Caterpillarengine - industrialindustrial engine
Caterpillar D398
Maintenance schedule, common problems & OEM parts breakdown
The Caterpillar D398 is a stationary/marine power unit, not a complete machine: a V12, four-stroke, turbocharged-and-aftercooled diesel engine of roughly 48.3 liters (2,945 cu in) displacement, built on a 158.8 mm x 203.2 mm (6.25 in x 8 in) bore and stroke, with indirect (precombustion-chamber) injection and a fully mechanical flyball-type governor and fuel system - no ECM, no electronic controls. It has no undercarriage, tracks, or ground-engaging attachments; it was built bare or packaged onto generator ends, marine gearboxes, pump and compressor drives, and drilling/well-service power units. Factory power ratings ranged roughly 750-865 hp (560-645 kW) depending on marine, 50 Hz/60 Hz genset, or industrial duty rating and on the D398/D398A/D398B configuration fitted. Cat built the D398 from the 1950s into the 1970s as the big-bore V12 in a shared-architecture family alongside the smaller-bore D397 (V12) and D379 (V8) and the larger D399 (V16); dry weight of the bare long block runs roughly 6,275-6,715 kg (13,830-14,800 lb), rising to about 7,260 kg (16,000 lb) once packaged with a flywheel housing, radiator, gear-reduction, or generator end.
Across its production life Caterpillar refined the D398 through A and B suffix updates - revised fuel system, cooling, and rating tables layered onto the same bore, stroke, and V12 architecture rather than a clean-sheet redesign - while sharing tooling and many components with the D397 and D399 siblings to cover a wide power band from one engine family. The D398 matters in today's used and parts market because a large population of these mechanical, non-electronic engines is still in service in legacy standby power plants, drilling rigs, marine vessels, and industrial pump and compressor stations, valued precisely because there is no ECM or wiring harness to fail and because the long-stroke design tolerates hard duty and long service intervals. Since the engine is long out of current production and off Cat's active dealer parts lists, the aftermarket runs mainly on independent rebuilders and exchange-core remanufacture of liners, pistons, precombustion chambers, injectors, and fuel-system components rather than new-parts supply.
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 D398 specifications
Engine
| Engine family | D398 V-12 diesel, four-stroke-cycle, turbocharged and aftercooled. Later production carried as D398B and D398B-TA with revised aftercooling; ratings differ by generation and application (marine, generator set, industrial). |
| Displacement | 48.3 L (2,945 cu in) |
| Bore x stroke | 159 mm x 203 mm (6.25 in x 8.00 in) |
| Cylinders | 12, V-12 arrangement, water-cooled |
| Gross power | Approx. 560-634 kW (750-850 hp) at 1200 rpm on base D398/D398B builds; D398B-TA variants reported up to about 645 kW (865 hp) at 1200 rpm. Exact rating varies by duty class (continuous vs standby) and application - treat as a range, not a single figure. |
| Emissions tier | Predates EPA/Tier emissions regulation. Mechanical injection pump feeding precombustion-chamber (indirect) injection, jacket-water aftercooling, no electronic control module. |
Weights
| Bare engine weight | Approx. 6,275-6,715 kg (13,830-14,800 lb) dry, figures vary by source and accessory fit-out |
| Packaged weight | Up to about 7,260 kg (16,000 lb) as installed in a complete generator-set skid with generator end and radiator - this is package weight, not the bare engine |
Dimensions
| Package length x width x height | 3,251 mm x 1,981 mm x 1,422 mm (128 in x 78 in x 56 in), reported for a complete generator-set package (engine, generator end, radiator, base). Bare engine-only envelope dimensions are not separately published in available sources. |
Performance
| Rated speed | 1200 rpm is the standard rating for marine and industrial duty. Some generator-set packages are built for 1800 rpm with 4-pole 60 Hz alternators - this is configuration-specific, not the base engine rating. |
| Generator set output (as installed) | Paired with various generator ends for standby/prime power roughly in the 500-800 kW (625-1,000 kVA) range at 60 Hz, 1200 rpm. Output depends on the generator end selected, not the engine alone - not a fixed engine spec. |
