime/continuous power duty. Documented package size is in the 250 kW / 312.5 kVA class at 1800 rpm, 60 Hz, three-phase, 277/480V; exact kW rating, voltage, and generator-end brand vary by specific package built.
Aspiration / engine arrangement
Sold as a turbocharged, aftercooled (TA) arrangement. This is the factory configuration documented for gas-genset builds of this model; no other aspiration arrangement is confirmed for it.
Governor / control package
Fitted with a hydraulic-type mechanical governor for engine speed control, consistent with this engine's pre-electronic control generation. No electronic engine-control (ADEM-type) governor package is documented for this model.
Cooling arrangement
Documented factory build uses heat-exchanger (closed-loop) cooling, suited to indoor or enclosed genset installations rather than an open radiator-cooled package.
Air intake
Equipped with a dry-type air cleaner assembly with a service/restriction indicator switch, standard for this engine class rather than an oil-bath cleaner.
Starting system
Standard factory starting arrangement is a 24-volt electric starter; no pneumatic starting option is documented for this model.
Ignition and fuel gas train
Runs a spark-ignition system with dedicated ignition module hardware plus a gas pressure regulator ahead of the fuel mixer, matched to the plant gas supply. This ignition/gas-train equipment is application-matched at build, not a generic field-added kit.
Engine-to-driven-equipment coupling
Couples to its generator end through an SAE-style flywheel housing with an adapter (spacer) plate sized to the specific driven unit. Mounting hardware is matched per package rather than a single universal bolt pattern.
All G343 assemblies by section
Every catalogued assembly group for the Caterpillar G343. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Attachments
6n3685 Air Cleaner Group
| 6N***85 | Air Cleaner Group | 1 |
1n9969 Instrument Panel Group
| 1N***69 | Panel Group-Instrument | 1 |
1n7279 Instrument Panel Group
| 1N***79 | Panel Group-Instrument | 1 |
6l7054 Air Cleaner Cap Group
| 6L***54 | Air Cleaner Cap Group; Rain Cap Group Air Cleaner | 1 |
4n4368 Air Motor Group
| 4N***68 | Air Motor Group | 1 |
6l6789 Air Precleaner Group
| 6L***89 | Air Precleaner Group | 1 |
6n9550 Air Start Motor Assembly
| 6N***50 | Air Start Motor Assembly; Motor Assembly | 1 |
4n6509 Air Starting Motor Group--Type 2
| 4N***09 | Air Starting Motor Group | 1 |
6n9593 Air Starting Motor Group
| 3B***55 | Elbow | 1 |
| 3B***57 | Bushing-Reducing | 1 |
| 6N***50 | Air Start Motor Assembly; Motor Assembly | 1 |
4n6509 Air Starting Motor Group--Type 1
| 4N***09 | Air Starting Motor Group | 1 |
7l8249 Air Starting Motor Group--18 H.P.
| 7L***49 | Air Starting Motor Group; Air Starting Motor Group (18 H.P.) | 1 |
6n6608 Air Starting Motor Group
| 6N***08 | Air Starting Motor Group | 1 |
2n6397 Alternator Assembly--24 Volt, 35 Ampere
| 2N***97 | Alternator As; Alternator Assembly | 1 |
2n6398 Alternator Assembly--24 Volt, 35 Ampere
| 2N***98 | Alternator As | 1 |
3n5680 Alternator Group--24 Volt, 35 Ampere--Type 2
| 3N***80 | Alternator Group-Charging | 1 |
3n5680 Alternator Group--24 Volt, 35 Ampere
| 3N***80 | Alternator Group-Charging | 1 |
3n7719 Alternator Mounting Group--Type 2
| 3N***19 | Alternator Mounting Group | 1 |
3n7719 Alternator Mounting Group--Type 1
| 3N***19 | Alternator Mounting Group | 1 |
7l7871 Battery Group--24 Volt, 172 Ampere Hours
| 7L***71 | Battery Group; (24-Volt)(24-Volt) | 1 |
7l7870 Battery Group--24 Volt, 120 Ampere Hours
| 7L***70 | Battery Group | 1 |
7l7872 Battery Group--24 Volt, 220 Ampere Hours
| 7L***72 | Battery Group | 1 |
7l6486 Blower Fan And Drive Group
