Caterpillarengine - generator setgen set engine
Caterpillar G3412C
Maintenance schedule, common problems & OEM parts breakdown
The Cat G3412C is a stationary, skid-mounted natural gas generator set built around Caterpillar's V-12, 27.0 L spark-ignited gas engine (137 mm x 152 mm bore/stroke), part of the G3400 platform that also spans the 6-cylinder G3406, 8-cylinder G3408, and 16-cylinder G3416. It is turbocharged and aftercooled, and across its published rating packages produces roughly 350-512 ekW (438-640 kVA) at 0.8 power factor, offered in both 50 Hz/1,500 rpm and 60 Hz/1,800 rpm speed classes. Package dry/shipping weight runs about 6,360-6,500 kg (14,000-14,330 lb) depending on base width and rating, with enclosed or sound-attenuated versions weighing more than an open skid. Documented production runs from roughly the early 2000s to about 2010. Caterpillar offered it in open-skid, dropover-enclosure, and sound-attenuated configurations, in LE low-emission and standard/TA emissions packages, all fitted with Cat EMCP digital generator control and protection as standard.
The C-suffix marks a real generational step from the earlier plain G3412: Caterpillar moved from a mechanically governed, rich-burn engine to electronic ADEM-based governing paired with the Cat Electronic Ignition System and closed-loop, per-cylinder knock control for lean-burn combustion, a change that lowered emissions and improved fuel economy but also changed how the engine is diagnosed and serviced. Within the G3412C family itself, compression ratio, governor generation, and control-panel hardware (spanning EMCP II through EMCP 4.4) vary by build year and rating package, so two units badged the same way can differ under the skin - always match rating and emissions certification to the actual nameplate. Caterpillar kept extending the G3412 generator-set line after this C-suffix generation and later introduced the CG137-12 land production generator set as the modern oilfield-duty equivalent, though no single model formally superseded it. In the used and parts market the G3412C stays relevant because of a sizeable installed base still running oilfield, biogas, and standby power duty, and because its ignition, knock-sensor, and control-panel components are recurring wear items that keep steady demand for parts and qualified service work.
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 G3412C specifications
Engine
| Engine model | Cat G3412C, V-12, 4-stroke-cycle, spark-ignited natural gas, water-cooled |
| Gross engine output (bare engine, before fan/generator losses) | 272-475 bkW (365-637 bhp) at 1800 rpm, depending on rating package and duty class |
| Genset electrical output range | 350-512 ekW (438-640 kVA) at 0.8 power factor, spanning 50 Hz/1500 rpm and 60 Hz/1800 rpm packages; common packages are 360 kW (450 kVA) 50 Hz, and 375 ekW and 500 ekW 60 Hz |
| Displacement | 27.0 L (1649 cu in) |
| Bore x Stroke | 137 mm x 152 mm (5.4 in x 6.0 in) |
| Compression ratio | 8.5:1 to 11.4:1 - varies by rating package (higher ratio on 60 Hz/1800 rpm standby-duty packages, lower ratio seen on 50 Hz/1500 rpm and continuous-duty low-emission calibrations) |
| Aspiration | Turbocharged, aftercooled (separate-circuit aftercooler) |
| Governor | ADEM A4 electronic governor on later production packages; earlier packages used an electronic governor with a separate actuator paired with Cat EIS ignition - verify which applies to a given serial range with your dealer |
| Ignition system | Cat Electronic Ignition System (EIS) |
| Fuel system | Low-pressure natural gas carburetion with gas pressure regulator and air/fuel ratio control; typical engine fuel-control-valve pressure range is roughly 10-25 psig depending on rating |
| Emissions | Low-emission combustion calibration achieves as low as 1.9-2.0 g/bhp-hr NOx; standby packages are built to meet U.S. EPA stationary emergency requirements, continuous compression-duty ratings are built NSPS-compliant-capable with customer-supplied aftertreatment |
| Contamination note | G3412C is a distinct, more modern calibration of the G3400 platform from the plain G3412 gas petroleum engine (mechanical Woodward PSG governor, rich-burn combustion) and from the unrelated diesel 3412C/C13 generator sets - specs below are scoped to G3412C only |
Weights
| Genset package weight (open/skid-mounted, 375-500 ekW, 60 Hz) | approximately 6,360-6,410 kg (14,000-14,140 lb) dry/shipping weight |
| Genset package weight (512 ekW/640 kVA narrow-base listings) | approximately 6,500 kg (14,330 lb) - narrower-footprint base option, treat as a separate configuration from the wide-base 500 ekW package above |
| Enclosed/sound-attenuated packages | substantially heavier than open-skid weights above once the acoustic enclosure and integral fuel/oil containment are added - confirm with a build sheet for the specific enclosure |
| Low-emission gas-compression package (bare engine plus skid, no generator end) | approximately 6,170 kg (about 13,600 lb) |
Dimensions
| Genset package length (375-500 ekW, 60 Hz, open/skid) | 4,540-4,635 mm (178.7-182.5 in) |
| Genset package width | 2,104-2,238 mm (82.8-88.1 in) |
| Genset package height | 2,529-2,679 mm (99.6-105.5 in) |
| Narrow-base 512 ekW package (alternate configuration) | approximately 3,796 mm long x 1,854 mm wide x 2,163 mm high (149.5 x 73 x 85.2 in) |
| Gas-compression package footprint (bare engine, no generator/alternator end) | approximately 2,442 mm long x 1,598 mm wide x 1,960 mm high (96 x 63 x 77 in) |
| Note | package dimensions are for reference only per the factory sheets - do not use for installation design, confirm with certified general-arrangement drawings |
Performance
| Rated speed | 1,500 rpm (50 Hz) or 1,800 rpm (60 Hz) |
| Standby/continuous power range | 350-512 ekW (438-640 kVA) at 0.8 power factor across published rating packages |
| Fuel consumption at 100% load (500 ekW/625 kVA, 60 Hz package) | about 11.3 MJ/ekW-hr (10,694 Btu/ekW-hr) |
| Fuel consumption at 100% load (375 ekW package) | about 7.3 MJ/bhp-hr equivalent (6,887 Btu/bhp-hr, ISO 3046/1 basis) |
| Heat rejection to jacket water | approximately 367-457 kW at full load, depending on rating package |
| Motor starting capability at 30% voltage dip (375 ekW package) | approximately 928 skVA |
| Altitude capability without derate | approximately 610 m (2,000 ft) above sea level at 25 degC ambient for the 500 ekW package; consult altitude/temperature derate tables for other ratings and site conditions |
| Travel speed / drawbar / gradeability | not applicable - stationary generator set, no propulsion |
Service capacities (summary)
| Fuel | no onboard liquid fuel tank - runs on external natural gas supply; not applicable for tank capacity |
| Engine oil (lube system refill) | approximately 170 L (45 US gal) - documented for the low-emission compression-duty version of this engine block; expect a comparable sump size on the generator-set version since it shares the same block and pan |
| Cooling system (with radiator, 375 ekW genset package) | approximately 140 L (37 US gal) |
| Cooling system (engine-only, no full radiator package, compression-duty configurations) | approximately 55-76 L (14.5-20 US gal) - smaller because it excludes the generator-set radiator loop |
| Hydraulic system | not applicable - no hydraulic system on this engine or generator set |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
G3412C fluids & capacities
| System | Capacity | Recommended fluid |
|---|---|---|
| Engine crankcase (with oil filter) | Lube oil system refill: 170.3 L (45 US gal) | Cat NGEO (Natural Gas Engine Oil), SAE 40 single-grade only. Cat gas engines are not approved for multigrade automotive-type oils. Low-ash, anti-oxidation/anti-nitration formulation controls piston and cylinder-liner deposits, spark-plug fouling and valve wear on spark-ignited natural gas fuel. Do not substitute diesel engine oil (Cat DEO) or an unapproved gas-engine oil. |
| Cooling system | Engine-only jacket-water circuit (bare/compression-engine configuration, remote-cooled, no radiator): 54.9 L (14.5 US gal). Packaged generator-set version with factory radiator (verified on a 375 ekW, 60 Hz set): 140 L (37 US gal) engine coolant capacity. Radiator-equipped capacity varies with kVA rating and radiator size across the G3412C generator-set line. | Caterpillar coolant/antifreeze, listed as standard equipment on the generator-set cooling package; use a premixed ethylene-glycol/water coolant maintained to Cat's specification (extended-life type where fitted) rather than automotive antifreeze. Jacket-water outlet temperature runs up to about 99 degrees C (210 degrees F). The engine uses a separate-circuit aftercooler (SCAC), so the charge-air cooling loop is independent of the jacket-water loop; both circuits must be filled and treated to spec. |
| Fuel system | No onboard fuel tank. The engine is pipeline-fed: low-pressure natural gas supplied through a gas pressure regulator and an energize-to-run shutoff valve, at roughly 1.5 to 5.0 psig supply pressure. | Pipeline-quality natural gas, minimum Cat methane number about 80, with a lower heating value in the 905 to 920 Btu/scf range used for rating. Gas outside the specified methane number requires a power derate; check site gas composition against the Cat fuel usage guide before startup. |
| Transmission / powertrain compartment | Not applicable. The engine drives the AC generator directly through a close-coupled flywheel adapter; there is no gearbox, torque converter or powershift compartment on this generator-set configuration. | Not applicable. |
| Final drives | Not applicable. This is a stationary, skid-mounted generator set with no drivetrain or final drives. | Not applicable. |
| Hydraulic system and tank | Not applicable. Standard G3412C generator-set packages use electric starting and an electronic/mechanical governor; no hydraulic reservoir or circuit is part of this configuration. | Not applicable. |
| Axles / differentials | Not applicable. Stationary generator-set package, no axles or differentials. | Not applicable. |
| Grease | Spec only, no fill capacity published. Applied at generator bearing and linkage grease points on the scheduled service interval. | Cat Multipurpose Grease (NLGI 2, lithium-complex type), suited for roughly -30 to 40 degrees C (-22 to 104 degrees F) ambient service. Ask your dealer about a moly or premium high-temperature grease option for extreme cold or heavy bearing duty. |
Capacities are refill values from factory literature — always fill to the dipstick/sight gauge, not the number.