| Fuel consumption / torque | Not documented consistently across available sources - verify against the O&M manual for the specific serial range. |
| Gradeability / travel speed | Not applicable - stationary industrial/marine power unit, no travel function. |
Service capacities (summary)
| Engine oil | Not documented with confidence - sources found for this capacity disagree too widely to publish a reliable figure. Verify against the O&M manual for the specific serial prefix. |
| Cooling system | Radiator-cooled in industrial/genset trim, heat-exchanger cooled in marine trim. Capacity not published in available sources. |
| Fuel system | Industrial configuration typically runs from an external day tank rather than an integral tank - no standard tank capacity published for this configuration. |
| Hydraulic system | Not applicable - engine has no onboard hydraulic system. |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
D398 fluids & capacities
| System | Capacity | Recommended fluid |
|---|---|---|
| Engine crankcase (incl. oil filters) | reported figures diverge sharply, roughly 94 L (25 US gal) in most cross-references, though one field report cites a much larger deep-sump fill near 416 L (110 US gal); treat as varies by sump configuration/series and confirm against the dataplate-matched OMM before ordering fluid | heavy-duty diesel engine oil meeting Cat DEO (or equivalent API CD/CF-class) diesel engine oil specification; multigrade 10W-30 for moderate ambient bands, 15W-40 for warmer climates, straight SAE 30 acceptable on older mechanical fills in stable warm ambients - select grade by coldest expected start-up temperature per the ambient-temperature viscosity chart |
| Cooling system (jacket water) | not confirmed from available public sourcing for this exact serial range - verify with your dealer or the serial-matched OMM cooling-system chart | ethylene-glycol based heavy-duty coolant with corrosion/cavitation inhibitor; later service fills commonly move to Cat ELC (Extended Life Coolant, organic acid technology, no supplemental additive needed); on older mechanical fills a conventional inhibited coolant with periodic SCA top-up is the OMM-era default - do not mix ELC with conventional coolant |
| Fuel system | the D398 is a bare industrial/marine engine block with no integrated fuel tank in the OMM; day-tank or supply-tank sizing is set by the installer/genset or vessel builder, not the engine spec sheet | clean, filtered diesel fuel per Cat fuel specification (No. 2-D or equivalent distillate diesel); water/sediment drained daily from the primary filter/separator |
| Grease (spec only) | per external application (fan hub, linkage, and governor drive points) - no fixed reservoir volume applies | Cat multipurpose grease, NLGI grade 2, lithium-complex or equivalent EP grease for external mechanical linkage and bearing points |
Capacities are refill values from factory literature — always fill to the dipstick/sight gauge, not the number.
Caterpillar D398 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 D398 beyond the schedule
Predictive Maintenance & Fluid Analysis
With no ECM or fault codes, the D398 is monitored through oil and coolant trending instead of diagnostics. Run scheduled oil analysis for wear metals off the wet-liner block, gear-type oil pump, and precombustion-chamber area, and track coolant SCA/nitrite level to catch liner pitting before it perforates. Log boost pressure, exhaust-temperature spread across the V12's two banks, and turbocharger bearing play over time - a slow drift in any of these on this mechanically governed engine is the earliest warning of wear, well before a hard failure shows up.
Corrective & Common Repairs
Common D398 corrective work centers on the mechanical fuel system: decarbonizing or replacing precombustion chambers after carbon fouling, resetting injector timing and rack synchronization when starting turns hard or smoke increases, and rebuilding the engine-driven gear oil pump when pressure sags. Turbocharger and aftercooler core repairs address boost and intake-restriction loss. On marine and genset packages, raw-water pump impeller wear and heat-exchanger tube-bundle fouling from mineral-laden water are recurring corrective jobs.