| 7L***86 | Blower Fan And Drive Group | 1 |
2n7512 Blower Fan Group--33"--6 Blade
| 2N***12 | Blower Fan Group | 1 |
3n6710 Extension Terminal Box Group
| 3N***10 | Box Group-Extension Terminal | 1 |
3n5567 Generator Connection Box Group
| 3N***67 | Box Group-Generator Connection | 1 |
5l8091 Air Cleaner Cap Group
| 5L***91 | Cap Group-Air Cleaner; Air Cleaner Cap Group | 1 |
6l7355 Carburetor Assembly--Low Btu
| 6L***55 | Carburetor As | 1 |
3n6600 Automatic Start-Stop Chart
| 3N***00 | Chart-Automatic Start-Stop | 1 |
7l7088 Clutch Assembly
| 7L***88 | Clutch Assembly | 1 |
2n6965 Clutch Group--Type 2
| 2N***65 | Clutch Group | 1 |
2n7075 Power Take-Off Clutch Assembly--Type 2
| 2N***75 | Clutch Group | 1 |
3n7840 Power Take-Off Clutch Group
| 3N***40 | Clutch Group | 1 |
2n7075 Power Take-Off Clutch Assembly--Type 1
| 2N***75 | Clutch Group | 1 |
2n6965 Clutch Group--Type 1
| 2N***65 | Clutch Group | 1 |
3n7840 Power Take-Off Clutch Group--Type 2
| 3N***40 | Clutch Group | 1 |
3n6526 Contactor Group--Oil Pressure And Water Temperature
| 3N***26 | Contactor Group; Contactor Group | 1 |
7l7367 Overspeed Safety Contactor Group
| 7L***67 | Contactor Group-Overspeed; (Mechanical) | 1 |
3n6385 Overspeed Safety Contactor Group
| 3N***85 | Contactor Group-Overspeed | 1 |
3n6531 Contactor Mounting Group--Type 2
| 3N***31 | Contactor Mounting Group | 1 |
3n6531 Contactor Mounting Group--Type 1
| 3N***31 | Contactor Mounting Group | 1 |
4n5358 Governor Control Group--120-208 Volts--Load Sharing
| 4N***58 | Control Group-Governor | 1 |
4n5326 Governor Control Group--Load Sharing
| 4N***26 | Control Group-Governor | 1 |
8l4444 Governor Control Group--Vernier And Positive Lock--Type 1
| 8L***44 | Control Group-Governor | 1 |
8l4444 Governor Control Group--Vernier And Positive Lock--Type 2
| 8L***44 | Control Group-Governor | 1 |
8l4443 Governor Control Group--Positive Lock
| 8L***43 | Control Group-Governor | 1 |
7n240 Governor Control Group--Standby
| 7N***40 | Control Group-Governor | 1 |
8l4445 Governor Control Group--Remote And Positive Lock
| 8L***45 | Control Group-Governor; Governor Control Group | 1 |
4n5325 Governor Control Group--Standby
| 4N***25 | Control Group-Governor; Governor Control Group | 1 |
7n241 Governor Control Group--Load Sharing
| 7N***41 | Control Group-Governor | 1 |
2n6222 Woodward Governor Assembly
| 2N***22 | Crankshaft Group | 1 |
7l447 Exhaust Elbow Group--90degrees Bend--6"
| 7L***47 | Elbow Group-Exhaust | 1 |
7l443 Exhaust Elbow Group--90degrees Bend--4"
| 7L***43 | Elbow Group-Exhaust | 1 |
3n746 Electric Starting Motor Group--24 Volt
| 3N***46 | Electric Starting Motor Group | 1 |
4l6149 Electric Starting Motor Group--24 Volt--Type 1
| 4L***49 | Electric Starting Motor Group | 1 |
4l6149 Electric Starting Motor Group--24 Volt--Type 2--Replaced By 6n5564 Shown On Page 46-4
| 4L***49 | Electric Starting Motor Group | 1 |
6n5564 Electric Starting Motor Group--24 Volt
| 6N***64 | Electric Starting Motor Group | 1 |
7l3084 Electric Tachometer Group--24 Or 32 Volt--
| 7L***84 | Electronic Tachometers; Electric Tachometer Group 24 Volt | 1 |
7l3083 Electric Tachometer Group--12 Volt--Replaced
| 5L***34 | Tachometer Assembly --12 Volt | 0 |
| 5L***52 | Sending Unit Assembly 12 Or 24 Volt | 0 |
| 7L***83 | Electronic Tachometers; Electric Tachometer Group 12 Volt | 1 |
5l1548 Enclosed Clutch Group
| 5L***48 | Enclosed Clutch Group | 1 |
5l1548 Enclosed Clutch Group--Type 2
| 5L***48 | Enclosed Clutch Group | 1 |
4l3614 Exhaust Fitting Group
| 4L***14 | Exhaust Fitting Group | 1 |
2n3193 Expansion Tank Group
| 2N***93 | Expansion Tank Group | 1 |
3n3014 Exhaust Fitting Group--Vertical--4"
| 3N***14 | Fitting Group-Exhaust | 1 |
3n3018 Exhaust Fitting Group--Vertical--6"