Caterpillar G3412C maintenance schedule
| Service interval | Tasks |
|---|---|
| Every 50 h |
|
| Every 250 h |
|
| Every 750 h |
|
| Every 1,500 h |
|
| Every 4,000 h |
|
| Every 8,000 h |
|
| Every 24,000 h |
|
Servicing the G3412C beyond the schedule
Predictive maintenance & fluid analysis
Run oil sampling on every 250-hour interval rather than trusting hours alone: G3412C's low-ash NGEO oil doesn't follow diesel TBN depletion curves, so watch the TAN/TBN crossover and rising silicon, lead, or copper trends instead. Pull coolant samples at the scheduled Level 1/Level 2 checkpoints to catch additive depletion before liner pitting starts. Log knock-sensor retard events and cylinder-balance readings at each PM visit - a slow efficiency drift usually shows in the data before it shows as a fault code.
Corrective & common repairs
Most field calls trace to the ignition and detonation-control side: prechamber spark plugs, ignition transformers, and per-cylinder knock sensors all age at different rates depending on fuel quality and load cycling. A single fouled plug or drifting knock sensor shows up as timing retard or an uneven exhaust note before power loss is obvious. EMCP and ECM communication faults are common and usually clear with a full battery disconnect and harness/connector check rather than a panel swap. Treat any timing or air-fuel adjustment as dealer-verified work.
Overhaul & rebuild points
Plan top-end work (heads, liners, pistons, rings) in the 9,000-12,000 hour range and a major in-frame overhaul around 18,000-24,000 hours, both varying with fuel quality and load factor. Track turbocharger shaft play and compressor-housing oil carryover as the leading indicator of bearing wear well before the scheduled inspection point. Rear-main and front-cover seepage on a high-hour block is common and not automatically disqualifying - distinguish cosmetic weeping from an active leak before committing to a teardown.
Seasonal & environment servicing
Site gas quality drives ignition-component life more than ambient temperature: confirm methane number and heating value against the Cat fuel usage guide before each seasonal changeover, since off-spec or mixed gas accelerates plug wear and knock-retard derates. On enclosed or sound-attenuated packages, keep enclosure louvers and cooling airflow paths clear so combustion and radiator air aren't restricted in hot months. In cold climates, confirm jacket-water heater operation and use a grease rated to the low end of the ambient range at generator bearing points.
G3412C common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| 1D-4540 | Bolt,Machine Fuel Filter Mounting | Fuel system service | Check fitment → |
| 1H-5514 | Bolt,Machine Engine Oil Filter Assembly | Lubrication service | Check fitment → |
| 1R-1808 | Filter As-Engine Oil | Lubrication service | Check fitment → |
| 4N-7082 | Shield-Oil Filter | Lubrication service | Check fitment → |
| 9S-8752 | Nut-Full | Scheduled service item | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
G3412C fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| 100-01 | Engine oil pressure below the protective low-pressure limit | Low oil level, plugged oil filter, worn oil pump, or a failed oil pressure sensor circuit | Shut engine down, check oil level and filter condition, verify sensor wiring before restart |
| 110-00 | Engine coolant temperature above the protective high-temperature limit | Low coolant level, blocked radiator or heat exchanger, failed water pump, or a stuck thermostat | Shut engine down, let it cool, check coolant level and flow, inspect sensor wiring if the reading looks implausible |
| 190-08 | Engine speed/timing signal from the crank or cam sensor is missing or erratic | Damaged speed/timing sensor, wiring or connector fault, or incorrect sensor air gap | Check sensor mounting and gap, inspect wiring and connectors, replace the sensor if the signal stays erratic |
| 17-05 | Gas shutoff valve circuit open or valve not responding to the energize-to-run command | Broken wiring or connector, or a failed shutoff valve coil | Check valve wiring and connector, confirm control voltage reaches the valve, replace the valve if the coil will not energize |
| 318-02 | Right-bank detonation (knock) sensor signal erratic or absent | Loose or damaged sensor, wiring fault, or lost sensor mounting torque | Check sensor connector and mounting torque, test wiring continuity, replace the sensor if the fault persists; engine loses knock protection on that bank until cleared |
| 319-02 | Left-bank detonation (knock) sensor signal erratic or absent | Loose or damaged sensor, wiring fault, or lost sensor mounting torque | Check sensor connector and mounting torque, test wiring continuity, replace the sensor if the fault persists; engine loses knock protection on that bank until cleared |
| 325 | Detonation (knock) detected beyond what ignition-timing retard can control | Poor fuel gas quality or low methane number, incorrect air/fuel ratio setting, worn spark plugs, or excess load/high intake air temperature | Check fuel gas quality and air/fuel ratio calibration, inspect spark plugs, reduce load, verify intake air temperature before restart |
| AL4 | Generator-set control panel alarm indicating the engine ECM has an active fault; the panel shows only the alarm, not the underlying detail | Any ECM-detected fault severe enough to be flagged to the control panel — sensor, ignition, detonation, or fuel-system related | Step through the control panel fault log or connect a service diagnostic tool to the engine ECM to read the specific code, then troubleshoot that component |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
G3412C attachments & work tools
Work tools and attachments
G3412C is a stationary industrial engine used in gas generator sets and gas-compression packages, not a mobile work machine. It has no buckets, forks, blades, or other work-tool attachments and no quick-coupler system of the kind used on excavators, loaders, or dozers.
Package and skid mounting
Standard factory configuration is an open, skid-mounted genset package with the engine, generator end, and control panel on a common structural base. This open-skid arrangement is the base build for this engine size class before any enclosure or cooling options are added.
Enclosure options
A dropover weather enclosure can be fitted over the open skid as an extra-cost option. Sound-attenuated enclosure packages are also offered for noise-sensitive installation sites in this power class.
Cooling / radiator configuration
Standard cooling is a package-mounted, engine-driven radiator and fan sized to the set. Units in this class can also be ordered without the radiator for connection to a remote radiator or a facility cooling-water circuit, depending on site heat-rejection needs.
Control panel and switchgear
Sets are fitted with a Cat EMCP digital generator control and protection panel as standard. Options for this class include load-sharing modules, remote monitoring, and paralleling switchgear for multi-unit or utility-paralleling installations.