Overhaul & Rebuild Points
Overhaul on the D398's long-stroke (203 mm) wet-liner V12 centers on liner, piston, and ring renewal once compression or blow-by passes factory limits, plus main and rod bearing inspection given the engine's torque loading. Precombustion chambers, injector nozzles, and the mechanical governor are typically reconditioned or exchanged as a set rather than piecemeal. Because current parts supply runs through independent rebuilders rather than Cat's active dealer network, plan overhaul timing around exchange-core availability for the fuel system and turbocharger, not new-parts lead time.
Seasonal & Environment Servicing
Before cold layup, drain or protect raw-water cooling circuits on marine and genset D398 packages to prevent jacket-water and heat-exchanger freeze damage, and keep jacket-water heaters running on standby units so the mechanical governor and fuel system aren't cold-starting from ambient. In hot, dusty, or drilling-rig service, shorten air cleaner and aftercooler core cleaning intervals - this turbocharged, aftercooled V12 is more sensitive to intake restriction and charge-air fouling than a naturally aspirated engine of the same era.
D398 common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| 8M-3120 | Element --Starting Engine Air Cleaner | Air intake service | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
D398 attachments & work tools
Generator-set arrangement
D398 packaged as a genset prime mover, rated in the roughly 500-750 hp (370-560 kW) range at 1200 rpm depending on generator end and voltage/frequency selection (60 Hz, 480V three-phase common). Comes with a governor (Woodward EG3P family typical) for speed/frequency control, radiator-cooled standard, and a 24V electric starter with dry-type air cleaner.
Marine propulsion arrangement
Turbocharged, aftercooled V12 rated around 850 hp at 1200 rpm for marine main/auxiliary propulsion duty. Supplied complete with a marine reverse-reduction gearbox; forward/reverse ratios vary by gearbox model selected for the vessel. Cooling offered as heat-exchanger-cooled or keel-cooled depending on hull type, not a ground-engaging option.
Industrial/pump-drive arrangement
Base industrial engine arrangement used to drive pumps, compressors, or other stationary loads. Front accessory drive supports different engine rotation options, and flywheel housing is offered in a standard SAE size to mate with the driven equipment's coupling.
Cooling package options
Radiator-cooled is the standard package for industrial and genset use, with remote-radiator mounting available for tight installations. Marine variants add heat-exchanger-cooled or keel-cooled circuits in place of the radiator, matched to the vessel's cooling water source.
Starting and control options
Standard fit is a 24-volt electric starting system with a dry-type air cleaner; governor selection differs by duty (mechanical/hydraulic governors for constant-speed genset work vs variable-speed governing for marine and pump-drive service).
All D398 assemblies by section
Every catalogued assembly group for the Caterpillar D398. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Attachments