| 3N***18 | Fitting Group-Exhaust | 1 |
5l8592 Exhaust Flange Group--4"
| 5L***92 | Flange Group-Exhaust | 1 |
5l8601 Exhaust Flange Group--6"
| 5L***01 | Flange Group-Exhaust; Exhaust Flange Group | 1 |
1l9108 Flexible Fuel Lines Group
| 1L***08 | Flexible Fuel Lines | 1 |
3n7844 Front Power Take-Off Group--1 : 1 Ratio--S.A.E. Standard Engine
| 3N***44 | Front Power Take-Off Group | 1 |
1n7305 Front Power Take-Off Group--1 : 1 Ratio--Type 2
| 1N***05 | Front Power Take-Off Group | 1 |
3n7844 Front Power Take-Off Group--1 : 1 Ratio--Type 1
| 3N***44 | Front Power Take-Off Group | 1 |
1n7305 Front Power Take-Off Group--1 : 1 Ratio--Type 1
| 1N***05 | Front Power Take-Off Group | 1 |
3n1889 Front Support Group
| 3N***89 | Front Support Group | 1 |
3n7025 Gas Pressure Regulator Group--Dual Fuel
| 3N***25 | Gas Pressure Regulator Group | 1 |
5l9895 Instrument Group--Oil Pressure And Water Temperature--
| 5L***95 | Gauge Group; -Engine Oil Pressure, Water Temperature | 1 |
5l9894 Instrument Group--Oil Pressure And Water Temperature--12 Volt
| 5L***94 | Gauge Group; -Oil Pressure, Water Temperature | 1 |
4l2113 Generator Assembly
| 4L***13 | Generator | 1 |
5l6099 Generator Drive Coupling Group--Type 2
| 5L***99 | Generator Drive Coupling Group | 1 |
5l6099 Generator Drive Coupling Group
| 5L***99 | Generator Drive Coupling Group | 1 |
6l9412 Generator Group--24 Volt, 18 Ampere--Type 2--Replaced By 3n7719 And
| 6L***12 | Generator Group | 1 |
6l9412 Generator Group--24 Volt, 18 Ampere--Type 1
| 6L***12 | Generator Group | 1 |
3n7353 Generator Installation Arrangement
| 0S***85 | Bolt; 12.7 mm (1/2") Diameter X 38.1 mm (1 1/2") Length Generator To Engine | 16 |
| 0T***68 | Bolt,Machine; Tube Mounting And Tube To Junction Block Uoc:Bsv,Bsx | 1 |
| 2M***49 | Washer-Retainer To Fan Bracket Assembly | 16 |
4l7004 Generator Installation Arrangement
| 0S***70 | Cap Screw (5/8" Long) | 8 |
| 0S***85 | Bolt; 12.7 mm (1/2") Diameter X 38.1 mm (1 1/2") Length Generator To Engine | 16 |
| 1B***01 | Nut Generator Line Leads; Nut-Generator Line Leads | 8 |
4n5402 Governor Drive Group--Part 2 Of 2--Type 1
| 4N***02 | Governor Drive Group | 1 |
4n5402 Governor Drive Group--Part 1 Of 2--Type 1
| 4N***02 | Governor Drive Group | 1 |
4n5402 Governor Drive Group--Part 1 Of 2--Type 2
| 4N***02 | Governor Drive Group | 1 |
4n5402 Governor Drive Group--Part 2 Of 2--Type 2
| 4N***02 | Governor Drive Group | 1 |
3n7779 Stub Shaft Guard Group
| 3N***79 | Guard Group-Stub Shaft | 1 |
5l6442 Heat Exchanger Assembly
| 5L***42 | Heat Exchanger Assembly | 1 |
2r4840 Heat Exchanger Assembly
| 2R***40 | Heat Exchanger Assembly | 1 |
5l6443 Heat Exchanger Assembly
| 5L***43 | Heat Exchanger Assembly | 1 |
5l5975 Heat Exchanger Assembly
| 5L***75 | Heat Exchanger Assembly | 1 |
3n7992 Heat Exchanger Group--Sea Water
| 3N***92 | Heat Exchanger Group; Heat Exchanger Group High Capacity | 1 |
3n8777 Heat Exchanger Group--Sea Water
| 3N***77 | Heat Exchanger Group | 1 |
3n859 Junction Box Group
| 3N***59 | Junction Box Group; Junction Box Group | 1 |
3n857 Junction Box Group
| 3N***57 | Junction Box Group; Junction Box Group | 1 |
Mechanical Tachometers
| 5L***64 | Drive Group-Tachometer | 1 |
| 7L***35 | Mounting Group-Tachometer; Tachometer Mounting Group[[75 | 1 |
| 7L***20 | Adapter Assem. | 1 |
7l8424 Motor Assembly--Type 2--Replaced By 6n9593 Shown On Page 49b
| 7L***24 | Motor Assembly | 1 |
7l8424 Motor Assembly--Type 1--Replaced By 6n9593 Shown On Page 49b
| 7L***24 | Motor Assembly | 1 |
4n3350 Electric Starting Motor Group--Basic--Part 2 Of 2
| 4N***50 | Motor Group-Electric Starting | 1 |
4n3350 Electric Starting Motor Group--Basic--Part 1 Of 2
| 4N***50 | Motor Group-Electric Starting | 1 |
7l4535 Tachometer Mounting Group--Type 2