All G3412C assemblies by section
Every catalogued assembly group for the Caterpillar G3412C. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Air Inlet And Exhaust System
118-7589 Aftercooler Gp-Water
| 0L***51 | Bolt Starting Engine Fuel Tank Bracket To Diesel Intake Manifold | 3 |
| 0S***71 | Screw,Cap,Hexagon; Tube Assembly To Turbocharger And Elbow Mounting | 28 |
| 0S***17 | Bolt --Use Open Hole In Compressor Body | 1 |
107-7215 Aftercooler Gp-Water
| 0L***51 | Bolt Starting Engine Fuel Tank Bracket To Diesel Intake Manifold | 3 |
| 0S***71 | Screw,Cap,Hexagon; Tube Assembly To Turbocharger And Elbow Mounting | 28 |
| 0T***73 | Bolt (3/8) (63.5mm Long) (On Cab Of Cover Assem.) | 14 |
7e-9632 Air Cleaner Gp
| 1B***82 | Bolt (1.25 In. Long X .313 In. Dia.) | 2 |
| 5S***03 | Nut-Full; (5/16 X 18 Thd) | 2 |
| 7E***32 | Air Cleaner Group | 1 |
125-7155 Air Cleaner Gp
| 00***25 | Elbow-Flared | 1 |
| 0L***51 | Bolt Starting Engine Fuel Tank Bracket To Diesel Intake Manifold | 10 |
| 0S***88 | Bolt,Machine; Hose Assembly Mounting,Hose Assembly To Transmission,And To Torque Converter | 6 |
124-5623 Bypass Gp-Exhaust
| 03***67 | Connector-Flared -- Adapter To Hose As. | 1 |
| 03***68 | Elbow (For Use With Shallow Pan) | 1 |
| 09***55 | Washer-Copper | 1 |
145-3251 Bypass Gp-Exhaust
| 11***72 | Diaphragm | 1 |
| 12***59 | Base As | 1 |
| 14***49 | Valve | 1 |
122-1158 Bypass Gp-Exhaust
| 12***58 | Bypass Group-Exhaust | 1 |
| 12***59 | Base As | 1 |
| 1B***78 | Nut,Plain,Hexagon Rod To Lever Uoc:Bsv,Bsx | 1 |
4p-2587 Bypass Gp-Exhaust
| 1B***78 | Nut,Plain,Hexagon Rod To Lever Uoc:Bsv,Bsx | 1 |
| 1P***59 | Washer; (0.063-In Thk) | 1 |
| 2P***43 | Valve | 1 |
113-6053 Cartridge Gp-Turbocharger
| 11***53 | Cartridge Group-Turbocharger | 1 |
| 1P***20 | Ring-Seal | 1 |
| 1S***70 | Nut (.687" O.D.) | 1 |
2w-7848 Fitting Gp-Exhaust
| 1B***57 | Nut-Full; 19.05mm(.75in)O.D. | 8 |
| 21***45 | Bellows As | 1 |
| 2W***48 | Fitting Group-Exhaust | 1 |
112-9346 Lines Gp-Air
| 0S***71 | Screw,Cap,Hexagon; Tube Assembly To Turbocharger And Elbow Mounting | 4 |
| 0S***94 | Bolt (1 In. Long 3/8 In. Dia.); Plate Assembly To Support Assembly | 2 |
| 10***16 | Tube As-Air | 1 |
105-4666 Manifold Gp-Exhaust -Water Cooled
| 01***50 | Plug To Aftercooler Inlet Elbow | 12 |
| 0S***90 | Bolt; (3/8-16x2in)(Clip Thru Spacer To Bracket As) | 8 |
| 0S***08 | Bolt-Support To Starting Engine Timing Gear Housing | 3 |
125-7057 Mounting Gp-Air Cleaner
| 03***37 | Spacer; (10.93x19.05x25.4-mm Thk) | 1 |
| 0L***52 | Capscrew (3/8 - 16 Nc X 3 1/4 Gd8, Hex) | 1 |
| 0L***70 | Bolt (2-1/4") Filler Tube Assembly To Transfer Drive Case | 1 |
106-3561 Turbocharger Gp
| 10***61 | Turbocharger Group | 1 |
| 11***53 | Cartridge Group-Turbocharger | 1 |
| 11***55 | Cover-Compressor | 1 |
111-8904 Turbocharger Gp
| 10***61 | Turbocharger Group | 1 |
| 11***04 | Turbocharger Group | 1 |
| 16***00 | Locknut; (High Temperature) | 4 |
Basic Engine
115-1336 Camshaft Gp
| 0S***09 | Bolt (3/4") Filler Tube Assembly To Transfer Drive Case | 2 |
| 11***35 | Camshaft As | 1 |
| 11***36 | Camshaft Group | 1 |
226-1797 Conversion Gp-Cylinder Head
| 11***43 | Seal-O-Ring | 1 |
| 13***51 | Seal; (Pressure Relief) | 1 |
| 21***45 | Extension-Plug | 1 |
226-1798 Conversion Gp-Cylinder Head
| 11***43 | Seal-O-Ring | 1 |
| 13***51 | Seal; (Pressure Relief) | 1 |
| 21***46 | Insulator | 1 |
127-7506 Coupling Gp-Flexible
| 12***41 | Coupling-Flexible | 1 |
| 12***42 | Collar | 2 |
| 12***06 | Coupling Group-Flexible | 1 |
6n-1849 Cover Gp-Cylinder Block
| 0S***94 | Bolt (1 In. Long 3/8 In. Dia.); Plate Assembly To Support Assembly | 72 |
| 23***72 | Seal-Integral | 11 |
| 4N***94 | Cover | 1 |
162-2917 Cover Gp-Cylinder Block
| 0S***88 | Bolt,Machine; Hose Assembly Mounting,Hose Assembly To Transmission,And To Torque Converter | 6 |
| 0S***94 | Bolt (1 In. Long 3/8 In. Dia.); Plate Assembly To Support Assembly | 66 |
| 12***15 | Cover | 2 |
4w-6732 Cover Gp-Flywheel Housing
| 0S***89 | Bolt, Hex. Hd., 5/8"-11 N.C. X 1 3/4" | 3 |
| 0S***94 | Bolt (1 In. Long 3/8 In. Dia.); Plate Assembly To Support Assembly | 5 |
| 0S***19 | Bolt,Machine Gear Retaining Part Of Kit P/N 1w***46 | 1 |
107-7528 Cover Gp-Front Housing
| 0L***52 | Capscrew (3/8 - 16 Nc X 3 1/4 Gd8, Hex) | 6 |
| 0S***94 | Bolt (1 In. Long 3/8 In. Dia.); Plate Assembly To Support Assembly | 3 |
| 10***28 | Cover Group-Front Housing; Cover Gp-Front Structure | 1 |
213-0479 Cover Gp-Front Housing
| 0L***52 | Capscrew (3/8 - 16 Nc X 3 1/4 Gd8, Hex) | 6 |
| 0S***94 | Bolt (1 In. Long 3/8 In. Dia.); Plate Assembly To Support Assembly | 3 |
| 10***98 | Cover As-Ring | 1 |
107-7138 Cover Gp-Valve Mechanism
| 10***44 | Base-Valve Mechanism Cover | 4 |
| 10***38 | Cover Group-Valve Mechanism | 1 |
| 10***39 | Cover Group-Valve Mechanism | 4 |
107-7139 Cover Gp-Valve Mechanism
| 10***39 | Cover Group-Valve Mechanism | 1 |
| 10***40 | Cover-Valve | 1 |
| 7C***14 | Adapter | 1 |
213-3202 Crankshaft As
| 15***40 | Gear-Crankshaft; (99-Teeth) | 1 |
| 21***02 | Crankshaft As | 1 |
| 4N***84 | Dowel; (.75 Long) | 1 |
251-2301 Crankshaft Gp
| 21***02 | Crankshaft As | 1 |
| 25***01 | Crankshaft Group | 1 |
| 25***52 | Plate-Thrust; (Crankshaft) | 2 |
4n-0922 Crankshaft Gp
| 11***66 | Gear-Crankshaft; (99-Teeth) | 1 |
| 24***18 | Kit-Crankshaft Bearing | 0 |
| 25***52 | Plate-Thrust; (Crankshaft) | 2 |
116-1414 Cylinder Block As
| 11***20 | Seal-O-Ring; (Mid-Liner) | 12 |
| 11***14 | Cylinder Block As | 1 |
| 14***17 | Seal-O-Ring; (140.20mm Id) | 12 |
116-1413 Cylinder Block Gp
| 11***13 | Cylinder Block Group | 1 |
| 11***14 | Cylinder Block As | 1 |
| 15***10 | Tube As-Oil Jet | 12 |
124-7373 Cylinder Head As
| 11***15 | Insert-Valve Seat; (Exhaust)(Exhaust) | 12 |
| 12***52 | Insert-Valve Seat; (Inlet)(Standard) | 12 |
| 12***84 | Guide-Valve; (Exhaust) | 12 |
151-4951 Cylinder Head As
| 11***15 | Insert-Valve Seat; (Exhaust)(Exhaust) | 12 |
| 12***52 | Insert-Valve Seat; (Inlet)(Standard) | 12 |
| 12***56 | Insert-Valve Seat; (Exhaust 0.13 Os Od) | 0 |
288-0475 Cylinder Head As
| 10***73 | Seal-O-Ring; (43.82mm Id) | 6 |
| 21***38 | Seat-Valve | 12 |
| 21***39 | Adapter | 6 |
151-5243 Cylinder Head As
| 11***15 | Insert-Valve Seat; (Exhaust)(Exhaust) | 12 |
| 12***52 | Insert-Valve Seat; (Inlet)(Standard) | 12 |