5l9945 Aftercooler Connections Group--Full Flow--Type 1
| 5L***45 | Aftercooler Connections Group | 1 |
5l9945 Aftercooler Connections Group--Full Flow--Type 2
| 5L***45 | Aftercooler Connections Group | 1 |
5l6639 Rack Shut-Off Group--Air Actuated
| 5L***39 | Air Actuated Rack Shut-Off Group | 1 |
5l5908 Air Cleaner And Exhaust Manifold Group
| 5L***08 | Air Cleaner And Exhaust Manifold Group | 1 |
6l2610 Air Cleaner Assembly--Heavy Duty
| 6L***10 | Air Cleaner As | 1 |
6l8413 Air Cleaner Diaphragm Replacement Group
| 6L***13 | Air Cleaner Diaphragm Replacement Group | 1 |
6l2611 Air Cleaner Group--Heavy Duty--Type 4
| 6L***11 | Air Cleaner Group | 1 |
6l2611 Air Cleaner Group--Heavy Duty--Type 3
| 6L***11 | Air Cleaner Group | 1 |
6l3851 Air Cleaner Group--Heavy Duty
| 6L***51 | Air Cleaner Group | 1 |
6l2611 Air Cleaner Group--Heavy Duty--Type 1
| 6L***11 | Air Cleaner Group | 1 |
6l2611 Air Cleaner Group--Heavy Duty--Type 2
| 6L***11 | Air Cleaner Group | 1 |
6l5833 Air Cleaner Indicator Group
| 6L***33 | Air Cleaner Indicator Group | 1 |
5l7650 Air Cleaner Support Group--Factory Installation--Type 3
| 5L***50 | Air Cleaner Support Group | 1 |
5l7650 Air Cleaner Support Group--Factory Installation--Type 2
| 5L***50 | Air Cleaner Support Group | 1 |
5l7650 Air Cleaner Support Group--Type 1
| 5L***50 | Air Cleaner Support Group | 1 |
5l4214 Air Filter Indicator Group
| 5L***14 | Air Filter Indicator Group | 1 |
6l5681 Air Precleaner Group--Type 2
| 6L***81 | Air Precleaner Group | 1 |
6l5681 Air Precleaner Group--Type 1
| 6L***81 | Air Precleaner Group | 1 |
6f7691 Air Receiver Group--28 Cubic Foot Capacity
| 6F***91 | Air Receiver Group | 1 |
6l2804 Air Starting Group--L.H.--S.A.E. Standard Engine Rotation--Type 1
| 6L***04 | Air Starting Group | 1 |
6l2803 Air Starting Group--R.H.--S.A.E. Opposite Engine Rotation--Type 2
| 6L***03 | Air Starting Group | 1 |
6l2801 Air Starting Group--R.H.--S.A.E. Standard Engine Rotation--Second Type
| 6L***01 | Air Starting Group | 1 |
6l2804 Air Starting Group--L.H.--S.A.E. Standard Engine Rotation--Type 2
| 6L***04 | Air Starting Group | 1 |
6l8417 Air Starting Group--R.H.--S.A.E. Opposite Standard Engine Rotation--Replaces 6l2803
| 6L***17 | Air Starting Group | 1 |
6l2802 Air Starting Group--L.H.--S.A.E. Opposite Engine Rotation--Type 2
| 6L***02 | Air Starting Group | 1 |
6l2803 Air Starting Group--R.H.--S.A.E. Opposite Engine Rotation--Type 1
| 6L***03 | Air Starting Group | 1 |
6l2802 Air Starting Group--L.H.--Clockwise Engine Rotation--Type 1
| 6L***02 | Air Starting Group | 1 |
6l2801 Air Starting Group--R.H.--Counterclockwise Engine Rotation--Type 1
| 6L***01 | Air Starting Group | 1 |
5l2717 Air Starting Installation Group--L.H.--Type 2
| 5L***17 | Air Starting Installation Group | 1 |
5l8148 Air Starting Installation Group--R.H.--Second Type
| 5L***48 | Air Starting Installation Group | 1 |
5l8148 Air Starting Installation Group--R.H.--Type 1
| 5L***48 | Air Starting Installation Group | 1 |
5l2717 Air Starting Installation Group--L.H.
| 5L***17 | Air Starting Installation Group | 1 |
5l1750 Air Starting Motor Assembly--Counterclockwise Engine Rotation