| 7L***35 | Mounting Group-Tachometer; Tachometer Mounting Group[[75 | 1 |
7l4535 Tachometer Mounting Group
| 7L***35 | Mounting Group-Tachometer; Tachometer Mounting Group[[75 | 1 |
2n7442 Naturally Aspirated Engine Conversion Arrangement--Part 2 Of 2
| 2N***42 | Naturally Aspirated Engine Conversion Arrangement | 1 |
2n7442 Naturally Aspirated Engine Conversion Group--Part 2 Of 2
| 2N***42 | Naturally Aspirated Engine Conversion Arrangement | 1 |
2n7442 Naturally Aspirated Engine Conversion Group--Part 1 Of 2--Type 2--Factory Installation
| 2N***42 | Naturally Aspirated Engine Conversion Arrangement | 1 |
2n7442 Naturally Aspirated Engine Conversion Arrangement--Part 1 Of 2
| 2N***42 | Naturally Aspirated Engine Conversion Arrangement | 1 |
5l8649 Exhaust Pipe Group--4"
| 5L***49 | Pipe Group-Exhaust | 1 |
4l5801 Exhaust Pipe Group--6"
| 4L***01 | Pipe Group-Exhaust | 1 |
1n7308 Power Take-Off Clutch Assembly
| 1N***08 | Power Take-Off Clutch Assembly | 1 |
2s5651 Precleaner Assembly
| 2S***51 | Precleaner As; -Air Cleaner | 1 |
5l7942 Air Precleaner Group--Full View
| 5L***42 | Precleaner Group; -Air Cleaner | 1 |
4l4673 Radiator Assembly
| 4L***73 | Radiator Assembly | 1 |
2n7541 Radiator Group - Type 1
| 2N***41 | Radiator Group | 1 |
2n7541 Radiator Group--Type 2
| 2N***41 | Radiator Group | 1 |
2n7541 Radiator Group--Type 3
| 2N***41 | Radiator Group | 1 |
3n1893 Rear Support Group
| 3N***93 | Rear Support Group | 1 |
4l6190 Safety Alarm Contactor Group--Type 3
| 4L***90 | Safety Alarm Contactor Group | 1 |
4l6190 Safety Alarm Contactor Group--Type 4
| 4L***90 | Safety Alarm Contactor Group | 1 |
4l6190 Safety Alarm Contactor Group--Type 2
| 4L***90 | Safety Alarm Contactor Group | 1 |
4l6190 Safety Alarm Contactor Group--Type 1
| 4L***90 | Safety Alarm Contactor Group | 1 |
2n8134 Safety Shut-Off Arrangement--Oil Pressure And Water Temperature
| 2L***65 | Terminal; (10-Ga To 12-Ga)(Relay Switch "C" & "B") | 6 |
| 2L***74 | Terminal; (14-Ga To 16-Ga, No. 6 Screw)(Water Temp Switch) | 4 |
| 2L***75 | Terminal; (14-Ga To 16-Ga, No. 8 Screw)(Relay Switch "B" & "S") | 21 |
6l2691 Stub Shaft Group--Front
| 6L***91 | Shaft Group-Stub | 1 |
6l2691 Stub Shaft Group--Front--Type 2
| 6L***91 | Shaft Group-Stub | 1 |
5l5353 Motor Assembly--24 Volt--Part 1 Of 2--Type 2
| 5L***53 | Starting Motor As | 1 |
5l5353 Motor Assembly--24 Volt--Part 2 Of 2--Type 2
| 5L***53 | Starting Motor As | 1 |
5l5353 Motor Assembly--24 Volt--Part 2 Of 2--Type 1
| 5L***53 | Starting Motor As | 1 |
5l5353 Motor Assembly--24 Volt--Part 1 Of 2--Type 1
| 5L***53 | Starting Motor As | 1 |
1n9461 Stub Shaft Group--Rear
| 1N***61 | Stub Shaft Group | 1 |
7l7422 Suction Fan And Drive Group
| 7L***22 | Suction Fan And Drive Group | 1 |
2n7559 Suction Fan And Drive Group--33"--6 Blade
| 2N***59 | Suction Fan And Drive Group | 1 |
6n5123 Solenoid Switch Assembly--24 Volt
| 6N***23 | Switch As-Solenoid | 1 |
4m1812 Solenoid Switch Assembly
| 4M***12 | Switch As-Solenoid | 1 |
4l2353 Electric Tachometer Group--Type 1
| 4L***53 | Tachometer Group-Electric; Electric Tachometer Group | 1 |
4l2353 Electric Tachometer Group--Type 2--Replaced By 3n6871 Shown On
| 4L***53 | Tachometer Group-Electric; Electric Tachometer Group | 1 |
3n6871 Electric Tachometer Group
| 3N***71 | Tachometer Group-Electric; Tachometer Group | 1 |
1l5010 Air Receiver Group
| 1L***10 | Tank Group-Air | 1 |
1l5011 Regulator And Pressure Reducing Valve Group
| 1L***11 | Valve Group-Starting Air | 1 |
5l8604 Vertical Exhaust Fitting Group--6"
| 5L***04 | Vertical Exhaust Fitting Group | 1 |
5l8602 Exhaust Fitting Group--Vertical--4"
| 5L***02 | Vertical Exhaust Fitting Group | 1 |
3l9921 Whistle Valve Assembly
| 3L***21 | Whistle Valve Assembly | 1 |