| 12***56 | Insert-Valve Seat; (Exhaust 0.13 Os Od) | 0 |
124-7371 Cylinder Head Gp
| 0L***52 | Capscrew (3/8 - 16 Nc X 3 1/4 Gd8, Hex) | 19 |
| 12***71 | Cylinder Head Group | 1 |
| 12***72 | Cylinder Head Group | 1 |
124-7372 Cylinder Head Gp
| 10***39 | Valve-Exhaust | 12 |
| 12***53 | Valve-Inlet | 12 |
| 12***72 | Cylinder Head Group | 1 |
203-9169 Cylinder Head Gp
| 20***67 | Cylinder Head Group | 1 |
| 20***69 | Cylinder Head Group | 1 |
| 21***18 | Adapter | 6 |
311-7557 Cylinder Head Gp
| 21***32 | Valve-Inlet | 12 |
| 21***36 | Guide-Valve; (Inlet)(Standard) | 12 |
| 21***37 | Guide-Valve; (Exhaust)(Standard) | 12 |
173-1977 Cylinder Head Gp
| 15***78 | Cylinder Head Group | 1 |
| 17***77 | Cylinder Head Group | 1 |
| 21***18 | Adapter | 6 |
203-9167 Cylinder Head Gp
| 12***53 | Valve-Inlet | 12 |
| 15***43 | Cylinder Head As | 1 |
| 20***39 | Valve-Exhaust | 12 |
216-8340 Cylinder Head Gp
| 0L***52 | Capscrew (3/8 - 16 Nc X 3 1/4 Gd8, Hex) | 22 |
| 1A***83 | Bolt (4.75" Long-Location "B") | 2 |
| 21***12 | Gasket; (Cylinder Head) | 2 |
151-6278 Cylinder Head Gp
| 10***39 | Valve-Exhaust | 12 |
| 12***53 | Valve-Inlet | 12 |
| 15***43 | Cylinder Head As | 1 |
6n-7788 Damper & Pulley Gp
| 16***30 | Damper As | 1 |
| 1F***58 | Nut-Full; (1/2-13-Thd)(Air Lines) | 12 |
| 2D***55 | Stud-Taperlock; (1/2-13x3.58-In) | 12 |
139-9028 Damper & Pulley Gp
| 13***28 | Damper & Pulley Group | 1 |
| 16***30 | Damper As | 1 |
| 1F***58 | Nut-Full; (1/2-13-Thd)(Air Lines) | 12 |
1n-3473 Flywheel Gp
| 0S***02 | Bolt; (5/8-18x3.5-In) | 12 |
| 1N***72 | Cylinder Block Group | 1 |
| 1N***73 | Flywheel Group | 1 |
4n-6341 Gear Gp-Front -Timing
| 0S***71 | Screw,Cap,Hexagon; Tube Assembly To Turbocharger And Elbow Mounting | 1 |
| 0T***73 | Bolt (3/8) (63.5mm Long) (On Cab Of Cover Assem.) | 1 |
| 11***17 | Plate-Thrust | 1 |
4n-3825 Gear Gp-Rear
| 1B***75 | Bolt (" " " ); Bolt ( " " " ) | 4 |
| 4N***25 | Gear Group-Rear; Rear Timing Gear Group | 1 |
| 4W***85 | Gear-Camshaft; (86-Teeth) | 1 |
124-6646 Guard Gp-Damper
| 12***46 | Guard Group-Damper | 1 |
| 12***47 | Guard As-Damper | 1 |
| 4L***54 | Capscrew; (3/8-16x21 In) (Gd8) (Hex Hd) (4-Roller) | 1 |
4w-6115 Housing Gp-Flywheel
| 0L***51 | Bolt Starting Engine Fuel Tank Bracket To Diesel Intake Manifold | 4 |
| 0T***73 | Bolt (3/8) (63.5mm Long) (On Cab Of Cover Assem.) | 4 |
| 16***93 | Gasket-Cylinder | 1 |
184-1667 Housing Gp-Front
| 18***65 | Housing-Drive | 1 |
| 18***67 | Housing Group-Front | 1 |
| 1W***29 | Shaft-Drive; (Idler & Governor) | 2 |
4n-5226 Housing Gp-Front
| 0L***43 | Bolt 63.5 mm (3/8" X 2 1/2" -Cover Assembly To Fender | 3 |
| 0L***52 | Capscrew (3/8 - 16 Nc X 3 1/4 Gd8, Hex) | 2 |
| 16***45 | Gasket-Cylinder Block | 1 |
184-1666 Housing Gp-Rear
| 18***66 | Housing Group-Rear | 1 |
| 3S***13 | Plug,Machine Thread Cylinder Block | 1 |
| 6F***97 | Bearing-Sleeve | 1 |
111-8924 Lifter Gp-Valve
| 10***39 | Lifter As-Valve | 24 |
| 11***24 | Lifter Group-Valve | 1 |
| 6N***72 | Spring-Guide | 24 |
110-6230 Lifting Gp-Engine
| 0S***85 | Bolt; 12.7 mm (1/2") Diameter X 38.1 mm (1 1/2") Length Generator To Engine | 4 |
| 10***57 | Bracket-Lifting; (Front, Rh) | 1 |
| 10***58 | Bracket-Lifting; (Rear, Lh) | 1 |
124-4403 Pan Gp-Oil
| 0S***94 | Bolt (1 In. Long 3/8 In. Dia.); Plate Assembly To Support Assembly | 6 |
| 12***03 | Pan Group-Oil | 1 |
| 12***04 | Pan As-Oil | 1 |
105-8316 Piston & Rod Gp
| 10***80 | Ring-Piston; (Intermediate) | 1 |
| 10***47 | Ring-Piston; (Top) | 1 |
| 10***16 | Piston & Rod Group | 1 |
257-2694 Piston & Rod Gp
| 10***80 | Ring-Piston; (Intermediate) | 1 |
| 15***89 | Ring-Piston; (Top) | 1 |
| 16***78 | Rod As-Connecting | 1 |
133-3837 Piston & Rod Gp
104-4214 Rocker Arm Gp
| 00***03 | Ring-Retaining | 2 |
| 0L***22 | Plug (.656" Dia.) | 2 |
| 10***12 | Rocker Arm As | 3 |
104-4213 Rocker Arm Gp
| 00***03 | Ring-Retaining | 2 |
| 0L***22 | Plug (.656" Dia.) | 2 |
| 10***12 | Rocker Arm As | 3 |
319-7401 Seal Gp-Crankshaft -Front
| 14***67 | Seal Group-Crankshaft; (Front) | 1 |
| 31***01 | Seal Group-Crankshaft; -Front | 1 |
319-0785 Seal Gp-Crankshaft -Rear
| 14***68 | Seal-Crankshaft; (Rear)(Flywheel Housing) | 1 |
| 31***85 | Seal Group-Crankshaft; -Rear | 1 |
124-5722 Support Gp-Engine
| 12***22 | Support Group-Engine | 1 |
| 12***23 | Support-Rear | 2 |
| 4D***04 | Washer,Flat Cover Mtg,Accessory Drive | 8 |
124-5754 Support Gp-Engine
| 0S***73 | Bolt (102mm Long); (1/2-13x4-In) | 8 |
| 12***54 | Support Group-Engine | 1 |
| 12***55 | Support As-Front | 1 |
220-3745 Valve Mechanism Gp
| 10***16 | Bridge As-Valve; (Inlet) | 12 |
| 10***17 | Bridge As-Valve; (Exhaust)(Each Includes) | 12 |
| 10***19 | Seat-Wear | 1 |
111-8925 Valve Mechanism Gp
| 10***16 | Bridge As-Valve; (Inlet) | 12 |
| 10***17 | Bridge As-Valve; (Exhaust)(Each Includes) | 12 |
| 10***13 | Rocker Arm Group | 2 |
Cooling System
4n-2388 Cooler Gp-Engine Oil
| 10***77 | Seal-O-Ring; (100.97mm Id) | 2 |
| 4N***88 | Cooler Group-Engine Oil; Engine Oil Cooler Group | 1 |
| 7C***45 | Core As-Oil Cooler; (Water Lines) | 1 |
124-5797 Cover Gp-Water Outlet
| 12***97 | Cover Group-Water Outlet | 1 |
| 12***98 | Cover As-Flanged | 1 |
| 2H***93 | Ferrule | 1 |
125-3404 Lines Gp-Water
| 0S***71 | Screw,Cap,Hexagon; Tube Assembly To Turbocharger And Elbow Mounting | 4 |
| 0S***90 | Bolt; (3/8-16x2in)(Clip Thru Spacer To Bracket As) | 2 |
| 0S***94 | Bolt (1 In. Long 3/8 In. Dia.); Plate Assembly To Support Assembly | 2 |
124-8591 Lines Gp-Water -Cooling
| 06***63 | Connector (No. 8 Hose) | 1 |
| 09***82 | Reducer | 1 |
| 0S***90 | Bolt; (3/8-16x2in)(Clip Thru Spacer To Bracket As) | 4 |
111-6836 Lines Gp-Water -Turbocharger Cooling
| 00***04 | Elbow | 1 |
| 00***99 | Connector-Flared | 1 |
| 00***25 | Elbow-Flared | 1 |
125-8033 Lines Gp-Water
| 0L***43 | Bolt 63.5 mm (3/8" X 2 1/2" -Cover Assembly To Fender | 1 |
| 0L***51 | Bolt Starting Engine Fuel Tank Bracket To Diesel Intake Manifold | 2 |
| 0L***52 | Capscrew (3/8 - 16 Nc X 3 1/4 Gd8, Hex) | 1 |
124-5794 Lines Gp-Water
| 12***94 | Lines Group-Water | 1 |
| 12***95 | Pipe As-Jacket Water Inlet | 1 |
| 5P***68 | * Hose-Radiator Inlet-16 cm(6.30 In.) | 0 |
102-0459 Pump Gp-Water
| 0S***94 | Bolt (1 In. Long 3/8 In. Dia.); Plate Assembly To Support Assembly | 1 |
| 10***49 | Adapter-Inlet | 1 |