| 5L***50 | Air Starting Motor Assembly | 1 |
5l1243 Alternator Assembly--32 Volt, 60 Ampere--Type 1
| 5L***43 | Alternator As | 1 |
5l1243 Alternator Assembly--32 Volt, 60 Ampere--Type 2
| 5L***43 | Alternator As | 1 |
5l1019 Alternator Group--32 Volt, 60 Ampere--Type 2
| 5L***19 | Alternator Group | 1 |
5l1019 Alternator Group--32 Volt, 60 Ampere--Type 3
| 5L***19 | Alternator Group | 1 |
5l1019 Alternator Group--32 Volt, 60 Ampere
| 5L***19 | Alternator Group | 1 |
2l276 Automatic Start-Stop Panel Assembly--32 Volt
| 2L***76 | Automatic Start | 1 |
5l2066 Auxiliary Drive Group
| 5L***66 | Auxiliary Drive Group | 1 |
5l7680 Auxiliary Drive Group
| 5L***80 | Auxiliary Drive Group | 1 |
Basic Engine Arrangement
| 1F***73 | Rod--Governor Control To Carburetor | 1 |
| 2***A | Pin--Governor Lever To Control Rod | 1 |
| 2H***64 | Oil Pump Assembly | 1 |
Basic Starting Engine Arrangement
| 4L***71 | Ignition System Group | 1 |
| 6L***29 | Carburetor And Air Transfer Pipe Group | 1 |
| 9M***13 | Oil Pump Assembly | 1 |
1l5663 Battery Group--30 Volt, 170 Ampere Hours
| 1L***63 | Battery Group | 1 |
3n4653 Battery--24 Volt, 300 Ampere Hours
| 3N***53 | Battery Group | 1 |
7l7871 Battery--24 Volt, 172 Ampere Hours
| 7L***71 | Battery Group; (24-Volt)(24-Volt) | 1 |
5f5276 Battery Group--30 Volt, 315 Ampere Hours
| 5F***76 | Battery Group | 1 |
6l3360 Blower Fan And Radiator Assembly--110 Degrees F. Ambient Air
| 6L***60 | Blower Fan And Radiator Assembly | 1 |
5l7380 Blower Fan And Radiator Assembly
| 5L***80 | Blower Fan And Radiator Assembly | 1 |
5l7368 Blower Fan And Radiator Assembly
| 5L***68 | Blower Fan And Radiator Assembly | 1 |
6l3372 Blower Fan And Radiator Assembly--125 Degrees F. Ambient Air
| 6L***72 | Blower Fan And Radiator Assembly | 1 |
Camshaft And Governor (7m6088 N/S)
| 7M***88 | Camshaft And Governor | 1 |
Camshaft And Governor
6l2529 Carburetor And Air Transfer Pipe Group
| 6L***29 | Carburetor And Air Transfer Pipe Group | 1 |
5l5905 Carburetor Assembly
| 5L***05 | Carburetor Assembly | 1 |
7m6038 Carburetor Assembly
| 7M***38 | Carburetor Assembly | 1 |
4n4985 Air Start Changeover Group--S.A.E. Standard Engine Rotation--Field Installation
| 4N***85 | Changeover Group | 1 |
4n6019 Air Start Changeover Group--S.A.E. Opposite Standard Engine Rotation--Field Installation
| 4N***19 | Changeover Group | 1 |
1h9435 Clutch And Starter Pinion Control Group
| 1H***35 | Clutch And Starter Pinion Control Group | 1 |
6l6219 Clutch Assembly
| 6L***19 | Clutch Assembly | 1 |
2n7080 Clutch Assembly
| 2N***80 | Clutch Group | 1 |
1l7470 Clutch Group
| 1L***70 | Clutch Group | 1 |
1l7470 Clutch Group--Second Type
| 1L***70 | Clutch Group | 1 |
Complete Gasoline Starting Engine Arrangement
| 1L***70 | Clutch Group | 1 |
| 6L***79 | Fuel System Group | 1 |
| 6L***86 | Starting Engine Installation Group | 1 |
Compression Release Control
Connecting Rod And Piston (8f2938 N/S)--2 Required
| 8F***38 | Connecting Rod And Piston | 1 |
Connecting Rod And Piston--2 Required
5l3693 Governor Control Group--Remote
| 5L***93 | Control Group-Governor | 1 |
7l5479 Generator Coupling Group