3l6655 Wiring Group
| 1H***66 | Clip-Wire Provides Loose Parts | 2 |
| 1L***99 | Marker-(Wire Code) | 1 |
| 2L***52 | Terminal; (6-Ga, 3/8-In)(6 Gauge/9.53mm(.375in)Screw) | 1 |
2l9808 Wiring Group
| 1L***99 | Marker-(Wire Code) | 1 |
| 2L***57 | Terminal-Ring; (8-Ga, No. 10 Screw) | 10 |
| 2L***58 | Terminal (To Alternator Positionor A Terminal) | 2 |
8l4849 Wiring Group
| 1H***18 | Grommet--Junction Box | 1 |
| 1H***66 | Clip-Wire Provides Loose Parts | 0 |
| 2H***43 | Marker (Wire Code) | 1 |
2n2130 Woodward Governor Group--Part 1 Of 2
| 2N***30 | Woodward Governor Group | 1 |
2n2130 Woodward Governor Group--Part 2 Of 2
| 2N***30 | Woodward Governor Group | 1 |
Engine
2n3324 Gauge Group--Air Cleaner
| 2N***24 | Gauge Group-Air Cleaner | 1 |
6l4104 Gas Pressure Regulator Assembly
| 6L***04 | Regulator As | 1 |
7s7810 Regulator Assembly
| 7S***10 | Regulator As | 1 |
Aftercooler
Air Cleaner (4n3775 N/S)
| 4N***75 | Air Cleaner | 1 |
4l4721 Air Cleaner Assembly
| 4L***21 | Air Cleaner As | 1 |
6l2935 Air Cleaner Group
| 6L***35 | Air Cleaner Group | 1 |
Auxiliary Water Lines (2n2156 N/S)
| 2N***56 | Auxiliary Water Lines | 1 |
Auxiliary Water Pump (8l8195 N/S)
| 8L***95 | Auxiliary Water Pump | 1 |
7l8446 Auxiliary Water Pump Assembly
| 7L***46 | Auxiliary Water Pump Assembly | 1 |
2n9047 Auxiliary Water Pump Assembly
| 2N***47 | Auxiliary Water Pump Assembly | 1 |
3n6937 Auxiliary Water Pump Assembly
| 3N***37 | Auxiliary Water Pump Assembly | 1 |
Breather And Oil Filler (1n7514 N/S)
| 1N***14 | Breather And Oil Filler; Breather And Oil Filler Group | 1 |
Camshaft Drive
Camshaft (9s737 N/S)
| 9S***37 | Camshaft Group; Camshaft Group | 1 |
7l8199 Carburetor And Linkage Group
| 7L***99 | Carburetor And Linkage Group | 1 |
6l3384 Carburetor Assembly
| 6L***84 | Carburetor As | 1 |
Connecting Rod And Piston--6 Required
8l4429 Crankshaft And Damper Group
| 8L***29 | Crankshaft And Damper; Crankshaft And Damper Group | 1 |
Crankshaft And Damper (3n2103 N/S)
| 3N***03 | Crankshaft And Damper | 1 |
Crankshaft And Damper (8l4429 N/S)
| 8L***29 | Crankshaft And Damper; Crankshaft And Damper Group | 1 |
Crankshaft Bearing Replacement
Crankshaft Bearing Replacement Groups
7n142 Crankshaft Seal Group--Front
| 7N***42 | Crankshaft Seal Group | 1 |
| 9J***10 | Sleeve | 1 |
| 9N***39 | Seal | 1 |
Cylinder Block And Covers (8l9328 N/S)--Side View--Part 1 Of 2
| 8L***28 | Cylinder Block And Covers | 1 |
Cylinder Block And Covers (8l9328 N/S)--End View--Part 2 Of 2
| 8L***28 | Cylinder Block And Covers | 1 |
Cylinder Block Assembly
Cylinder Head And Valve Mechanism (8l9411 N/S)--End View--Part 2 Of 2
| 8L***11 | Cylinder Head Group | 1 |
8l9411 Cylinder Head And Valve Mechanism Group--Top View--Part 1 Of 2
| 8L***11 | Cylinder Head Group | 1 |
Cylinder Head And Valve Mechanism (8l9411 N/S)--Top View--Part 1 Of 2
| 8L***11 | Cylinder Head Group | 1 |
8l9411 Cylinder Head And Valve Mechanism Group--End View--Part 2 Of 2
| 8L***11 | Cylinder Head Group | 1 |
Damper Guard
Support (4l3326 N/S)
| 4L***26 | Engine Support | 1 |
Exhaust Elbow (8l9653 N/S)
| 8L***53 | Exhaust Elbow | 1 |
9m3223 Oil Filter Group
| 9M***23 | Filter Group-Engine Oil; Oil Filter Group | 1 |
Flywheel
7l8196 Gas Pressure Regulator Group
| 7L***96 | Gas Pressure Regulator Group | 1 |
Gasket Kits
| 1P***04 | Engine Complete | 0 |
| 1P***05 | Valve Grinding | 0 |
| 1P***61 | Water Pump Auxiliary | 0 |
7l5762 Governor Group--Part 2 Of 2
| 7L***62 | Governor | 1 |
7l5762 Governor Group--Part 1 Of 2--Type 1
| 7L***62 | Governor | 1 |
Governor (7l5762 N/S)--Part 1 Of 2
| 7L***62 | Governor | 1 |
7l5762 Governor Group--Part 1 Of 2--Type 2
| 7L***62 | Governor | 1 |
7l5762 Governor Group--Part 2 Of 2--Type 2
| 7L***62 | Governor | 1 |