| 10***59 | Pump Group-Water | 1 |
134-1487 Pump Gp-Water
| 0S***91 | Screw,Cap,Hexagon Bearing Retainer; Part Of Kit P/N 1w***82 | 1 |
| 10***85 | Retainer | 1 |
| 10***90 | Housing As-Pump | 1 |
137-1339 Pump Gp-Water
| 0S***91 | Screw,Cap,Hexagon Bearing Retainer; Part Of Kit P/N 1w***82 | 1 |
| 10***30 | Bearing As-Roller | 1 |
| 11***21 | Plug-Felt; (Water Pump Housing) | 1 |
105-0196 Pump Gp-Water
| 0S***91 | Screw,Cap,Hexagon Bearing Retainer; Part Of Kit P/N 1w***82 | 1 |
| 10***96 | Pump Group-Water | 1 |
| 10***85 | Retainer | 1 |
4n-5837 Pump Gp-Water
| 10***49 | Adapter-Inlet | 1 |
| 11***79 | Seal-O-Ring | 1 |
| 11***80 | Seal-O-Ring | 1 |
189-0855 Strainer As
| 18***55 | Strainer As | 1 |
146-1852 Switch Gp-Coolant Level
| 00***40 | Connector; (Flared) | 1 |
| 10***64 | Mount-Sandwich | 2 |
| 14***52 | Switch Group-Coolant Level | 1 |
Electrical And Starting System
136-3335 Box As-Terminal
| 13***93 | Hinge As; (Upper) | 1 |
| 13***94 | Hinge As; (Lower) | 1 |
| 13***98 | Latch As | 2 |
130-7480 Box As-Terminal
| 13***80 | Box As-Terminal | 1 |
| 13***93 | Hinge As; (Upper) | 1 |
| 13***94 | Hinge As; (Lower) | 1 |
142-6210 Box Gp-Control -Eis
| 03***74 | Fuse; (15-Ampere) | 1 |
| 10***36 | Plug As-Connector; (54-Pin), .. Carrier | 1 |
| 10***43 | Block-Fuse | 1 |
138-8357 Box Gp-Control -Eis
| 10***57 | Harness As-Panel; (Diagnostic, Emergency Stop) | 1 |
| 10***68 | Panel As-Eis | 1 |
| 10***72 | Seal; (Conduit Hole) | 2 |
108-1674 Box Gp-Control
| 10***57 | Harness As-Panel; (Diagnostic, Emergency Stop) | 1 |
| 10***68 | Panel As-Eis | 1 |
| 10***72 | Seal; (Conduit Hole) | 1 |
142-6213 Box Gp-Control -Eis
| 03***74 | Fuse; (15-Ampere) | 1 |
| 10***36 | Plug As-Connector; (54-Pin), .. Carrier | 1 |
| 10***43 | Block-Fuse | 1 |
138-8356 Box Gp-Control -Eis
| 10***57 | Harness As-Panel; (Diagnostic, Emergency Stop) | 1 |
| 10***68 | Panel As-Eis | 1 |
| 10***72 | Seal; (Conduit Hole) | 1 |
132-6898 Control Gp-Air Starting
| 00***28 | Nipple; (Close)(1/4-18 Npt) | 1 |
| 13***77 | Valve Group-Solenoid; -Air Start-Air Starting | 1 |
| 13***98 | Control Group-Air Starting | 1 |
111-0903 Control Gp-Engine Electronic
| 11***03 | Control Group-Engine Electronic | 1 |
| 11***43 | Control Group-Electronic; (Eis) | 1 |
205-0627 Control Gp-Engine Electronic
| 10***87 | Bolt; (M5x0.8x12-mm) | 2 |
| 20***27 | Control Group-Engine Electronic | 1 |
| 2H***15 | Washer; (0.219x0.41x0.031-In Thk) | 4 |
128-2500 Control Gp-Engine Electronic
| 12***00 | Control Group-Engine Electronic | 1 |
| 20***27 | Control Group-Engine Electronic | 1 |
214-6130 Conversion Gp-Ignition
| 11***43 | Seal-O-Ring | 1 |
| 13***51 | Seal; (Pressure Relief) | 1 |
| 21***45 | Extension-Plug | 1 |
214-6131 Conversion Gp-Ignition
| 11***43 | Seal-O-Ring | 1 |
| 13***51 | Seal; (Pressure Relief) | 1 |
| 21***46 | Insulator | 1 |
132-0140 Fastener Gp-Wiring Harness
| 13***40 | Fastener Group-Wiring Harness | 1 |
| 1S***93 | Strap; (Cable) (0.62in Dia) | 6 |
| 4P***81 | Clip (For Use With 7.9mm Wide Tie Wrap) | 6 |
195-8033 Fastener Gp-Wiring Harness
| 19***33 | Fastener Group-Wiring Harness | 1 |
| 1A***79 | Capscrew (5/16 - 18 Nc X 1 1/2 Gd5, Hex) | 3 |
| 3E***52 | Washer-Hard; (8.8x20.5x2.5-mm Thk) | 3 |
113-8966 Fastener Gp-Wiring Harness
| 0S***71 | Screw,Cap,Hexagon; Tube Assembly To Turbocharger And Elbow Mounting | 1 |
| 0S***94 | Bolt (1 In. Long 3/8 In. Dia.); Plate Assembly To Support Assembly | 1 |
| 0S***14 | Bolt (.25" Diameter-.50" Long) | 3 |
124-8680 Fastener Gp-Wiring Harness
| 0S***09 | Bolt (3/4") Filler Tube Assembly To Transfer Drive Case | 2 |
| 0S***71 | Screw,Cap,Hexagon; Tube Assembly To Turbocharger And Elbow Mounting | 1 |
| 0S***14 | Bolt (.25" Diameter-.50" Long) | 1 |
130-3592 Harness As-Power -Digital Voltage Regulator
| 13***92 | Harness As-Power; -Digital Voltage Regulator | 1 |
195-8022 Harness As-Wiring -Engine Shutoff
| 15***60 | Kit-Connecting Plug; (3-Pin)(Engine Sensor Wiring Harness) | 1 |
| 15***70 | Kit-Connecting Plug; (2-Pin)(Engine Sensor Wiring Harness) | 1 |
| 19***22 | Harness As-Wiring; -Engine Shutoff | 1 |
195-8025 Harness As-Wiring -Governor
| 19***25 | Harness As-Wiring; -Governor | 1 |
195-8026 Harness As-Wiring -Governor Actuator
| 19***26 | Harness As-Wiring; -Governor Actuator | 1 |
142-6208 Ignition Gp-Gas Engine
| 0S***14 | Bolt (.25" Diameter-.50" Long) | 1 |
| 0S***16 | Screw,Cap,Hexagon H Receptacle Mtg; Bolt Brackets To Firewall Assembly | 1 |
| 10***25 | Clip | 4 |
234-9638 Ignition Gp-Gas Engine
| 03***43 | Screw; (1/4-20x0.625-In) | 1 |
| 0S***14 | Bolt (.25" Diameter-.50" Long) | 1 |
| 10***00 | Bracket As-Control | 1 |
142-6211 Ignition Gp-Gas Engine
| 03***43 | Screw; (1/4-20x0.625-In) | 1 |
| 0S***14 | Bolt (.25" Diameter-.50" Long) | 1 |
| 10***00 | Bracket As-Control | 1 |
216-4021 Ignition Gp-Gas Engine
| 03***43 | Screw; (1/4-20x0.625-In) | 1 |
| 0S***14 | Bolt (.25" Diameter-.50" Long) | 1 |
| 10***00 | Bracket As-Control | 1 |
144-7161 Ignition Gp-Gas Engine
| 03***43 | Screw; (1/4-20x0.625-In) | 1 |
| 0S***14 | Bolt (.25" Diameter-.50" Long) | 1 |
| 10***00 | Bracket As-Control | 1 |
216-4022 Ignition Gp-Gas Engine
| 0S***14 | Bolt (.25" Diameter-.50" Long) | 1 |
| 0S***16 | Screw,Cap,Hexagon H Receptacle Mtg; Bolt Brackets To Firewall Assembly | 1 |
| 10***25 | Clip | 4 |
234-9639 Ignition Gp-Gas Engine
| 03***43 | Screw; (1/4-20x0.625-In) | 1 |
| 0S***14 | Bolt (.25" Diameter-.50" Long) | 1 |
| 10***25 | Clip | 8 |
129-1364 Ignition Gp-Gas Engine
| 03***43 | Screw; (1/4-20x0.625-In) | 1 |
| 0S***14 | Bolt (.25" Diameter-.50" Long) | 1 |
| 10***25 | Clip | 8 |
234-6044 Plug Gp-Box
| 23***44 | Plug Group-Box | 1 |
| 7J***82 | Plug | 1 |
| 8T***37 | Plug-Seal; (40 Pin Connector) | 20 |
108-1655 Sensor & Mounting Gp
| 03***46 | Elbow, 90 Deg Adj., 1/4in. J.I.C. X 7/16in.-14 Str. Thd. | 1 |
| 0S***88 | Bolt,Machine; Hose Assembly Mounting,Hose Assembly To Transmission,And To Torque Converter | 2 |
| 0S***90 | Bolt; (3/8-16x2in)(Clip Thru Spacer To Bracket As) | 6 |
3e-1854 Sensor Gp-Pressure
| 3E***54 | Sensor Group-Pressure | 1 |
| 8T***30 | Socket-Connector; (16-Ga To 18-Ga)(Throttle Position Sensor) | 3 |
| 8T***31 | Plug-Connector; (3-Pin) | 1 |
102-9029 Sensor Gp-Speed
| 10***29 | Sensor Group-Speed; -Timing-Engine Speed | 1 |
| 18***36 | Socket-Connector; (16-Ga To 18-Ga) | 3 |