| 7L***79 | Coupling Group-Drive | 1 |
5l3395 Flexible Coupling Group--Type 1
| 5L***95 | Coupling Group-Flexible | 1 |
5l3395 Flexible Coupling Group--Type 2
| 5L***95 | Coupling Group-Flexible | 1 |
Crankshaft
Crankshaft (3l8897 N/S)
| 3L***97 | Crankshaft | 1 |
Cylinder Block, Cylinder Head And Valve Mechanism (4l7209 N/S)--Part 2 Of 2
| 4L***09 | Cylinder Block, Cylinder Head And Valve Mechanism | 1 |
Cylinder Block, Cylinder Head And Valve Mechanism--Part 1 Of 2
Cylinder Block, Cylinder Head And Valve Mechanism--Part 2 Of 2
Cylinder Block, Cylinder Head And Valve Mechanism (4l7209 N/S)--Part 1 Of 2
| 4L***09 | Cylinder Block, Cylinder Head And Valve Mechanism | 1 |
6l2211 Tachometer Drive Group
| 6L***11 | Drive Group-Tachometer; Tachometer Drive Group | 1 |
5l7959 Automatic Start-Stop Arrangement
| 1A***15 | Washer- 1.6 mm(.065 In.)Thick | 2 |
| 1B***01 | Nut Generator Line Leads; Nut-Generator Line Leads | 8 |
| 1L***99 | Contactor Oil Pressure | 1 |
6l4665 Electric Starting Motor Assembly--12 Volt
| 6L***65 | Electric Motor Assembly | 1 |
1l6448 Electric Starting Group--12 Volt
| 1L***48 | Electric Starting Group | 1 |
6l5978 Electric Starting Group--12 Volt--Replaces 2l1704
| 6L***78 | Electric Starting Group | 1 |
2l1704 Electric Starting Group--12 Volt
| 2L***04 | Electric Starting Group | 1 |
2l1704 Electric Starting Group--12 Volt--Second Type
| 2L***04 | Electric Starting Group | 1 |
5l2732 Electric Starting Installation Group--32 Volt
| 5L***32 | Electric Starting Installation Group | 1 |
5l2732 Electric Starting Installation Group--32 Volt--Second Type
| 5L***32 | Electric Starting Installation Group | 1 |
5l5355 Electric Starting Motor Assembly--32 Volt
| 5L***55 | Electric Starting Motor Assembly | 1 |
5l4405 Motor Assembly--32 Volt--Counterclockwise Engine Rotation--R.H.--Part 1 Of 2
| 5L***05 | Electric Starting Motor Assembly | 1 |
6l1619 Motor Assembly--12 Volt
| 6L***19 | Electric Starting Motor Assembly | 1 |
8l8204 Electric Starting Motor Assembly--32 Volt--R.H. & L.H.--Part 1 Of 2
| 8L***04 | Electric Starting Motor Assembly | 1 |
8l8204 Electric Starting Motor Assembly--32 Volt--R.H. & L.H.--Part 2 Of 2
| 8L***04 | Electric Starting Motor Assembly | 1 |
5l4405 Motor Assembly--32 Volt--Counterclockwise Engine Rotation--R.H.--Part 2 Of 2
| 5L***05 | Electric Starting Motor Assembly | 1 |
5l1525 Electric Tachometer And Drive Group
| 5L***24 | Electric Tachometer Group | 1 |
| 5L***25 | Electric Tachometer And Drive Group | 1 |
| 5L***01 | Tachometer Drive Group | 1 |
5l1524 Electric Tachometer Group
| 5L***24 | Electric Tachometer Group | 1 |
6l2522 Enclosed Clutch Group
| 6L***22 | Enclosed Clutch Group | 1 |
2l4425 Enclosed Clutch Group
| 2L***25 | Enclosed Clutch Group | 1 |
5l2387 Engine Support Group
| 5L***87 | Engine Support Group | 1 |
5l1980 Fan Drive Group
| 5L***80 | Fan Drive Group | 1 |
3l6834 Fan Group--54 Inch With 4 Inch Blades
| 3L***34 | Fan Group | 1 |
3l6835 Fan Group--54 Inch With 4 Inch Blades
| 3L***35 | Fan Group | 1 |
5l6797 Exhaust Fitting Group--Flexible
| 5L***97 | Fitting Group-Exhaust | 1 |
5l6796 Exhaust Fitting Group--Flexible
| 5L***96 | Fitting Group-Exhaust | 1 |