7l5762 Governor Group--Part 1 Of 2
| 7L***62 | Governor | 1 |
7l5762 Governor Group--Part 2 Of 2--Type 1
| 7L***62 | Governor | 1 |
Governor (7l5762 N/S)--Part 2 Of 2
| 7L***62 | Governor | 1 |
Governor Drive
7n5692 Cylinder Head Assembly
| 7N***92 | Head As | 1 |
Ignition System (8l8683 N/S)
| 8L***83 | Ignition System | 1 |
Ignition System Drive
Instrument Panel Shut-Off
Jacket Water Lines--Part 1 Of 2
Jacket Water Lines--Part 2 Of 2
Lifting Eye (6l3142 N/S)
| 6L***42 | Lifting Eye; Lifting Eye Group | 1 |
3n527 Magneto Group--Type 2
| 3N***27 | Magneto Group | 1 |
3n527 Magneto Group - Type 1
| 3N***27 | Magneto Group | 1 |
Oil Cooler (6l1692 N/S)
| 6L***92 | Oil Cooler Group; Engine Oil Cooler Group | 1 |
9m3202 Oil Filter Base Assembly--Top View
| 9M***02 | Oil Filter Base Assembly | 1 |
Oil Lines
4l3343 Oil Pan Group
| 4L***43 | Oil Pan; Oil Pan Group | 1 |
4l3346 Oil Pump And Drive Group
| 4L***46 | Oil Pump And Drive Group | 1 |
9s1195 Oil Pump Assembly
| 9S***95 | Oil Pump Assembly | 1 |
1n7337 Jacket Water Pump Group
| 1N***37 | Pump Group-Water; Water Pump And Drive Group | 1 |
3s7229 Service Meter Group
| 3S***29 | Service Meter Group | 1 |
Turbocharger And Mounting (7l8198 N/S)
| 7L***98 | Turbocharger And Mounting | 1 |
4n3774 Turbocharger And Mounting Group
| 4N***74 | Turbocharger And Mounting Group | 1 |
4n3499 Turbocharger And Mounting Group--Field Installation--Type 2
| 4N***99 | Turbocharger And Mounting Group | 1 |
4n3499 Turbocharger And Mounting Group--Field Installation - Type 1
| 4N***99 | Turbocharger And Mounting Group | 1 |
9s7533 Turbocharger Assembly
| 9S***33 | Turbocharger Assembly | 1 |
2p3864 Turbocharger Group
| 2P***64 | Turbocharger Group | 1 |
4n9548 Turbocharger Group
| 4N***48 | Turbocharger Group | 1 |
4n4018 Turbocharger Group
| 4N***18 | Turbocharger Group | 1 |
Water Cooled Exhaust Manifold (8l8898 N/S)
| 8L***98 | Water Cooled Exhaust Manifold | 1 |
Generators
3n1880 Exciter And Regulator Assembly--Part 2--Type 2
| 3N***80 | Exciter And Regulator Assembly | 1 |
2n7052 Exciter And Regulator Assembly--Part 2 Of 2--Type 1
| 2N***52 | Exciter And Regulator Assembly | 1 |
3n1880 Exciter And Regulator Assembly--Part 1--Type 2
| 3N***80 | Exciter And Regulator Assembly | 1 |
3n1880 Exciter And Regulator Assembly--Part 1 Of 2--Type 1
| 3N***80 | Exciter And Regulator Assembly | 1 |
2n7052 Exciter And Regulator Assembly--Part 2 Of 2--Type 2
| 2N***52 | Exciter And Regulator Assembly | 1 |
2n7052 Exciter And Regulator Assembly--Part 1 Of 2--Type 1
| 2N***52 | Exciter And Regulator Assembly | 1 |
2n7052 Exciter And Regulator Assembly--Part 1 Of 2--Type 2
| 2N***52 | Exciter And Regulator Assembly | 1 |
3n1880 Exciter And Regulator Assembly--Part 2 Of 2--Type 1
| 3N***80 | Exciter And Regulator Assembly | 1 |
8l59 Generator Assembly--3 Phase--Side View--Part 1 Of 2
| 8L***59 | Generator Assembly | 1 |
5n24 Generator Assembly--3 Phase--Side View-Part 1 Of 2
| 5N***24 | Generator Assembly | 1 |
8l59 Generator Assembly--3 Phase--Side View - Part 1 Of 2
| 8L***59 | Generator Assembly | 1 |
8l60 Generator Assembly--3 Phase--End View-Part 2 Of 2
| 8L***60 | Generator Assembly | 1 |
8l59 Generator Assembly--3 Phase--End View - Part 2 Of 2
| 8L***59 | Generator Assembly | 1 |
5n24 Generator Assembly--3 Phase--Side View--Part 1 Of 2
| 5N***24 | Generator Assembly | 1 |
5n24 Generator Assembly--3 Phase--End View - Part 2 Of 2
| 5N***24 | Generator Assembly | 1 |
5n23 Generator Assembly--3 Phase--Side View-Part 1 Of 2
| 5N***23 | Generator Assembly | 1 |
5n24 Generator Assembly--3 Phase--Side View - Part 1 Of 2
| 5N***24 | Generator Assembly | 1 |
5n23 Generator Assembly--3 Phase--Side View--Part 1 Of 2
| 5N***23 | Generator Assembly | 1 |