| 8L***86 | Seal-O-Ring (Id=16.36mm); (16.36-mm Id) | 1 |
212-6298 Sensor Gp-Speed
| 21***98 | Sensor Group-Speed | 1 |
| 4B***81 | Washer--Use With Customer'S Ground Bolt | 1 |
| 9X***92 | Sensor Group-Speed; -Timing | 1 |
302-6257 Sensor Gp-Speed
| 11***66 | Seal-O-Ring | 1 |
| 13***07 | Washer; (21.1x28.1x0.9-mm Thk) | 1 |
| 18***40 | Socket-Connector; (14-Ga To 18-Ga)(14-Ga To 18-Ga) | 3 |
9x-5392 Sensor Gp-Speed
| 17***49 | Strap; (Marker) | 1 |
| 18***35 | Pin-Connector; (16-Ga To 18-Ga) | 2 |
| 8T***32 | Receptacle-Connector; (3-Pin)(Throttle Position Sensor) | 1 |
2s-7227 Starting Motor Gp-Electric
| 2S***27 | Starter Group-Electric; Electric Starter Group | 1 |
| 4N***59 | Gasket; (Starting Motor) | 1 |
| 6V***27 | Starting Motor Group-Electric | 1 |
6v-0890 Starting Motor Gp-Electric
| 03***21 | Shim Lever Housing | 1 |
| 03***23 | Bolt; (1/4-28x1-In) | 13 |
| 04***65 | Screw 19.05 mm(.750 In.) Long | 4 |
237-1962 Starting Motor Gp-Electric
| 03***21 | Shim Lever Housing | 1 |
| 04***65 | Screw 19.05 mm(.750 In.) Long | 4 |
| 0S***97 | Capscrew (1/4 - 28 Nf X 1 Gd8, Hex) | 13 |
6v-0927 Starting Motor Gp-Electric
| 03***21 | Shim Lever Housing | 1 |
| 03***23 | Bolt; (1/4-28x1-In) | 13 |
| 04***65 | Screw 19.05 mm(.750 In.) Long | 4 |
175-2308 Switch Gp-Magnetic
| 01***80 | Lockwasher | 2 |
| 10***02 | Kit-Receptacle; (2-Pin)(Engine Sensor Wiring Harness) | 1 |
| 17***08 | Switch Group-Magnetic; -24-Volt-Start Relay-Main Relay | 1 |
118-3534 Switch Gp-Magnetic
| 11***34 | Switch Group-Magnetic; -Start Relay | 1 |
| 17***08 | Switch Group-Magnetic; -24-Volt-Start Relay-Main Relay | 1 |
| 17***09 | Switch Group-Magnetic; -24-Volt-Start Relay | 1 |
175-2309 Switch Gp-Magnetic
| 01***80 | Lockwasher | 2 |
| 10***02 | Kit-Receptacle; (2-Pin)(Engine Sensor Wiring Harness) | 1 |
| 11***81 | Switch As-Magnetic; (Start Relay) | 1 |
327-9366 Transformer Gp
| 23***48 | Transformer Group-Ignition | 1 |
| 31***62 | Spring | 1 |
| 32***66 | Transformer Group | 1 |
131-3277 Transformer Gp-Ignition
| 11***43 | Seal-O-Ring | 1 |
| 12***38 | Spring-Transformer | 1 |
| 12***14 | Spacer; (23.8x46.02x3.4-mm Thk) | 1 |
327-9367 Transformer Gp-Ignition
| 23***52 | Transformer Group-Ignition | 1 |
| 31***62 | Spring | 1 |
| 32***67 | Transformer Group-Ignition | 1 |
232-6348 Transformer Gp-Ignition
| 11***43 | Seal-O-Ring | 1 |
| 12***38 | Spring-Transformer | 1 |
| 12***14 | Spacer; (23.8x46.02x3.4-mm Thk) | 1 |
232-6349 Transformer Gp-Ignition
| 11***43 | Seal-O-Ring | 1 |
| 12***58 | Insulator | 1 |
| 12***71 | Terminal As | 1 |
327-9369 Transformer Gp-Ignition
| 23***53 | Transformer Group-Ignition | 1 |
| 31***62 | Spring | 1 |
| 32***69 | Transformer Group-Ignition | 1 |
232-6352 Transformer Gp-Ignition
| 11***43 | Seal-O-Ring | 1 |
| 12***38 | Spring-Transformer | 1 |
| 12***14 | Spacer; (23.8x46.02x3.4-mm Thk) | 1 |
122-8070 Transformer Gp-Ignition
| 11***43 | Seal-O-Ring | 1 |
| 12***58 | Insulator | 1 |
| 12***70 | Transformer Group-Ignition | 1 |
232-6353 Transformer Gp-Ignition
| 11***43 | Seal-O-Ring | 1 |
| 12***38 | Spring-Transformer | 1 |
| 13***51 | Seal; (Pressure Relief) | 1 |
129-8802 Transformer Gp-Ignition
| 12***33 | Seal As | 1 |
| 12***16 | Terminal As | 1 |
| 12***02 | Transformer Group-Ignition | 1 |
130-5177 Valve Gp-Solenoid -Air Start
| 10***02 | Kit-Receptacle; (2-Pin)(Engine Sensor Wiring Harness) | 1 |
| 10***31 | Valve Group-Solenoid; (Air Start) | 1 |
| 13***77 | Valve Group-Solenoid; -Air Start-Air Starting | 1 |
108-1671 Wiring Gp-Eis
| 10***71 | Wiring Group-Eis | 1 |
| 10***74 | Box Group-Control; (Eis) | 1 |
| 11***89 | Harness As-Engine; (Interconnect) | 1 |
135-2864 Wiring Gp-Eis -Eis
| 10***74 | Box Group-Control; (Eis) | 1 |
| 13***20 | Harness As-Sensor; (Eis) | 1 |
| 13***64 | Wiring Group-Eis; -Eis | 1 |
136-3336 Wiring Gp-Eis -Eis
| 10***57 | Harness As-Panel; (Diagnostic, Emergency Stop) | 1 |
| 10***68 | Panel As-Eis | 1 |
| 10***72 | Seal; (Conduit Hole) | 2 |
110-1235 Wiring Gp-Engine
| 0L***51 | Bolt Starting Engine Fuel Tank Bracket To Diesel Intake Manifold | 2 |
| 0S***94 | Bolt (1 In. Long 3/8 In. Dia.); Plate Assembly To Support Assembly | 1 |
| 0S***14 | Bolt (.25" Diameter-.50" Long) | 1 |
195-8030 Wiring Gp-Engine
| 0S***14 | Bolt (.25" Diameter-.50" Long) | 2 |
| 0S***16 | Screw,Cap,Hexagon H Receptacle Mtg; Bolt Brackets To Firewall Assembly | 1 |
| 0S***18 | Bolt; (5/16-18x1-In)(Hydraulic Pump) | 2 |
195-8029 Wiring Gp-Engine
| 0S***16 | Screw,Cap,Hexagon H Receptacle Mtg; Bolt Brackets To Firewall Assembly | 1 |
| 0S***18 | Bolt; (5/16-18x1-In)(Hydraulic Pump) | 2 |
| 12***83 | Plug As-Connector; (1-Pin) | 2 |
194-0906 Wiring Gp-Engine
| 0S***16 | Screw,Cap,Hexagon H Receptacle Mtg; Bolt Brackets To Firewall Assembly | 4 |
| 0T***02 | Bolt; (3/8-16x0.625-In)(Shield To Head) | 2 |
| 0T***73 | Bolt (3/8) (63.5mm Long) (On Cab Of Cover Assem.) | 1 |
Engine Arrangement
124-7343 Engine Ar
| 10***59 | Pump Group-Water | 1 |
| 10***16 | Piston & Rod Group | 12 |
| 10***38 | Cover Group-Valve Mechanism | 1 |
Fuel System
9y-0831 Carburetor Gp
| 06***40 | Seal-O-Ring (Id=37.69mm) | 2 |
| 09***24 | Screw As; (12-24x0.625-In) | 12 |
| 10***39 | Body As; (Low Pressure) | 1 |
130-5696 Carburetor Gp
| 06***40 | Seal-O-Ring (Id=37.69mm) | 2 |
| 09***24 | Screw As; (12-24x0.625-In) | 12 |
| 10***75 | Piston-Plate | 1 |
124-6852 Carburetor Gp
| 0S***95 | Bolt 1.25 In. (31.75 mm) Long Guard Assemblies To Radiator Guard | 4 |
| 11***10 | Pipe As-Regulating | 1 |
| 12***52 | Carburetor Group | 1 |
125-1376 Control Gp-Carburetor
| 08***38 | Sleeve; (11x20x9mm Thk) | 3 |
| 0L***43 | Bolt 63.5 mm (3/8" X 2 1/2" -Cover Assembly To Fender | 3 |
| 0S***85 | Bolt; 12.7 mm (1/2") Diameter X 38.1 mm (1 1/2") Length Generator To Engine | 2 |
136-8327 Control Gp-Governor
| 10***02 | Terminal; (Single) | 6 |
| 11***37 | Spacer; (Terminal) | 1 |
| 11***42 | Terminal; (Double) | 3 |
136-8326 Control Gp-Governor
| 12***99 | Wrap-Spiral; (3/8-In Od)(307-cm) | 0 |
| 12***61 | Panel As | 1 |
| 13***55 | Harness As-Wiring | 1 |
9y-9840 Conversion Gp-Governor Drive
| 2B***95 | Cap Screw--Tube Assembly To Air Inlet Pipe | 4 |
| 6L***28 | Gasket-Governor Mounting | 1 |
| 9M***74 | Washer-Hard; (8.8x16x2-mm Thk)(Hard) | 4 |
107-7897 Drive Gp-Governor