8l60 Generator Assembly--3 Phase--End View--Part 2 Of 2
| 8L***60 | Generator Assembly | 1 |
8l59 Generator Assembly--3 Phase--End View--Part 2 Of 2
| 8L***59 | Generator Assembly | 1 |
5n24 Generator Assembly--3 Phase--End View--Part 2 Of 2
| 5N***24 | Generator Assembly | 1 |
5n23 Generator Assembly--3 Phase--End View--Part 2 Of 2
| 5N***23 | Generator Assembly | 1 |
8l60 Generator Assembly--3 Phase--Side View-Part 1 Of 2
| 8L***60 | Generator Assembly | 1 |
5n23 Generator Assembly--3 Phase--End View-Part 2 Of 2
| 5N***23 | Generator Assembly | 1 |
8l60 Generator Assembly--3 Phase--Side View - Part 1 Of 2
| 8L***60 | Generator Assembly | 1 |
5n25 Generator Assembly--3 Phase--End View-Part 2 Of 2
| 5N***25 | Generator Group | 1 |
5n25 Generator Assembly--3 Phase--End View--Part 2 Of 2
| 5N***25 | Generator Group | 1 |
5n25 Generator Assembly--3 Phase--Side View--Part 1 Of 2
| 5N***25 | Generator Group | 1 |
5n25 Generator Assembly--3 Phase--Side View - Part 1 Of 2
| 5N***25 | Generator Group | 1 |
5n25 Generator Assembly--3 Phase--Side View-Part 1 Of 2
| 5N***25 | Generator Group | 1 |
8f9866 Grease Gun
| 8F***66 | Grease Gun As | 1 |
Name Plates And Transfers
| 1H***40 | Transfer; Safety On Dash Or Guards When Used | 1 |
| 1M***98 | Transfer; Filter Instructions On Oil Filter Cover | 1 |
| 1S***47 | Transfer; Crankcase Instructions On Oil Filter Or Open Space Near Oil Filter | 1 |
3n7748 Regulator Assembly
| 3N***48 | Regulator As | 1 |
3n7751 Regulator Assembly
| 3N***51 | Regulator As; Circuit Breaker 125 Amperes | 1 |
5n8 Regulator Assembly
| 5N***08 | Regulator As | 1 |
5n9 Regulator Assembly
| 5N***09 | Regulator Assembly | 1 |
3n6094 Exciter Modification Service Group
| 3N***94 | Resistor Group | 1 |
5n2660 Rotor Assembly
| 5N***60 | Rotor As | 1 |
3n9114 Rotor Assembly
| 3N***14 | Rotor Assembly | 1 |
3n1956 Rotor Assembly
| 3N***56 | Rotor Assembly | 1 |
3n6018 Rotor Assembly--Replaced By 3n9114 Shown On Page 84j-2
| 3N***18 | Rotor Assembly | 1 |
9s7977 Tool Group
| 9S***77 | Tool Group-Hand | 1 |
G343 serial number reference
The PIN plate sits on the engine block, typically on the flywheel housing or left side of the block. On a packaged generator set it may also be stamped on the skid or genset dataplate near the alternator serial. The prefix is the first 3 characters before the sequence digits; 97N followed by up to 5 numeric digits identifies a G343 gas engine build.
| Prefix | Identifies | Notes |
|---|---|---|
| 97N | G343 gas engine, all configurations (naturally aspirated and TA turbocharged-aftercooled genset builds share this prefix) | Only known serial prefix for the G343 industrial gas engine, covering 97N1-UP. Minor component-level breakpoints inside the range (turbocharger change around 97N245/246, air cleaner assembly change around 97N296/297) mark parts updates, not a new prefix. Serial 97N389 identifies a TA-configured 250 kW generator set. Engine block is a gas-fueled derivative of the D343 diesel block, part of a shared Caterpillar diesel/gas industrial engine family (D330/D343/D379/D398/D399 diesel paired with G330/G343/G379/G398/G399 gas variants) that share cylinder kits and other core components across the line. |
Frequently asked questions
What engine powers the Caterpillar G343?
The G343 is itself an engine, not a machine with a separate powerplant. It is a spark-ignited natural gas industrial engine built on Caterpillar's 300-series inline six-cylinder block, related to the diesel D342, D343, and D353 family. Caterpillar offered it naturally aspirated and as the turbocharged-aftercooled G343 TA, with a dual-fuel option for propane or digester gas through an accessory gas-pressure regulator.
What is the operating weight of the Caterpillar G343?