| 0L***52 | Capscrew (3/8 - 16 Nc X 3 1/4 Gd8, Hex) | 6 |
| 0S***94 | Bolt (1 In. Long 3/8 In. Dia.); Plate Assembly To Support Assembly | 3 |
| 10***96 | Ring-Timing | 1 |
107-8515 Drive Gp-Governor
| 0S***88 | Bolt,Machine; Hose Assembly Mounting,Hose Assembly To Transmission,And To Torque Converter | 2 |
| 0S***91 | Screw,Cap,Hexagon Bearing Retainer; Part Of Kit P/N 1w***82 | 4 |
| 10***43 | Cover-Magneto Drive | 1 |
184-1668 Drive Gp-Governor
| 0S***88 | Bolt,Machine; Hose Assembly Mounting,Hose Assembly To Transmission,And To Torque Converter | 2 |
| 0S***91 | Screw,Cap,Hexagon Bearing Retainer; Part Of Kit P/N 1w***82 | 4 |
| 0S***15 | Bolt 19 mm (.75 In.) Long Return Air Console To Enclosed Rops | 2 |
7w-2363 Regulator As-Gas Pressure
| 1H***20 | Seal-O-Ring; (59.92mm Id) | 1 |
| 2B***08 | Plug-- Hydraulic Pump Mounting Cage | 1 |
| 6L***40 | Spring (Red) | 1 |
132-1429 Regulator Gp-Gas Pressure
| 00***25 | Elbow-Flared | 1 |
| 10***05 | Adapter-Pipe | 1 |
| 13***29 | Regulator Group-Gas Pressure | 1 |
125-6692 Regulator Gp-Gas Pressure
| 00***25 | Elbow-Flared | 1 |
| 05***41 | Elbow | 1 |
| 06***63 | Connector (No. 8 Hose) | 1 |
104-6775 Regulator Gp-Gas Pressure
| 10***75 | Regulator Group-Gas Pressure | 1 |
| 13***83 | Spring | 1 |
| 13***84 | Body-Valve; (Gas Pressure Regulator) | 1 |
133-7592 Valve Gp-Fuel
| 12***29 | Plate | 1 |
| 12***30 | Piston | 1 |
| 13***92 | Valve Group-Fuel | 1 |
7e-1598 Valve Gp-Fuel
| 12***29 | Plate | 1 |
| 12***30 | Piston | 1 |
| 1H***04 | Screw Assembly Adapter To Mounting Plate; Screw Assembly-Adapter To Mounting Plate | 6 |
Generators
5n-2975 Installation Ar-Generator
| 1D***85 | Cap Screw (3 1/4" Long) | 6 |
| 5N***75 | Installation Ar-Generator | 1 |
| 5P***66 | Capscrew; (Hex Hd) (1/2-13 Nc X 1 1/2) (Gd 8 Z) | 16 |
Lubrication System
2n-8220 Breather Gp -Crankcase
| 2N***09 | Clamp; (V-Band) | 1 |
| 2N***20 | Breather Group; Breather Gp-Crankcase | 1 |
| 4F***90 | Seal (2.10" Inside Diameter) | 1 |
4n-2481 Fastener Gp-Oil Pump Mounting -Engine
| 0L***43 | Bolt 63.5 mm (3/8" X 2 1/2" -Cover Assembly To Fender | 2 |
| 0S***90 | Bolt; (3/8-16x2in)(Clip Thru Spacer To Bracket As) | 1 |
| 4N***81 | Fastener Group-Oil Pump Mounting; Oil Pump Mounting Fastener Group | 1 |
4n-2759 Filter Gp-Engine Oil
| 0S***71 | Screw,Cap,Hexagon; Tube Assembly To Turbocharger And Elbow Mounting | 2 |
| 0S***90 | Bolt; (3/8-16x2in)(Clip Thru Spacer To Bracket As) | 2 |
| 0S***91 | Screw,Cap,Hexagon Bearing Retainer; Part Of Kit P/N 1w***82 | 4 |
224-0832 Fumes Disposal Gp
| 0S***94 | Bolt (1 In. Long 3/8 In. Dia.); Plate Assembly To Support Assembly | 2 |
| 1A***29 | Bolt (1-1/8") Tube Assembly To Transfer Drive Case | 1 |
| 22***32 | Fumes Disposal Group | 1 |
127-4658 Fumes Disposal Gp
| 0S***94 | Bolt (1 In. Long 3/8 In. Dia.); Plate Assembly To Support Assembly | 2 |
| 12***89 | Adapter As-Line | 1 |
| 12***58 | Fumes Disposal Group | 1 |
7c-5154 Fumes Disposal Gp
| 0L***51 | Bolt Starting Engine Fuel Tank Bracket To Diesel Intake Manifold | 3 |
| 0S***88 | Bolt,Machine; Hose Assembly Mounting,Hose Assembly To Transmission,And To Torque Converter | 1 |
| 0S***94 | Bolt (1 In. Long 3/8 In. Dia.); Plate Assembly To Support Assembly | 2 |
124-4458 Gauge Gp-Oil Level (Dipstick)
| 12***58 | Gauge Group-Oil Level (Dipstick) | 1 |
| 12***59 | Gauge-Oil Level | 1 |
| 2H***87 | Cap-Level Gauge | 1 |
124-4457 Gauge Gp-Oil Level (Dipstick)
| 0L***51 | Bolt Starting Engine Fuel Tank Bracket To Diesel Intake Manifold | 1 |
| 0S***94 | Bolt (1 In. Long 3/8 In. Dia.); Plate Assembly To Support Assembly | 2 |
| 11***68 | Seal-O-Ring; (15.54mm Id) | 1 |
4n-2646 Lines Gp-Engine Oil
| 0L***43 | Bolt 63.5 mm (3/8" X 2 1/2" -Cover Assembly To Fender | 1 |
| 0L***52 | Capscrew (3/8 - 16 Nc X 3 1/4 Gd8, Hex) | 2 |
| 0L***70 | Bolt (2-1/4") Filler Tube Assembly To Transfer Drive Case | 3 |
288-5849 Lines Gp-Engine Oil
| 0L***43 | Bolt 63.5 mm (3/8" X 2 1/2" -Cover Assembly To Fender | 1 |
| 0L***52 | Capscrew (3/8 - 16 Nc X 3 1/4 Gd8, Hex) | 2 |
| 0L***70 | Bolt (2-1/4") Filler Tube Assembly To Transfer Drive Case | 3 |
2w-4685 Lines Gp-Turbocharger Oil
| 0L***43 | Bolt 63.5 mm (3/8" X 2 1/2" -Cover Assembly To Fender | 1 |
| 0S***71 | Screw,Cap,Hexagon; Tube Assembly To Turbocharger And Elbow Mounting | 2 |
| 11***87 | Seal-O-Ring (23.16 mm Id) | 1 |
6n-1030 Pump Gp-Engine Oil
| 12***56 | Cover As-Pump | 1 |
| 1M***44 | Bolt; (3/8-16x2-1/4 In) | 2 |
| 1W***38 | Shaft As-Pump Drive; (8-Teeth) | 1 |
Operator Station
3e-8542 Control Gp-Engine Monitoring
| 3E***42 | Control Group-Engine Monitoring | 1 |
4n-2328 Meter Gp-Service
| 1P***23 | Kit-Meter Window Service; (Window) | 1 |
| 4M***03 | Packing,Preformed Hourmeter Mtg | 1 |
| 4N***28 | Meter Group-Service; Meter Group-Service | 1 |
108-1654 Mounting Gp-Control Panel
| 0S***88 | Bolt,Machine; Hose Assembly Mounting,Hose Assembly To Transmission,And To Torque Converter | 8 |
| 10***54 | Mounting Group-Control Panel | 1 |
| 11***36 | Bracket As-Upper | 1 |
7e-3157 Tachometer Gp-Electric
| 15***74 | Kit-Connecting Plug; (6-Pin)(Cat Electronic Display Harness) | 1 |
| 19***48 | Tachometer Group | 1 |
| 20***68 | Harness As-Sensor; (Tachometer) | 1 |
Service Equipment And Supplies
6l-4502 Chart-Plate & Film
| 3L***26 | Plate-Information; (Compression Ratio)(Install On Lh Side Of Block) | 1 |
| 3N***69 | Tag-Instruction; (Engine Prestart)(English And Spanish) | 1 |
| 3N***90 | Plate Serial Number; On R.H. Rear Bank Of Cylinder Block As Viewed From Rear Of Engine | 1 |
352-9860 Film Gp
| 35***60 | Film Group | 1 |
| 35***91 | Tag | 1 |
| 8L***13 | Strap-Cable(Tie 5.50" Long) | 2 |
G3412C serial number reference
On a Cat gas generator set the engine carries its own serial plate on the engine block (commonly a data plate on the left side, front area). A separate nameplate on the skid frame or control-panel enclosure can carry a package or generator-end serial, which may use a different prefix than the engine serial - do not assume the two are the same number. Most dealer documentation for this model only quotes the engine serial. Read the first three letters as the plant-and-build prefix and the following digits as the sequential build number; the prefix alone does not give a year, so match the full serial against Cat SIS or a dealer parts lookup to pin down the build date.