Caterpillar never published a single operating weight for the G343 industrial engine. Weight varied by configuration (naturally aspirated vs TA), cooling method (radiator vs heat exchanger), and accessory package such as the generator end or air-start motor. It is best described qualitatively as a heavy industrial engine block rather than by one figure; treat any specific weight quoted without a documented source as unreliable.
What replaced the Caterpillar G343?
No single named model directly replaced the G343 in Caterpillar's lineup. It was a mechanical-governor, pre-electronic engine typical of the 1960s-70s. Caterpillar's later G3300, G3400, and G3600 gas engine families gradually superseded this generation of industrial gas engines with electronic ignition and governing and higher outputs, but no source ties one specific successor model directly to the G343 nameplate.
What G343 owners discuss
Owners report the engine's speed hunts or surges under load on the hydraulic governor — is the governor usually the culprit?
Rarely. Field experience on these mechanical hydraulic-governor units is that speed hunting almost always traces back to the fuel side, not the governor mechanism itself: a partially closed gas shutoff valve, a worn diaphragm in the fuel gas pressure regulator, or an air leak at the mixer/carburetor linkage will starve or flood the cylinders, and the governor just keeps chasing a setpoint it can't hold. Before condemning the governor, check supply gas pressure and regulator condition, then inspect the external governor-to-throttle linkage for slop, binding, or a fatigued return spring. Because speed instability under load can trip protective relays or stress a coupled generator, have your dealer verify governor and fuel-train adjustment on a running, loaded unit.
What's the practical difference operators notice between the naturally aspirated and TA (turbocharged-aftercooled) versions?
The TA variant is the one paired with the higher continuous output packages (units in the roughly 250 kW / 312.5 kVA, 1800 rpm, 60 Hz class, about 335 hp) that the naturally aspirated version of the same block can't reach. In practice that means the TA has an extra heat-rejection circuit through the aftercooler core in addition to jacket water cooling, so techs treat aftercooler fouling — on either the coolant or charge-air side — as its own maintenance item. A fouled aftercooler raises intake charge temperature, which eats into detonation margin at sustained full load.
These are old engines — what's the story with the ignition system on surviving units?
A number of running units have had their original points/magneto-type ignition replaced in the field with a modern capacitor-discharge retrofit ignition system, since factory ignition components on an engine this old are well past typical service life and electronic ignition is reported to hold timing more consistently and start easier in cold weather. When troubleshooting a rough-running or hard-starting unit, first confirm whether it still carries original ignition hardware or has already been converted — diagnostic steps and spare parts are completely different between the two setups. Ignition timing directly affects detonation margin on a gas engine, so have your dealer verify timing and ignition system health rather than adjusting it blind.
Why do these engines seem to foul spark plugs and build up carbon faster in standby/light-duty service?
Mechanics point to extended light-load running as the main driver of premature plug fouling and carbon buildup on valves and behind the piston rings — a gas engine runs richer at light load to hold stable combustion, and the extra unburned fuel leaves deposits. Plug and valve life varies a lot with load factor and fuel gas quality; units worked at a steady, more substantial load generally get longer plug and valve life than ones left idling or lightly loaded most of the time on standby duty. A rough exhaust note or unstable running is usually chased down by comparing exhaust port temperatures cylinder to cylinder before pulling plugs.
What cooling-system complaints come up on these units after years in service?
Whether the package is radiator-cooled or run through a heat exchanger, the recurring complaint is scale or sediment fouling on the water side after years of service, particularly where make-up water is hard or untreated — it shows up as jacket water temperature creeping up at the same load rather than a sudden failure. Operators also note that running for long periods at low load and low jacket-water temperature works against the engine, since it encourages the same carbon/valve-deposit issues seen with light-load duty cycles, so keeping jacket water in its designed operating range under real load is treated as routine good practice.
What electrical or starting problems come up most on a pre-electronic-control engine like this?
Since these engines predate any digital engine control, the electrical complaints that surface are almost all tied to the 24V DC starting circuit — weak or sulfated batteries, corroded battery cable terminals, and a worn starter solenoid are the most common reasons a unit won't crank or cranks slowly, especially after sitting idle on standby duty. On units where the ignition has been retrofitted to an electronic capacitor-discharge system, a failed ignition module or deteriorated shielded plug wiring is the next most common no-start or rough-run complaint once the basic starting circuit checks out fine.
What should a buyer check before purchasing a used G343 generator set?
Treat the hour meter with some skepticism and judge the engine mainly by top-end condition: compression and blow-by on each cylinder, any evidence of recent head or valve work, and whether carbon/valve-deposit condition is consistent with the claimed hours. Ask specifically whether the ignition system is still original or has been retrofitted, and ask for maintenance and run logs rather than relying on the meter alone. Inspect the fuel gas train — regulator, shutoff valves, flexible connections — and the cooling circuit (radiator or heat exchanger) for leaks, rust, and scale. A running load test before purchase is the best way to catch governor hunting, detonation tendencies, or cooling shortfalls that a static walk-around inspection will miss; have your dealer verify compression, ignition timing, and governor response under an actual load before finalizing a purchase.
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
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