| Prefix | Identifies | Notes |
|---|---|---|
| CTP | G3412C natural gas engine - generator set application, engine serial number | Engine-block serial number prefix for the Caterpillar G3412C gas generator set, 350-450 kW range, seen on both standard and LE (low-emission) builds. Documented production examples run from the mid-2000s through 2010. Dealer listings for this model typically show only this engine serial; a separate package or generator-end serial number is not consistently documented. |
Frequently asked questions
What engine powers the Cat G3412C generator set?
A Caterpillar G3412C engine: a V-12, four-stroke, spark-ignited natural gas engine displacing 27.0 L (1,649 cu in), with 137 mm x 152 mm (5.4 in x 6.0 in) bore and stroke. It's turbocharged and aftercooled, with a compression ratio that varies by rating package (roughly 8.5:1 to 11.4:1), and runs Cat's Electronic Ignition System paired with either an earlier electronic governor or the later ADEM A4 module depending on build year.
What does the G3412C generator set weigh?
Package dry/shipping weight runs about 6,360-6,500 kg (14,000-14,330 lb) for the common open-skid 375-500 ekW builds, varying with base width and rating package. A narrower-footprint 512 ekW package and enclosed or sound-attenuated versions weigh differently from that baseline - check the build sheet for an exact figure on a specific unit.
What replaced the Cat G3412C?
No single model formally replaced it. Caterpillar kept building G3412 generator sets after this C-suffix generation, and for current oilfield-duty work the newer CG137-12 land production generator set now fills much of the role the G3412C covered. Confirm current availability and the right modern equivalent for your application with a Cat dealer.
What G3412C owners discuss
How sensitive is the G3412C to detonation, and how does the engine protect itself?
This is a lean-burn spark-ignited engine running an excess-air ratio around 1.5-1.8:1 for emissions control and detonation margin. Knock protection is accelerometer-based per cylinder, feeding closed-loop spark timing through the ADEM A4 governor, so the control pulls timing on the specific cylinder showing knock instead of retarding the whole engine. Owners report that once a knock sensor ages or picks up vibration-induced fouling, false knock retard shows up as a slow, hard-to-pin power or efficiency loss that clears after the sensor is replaced or cleaned. Because detonation margin tracks fuel methane number directly, the consensus among people running this platform is that gas-quality drift causes more nuisance knock retard than actual sensor failure, so pull a fuel analysis before condemning hardware. Detonation timing calibration is a governor-mapping item - have your dealer verify any timing changes.
What ignition-system quirks come up in service on the G3412C?
Each cylinder has its own ignition circuit and a prechamber (pre-combustion chamber) spark plug design, where the flame kernel forms shielded from turbulence in the main cylinder before it propagates out. Typical prechamber plug life on this class of lean-burn engine runs in the low thousands of hours, with fuel quality and load factor the biggest swing factors - cycling or light-load service wears plugs noticeably faster than steady heavy load. Sites running mixed or lower-BTU gas report shorter plug life than sites on clean pipeline natural gas. A single going-bad plug tends to show up as a knock-retard fault or an uneven exhaust note rather than an obvious power drop, so cylinder balance or exhaust-temperature checks during a PM visit catch a failing plug before it derates the bank. This is high-voltage ignition work - have your dealer verify plug and coil condition rather than diagnosing live.
Users mention EMCP and ECM communication trouble on this genset - what's going on?
The set carries two separate diagnostic connections: one on the engine ECM, one on the EMCP control panel, and it is common to get a service tool talking to one but not the other. Community troubleshooting order: confirm the diagnostic adapter is powered and grounded off the engine harness (not floating), check the data-link pins at the connector, and if EMCP communicates fine while the ECM side doesn't, suspect the ECM-side harness or connector before blaming the tool. Control-panel generation on this platform varies by vintage and rating package - lower-output or older builds are commonly found with EMCP II or early EMCP 4, while later higher-output packages ship with EMCP 4.3/4.4 - so don't assume one G3412C's panel behavior applies to another without confirming which generation is fitted. For a panel with unresponsive buttons or a stuck fault light, the fix that clears it most of the time is control switch to OFF/RESET, then a battery disconnect of at least 30 seconds before reapplying power; if that doesn't clear it, the panel itself is the suspect.
Is oil consumption or oil condition a known concern on this engine?
Some oil use is expected on gas engines in this class; the real owner concern isn't the top-up rate but what the used-oil analysis trend shows over time. Because the G3412C runs a low-ash oil formulated for gas-fuel service, straight diesel-style TBN depletion tracking doesn't translate cleanly - the practice reported by people running these engines is to watch the TAN/TBN crossover point as the wear signal rather than TBN alone. The commonly quoted baseline drain interval for this class is roughly 750 hours, but sites running a regular sample program routinely stretch or shorten that based on trend data instead of the calendar. A rising trend in silicon, lead, or copper between samples is treated as the real warning sign, more so than the raw consumption number.
What causes reverse-power or paralleling alarms when this genset runs alongside the grid or other sets?
Reverse power or reverse kVAR trips on paralleled or grid-synced Cat sets get blamed on a failed exciter or winding insulation first, but the community troubleshooting order is broader than that. Check exciter brushes and when they were last serviced, verify the magnetic speed pickup on the flywheel isn't fouled with oil or debris (a contaminated pickup skews the speed signal feeding synchronization), and confirm the reverse-power protection setpoint and voltage-regulator settings weren't left wrong from the last commissioning or a control swap. A genuinely bad exciter is only one of several causes and isn't the first thing to assume. Protection setpoints and paralleling logic control fault current and load-shed behavior - have your dealer or control-system tech verify any changes before returning the set to parallel service.
Do these gensets ever hunt or surge in speed, and what's the usual cause?
Speed hunting or surging on large gas gensets is most often traced to the fuel side rather than the governor module itself: an undersized gas supply line, a partially closed valve, or a sticking gas pressure regulator momentarily starves the engine, the governor opens up to compensate, then backs off when flow recovers, and the cycle repeats. Binding in the fuel-control actuator or linkage is the next most common cause - enough internal friction that the return spring can't track smoothly, so the engine hunts until vibration frees the linkage. The reported diagnostic order is to check frequency stability separately at no-load and full-load, pull EMCP/ECM fault history first, then inspect the gas train and actuator linkage before condemning the governor electronics. Work on the gas fuel train is safety-sensitive - have your dealer verify any regulator or actuator adjustment.
What should I check before buying a used G3412C generator set?
Confirm exactly which configuration is fitted. G3412C output and emissions compliance vary by rating package (low-emissions NSPS-compliant builds with Cat-supplied air/fuel ratio control versus standard or export-emissions builds), so match the nameplate rating and emissions certification to what you actually need rather than assuming two listings labeled G3412C are equivalent. Pull service records and oil/coolant sample history if available - a unit with no analysis history is a flag regardless of the hours shown. Confirm which EMCP and ECM control generation is fitted and that both diagnostic ports actually talk to a service tool, since communication trouble is a known headache on this platform and cheap to check before purchase, expensive to chase after. Ask about the fuel quality history at the prior site - a unit that ran on off-spec or variable-methane-number gas is more prone to accelerated ignition-component wear and knock-retard derates even with low hours. Physically, distinguish cosmetic oil seepage from an active rear-main or front-cover leak (large industrial engines weep with age, which isn't automatically disqualifying), and check turbocharger shaft play plus oil in the compressor housing as a quick red flag for bearing wear. Insist on a load-bank test and a real loaded run, not just a no-load start-up, before final purchase. Have your dealer or a qualified gas-engine technician verify condition on anything the records can't confirm.
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
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