5l5475 Flywheel Assembly--Counterclockwise Engine Rotation
| 5L***75 | Flywheel Assembly | 1 |
5l5475 Flywheel Assembly--S.A.E. Standard Engine Rotation
| 5L***75 | Flywheel Assembly | 1 |
2l4426 Flywheel Clutch Assembly
| 2L***26 | Flywheel Clutch Assembly | 1 |
Fuel Line Support
6l2579 Fuel System Group
| 6L***79 | Fuel System Group | 1 |
5l2402 Fuel System Group
| 5L***02 | Fuel System Group | 1 |
5l2400 Gasoline Starting Engine Arrangement
| 0S***92 | Bolt--Cover To Flywheel Housing | 3 |
| 1H***35 | Clutch And Starter Pinion Control Group | 1 |
| 1L***70 | Clutch Group | 1 |
5l9894 Instrument Group--12 Volt
| 5L***94 | Gauge Group; -Oil Pressure, Water Temperature | 1 |
5l9895 Instrument Group--24 And 32 Volt
| 5L***95 | Gauge Group; -Engine Oil Pressure, Water Temperature | 1 |
3l4326 Generator--12 Volt, 35 Ampere
| 3L***26 | Generator | 1 |
5l5750 Generator--12 Volt, 35 Ampere
| 5L***50 | Generator Assembly | 1 |
5l2487 Generator Coupling Group
| 5L***87 | Generator Coupling Group | 1 |
5l1978 Generator Group--12 Volt, 35 Ampere--Type 1
| 5L***78 | Generator Group | 1 |
5l1978 Generator Group--12 Volt, 35 Ampere--Type 2
| 5L***78 | Generator Group | 1 |
3l8255 Woodward Governor--Part 1 Of 2
| 3L***55 | Governor | 1 |
3l8255 Woodward Governor--Part 2 Of 2
| 3L***55 | Governor | 1 |
5l7504 Governor Assembly--L.H.
| 5L***04 | Governor Assembly--L.H. | 1 |
Governor Control Chart
5l1819 Governor Control Group--Hydraulic
| 5L***19 | Governor Control Group | 1 |
3l8869 Governor Control Group--Positive Locking
| 3L***69 | Governor Control Group; Governor Control Group Between 72 & 73 | 1 |
4l6811 Governor Control Lever Group
| 4L***11 | Governor Control Lever Group; Governor Control Lever Group Shown Below | 1 |
5l4061 Governor Control Link Assembly
| 5L***61 | Governor Control Link Assembly | 1 |
6l4913 Governor Conversion Group--10% Regulation
| 6L***13 | Governor Conversion Group | 1 |
5l7474 Governor Conversion Group--10 Percent Regulation At 1250 R.P.M.
| 5L***74 | Governor Conversion Group | 1 |
5l9806 Governor Conversion Group--10 Percent Regulation
| 5L***06 | Governor Conversion Group | 1 |
5l7473 Governor Conversion Group--10 Percent Regulation At 1300 R.P.M.
| 5L***73 | Governor Conversion Group | 1 |
5l7472 Governor Conversion Group--3% Regulation At 1000 R.P.M.
| 5L***72 | Governor Conversion Group | 1 |
5l6945 Governor Conversion Group--3% Regulation At 1200 R.P.M.
| 5L***45 | Governor Conversion Group | 1 |
6l2440 Governor Conversion Group--10 Percent Regulation
| 6L***40 | Governor Conversion Group | 1 |
8l8919 Woodward Governor Group
| 8L***19 | Governor Group-Woodward | 1 |
2l6745 Governor Pneumatic Actuator Group
| 2L***45 | Governor Pneumatic Actuator Group | 1 |
2l2040 Generator Coupling Guard Group
| 2L***40 | Guard Group-Coupling | 1 |
4l7604 Control Handle Group
| 4L***04 | Handle Group-Control; Governor Control Handle Group | 1 |
5l6505 Heat Exchanger Assembly--Fresh Water--Type 2
| 5L***05 | Heat Exchanger As | 1 |
5l6505 Heat Exchanger Assembly--Fresh Water--Type 1
| 5L***05 | Heat Exchanger As | 1 |
7l488 Heat Exchanger Assembly
| 7L***88 | Heat Exchanger Assembly | 1 |
5l6503 Heat Exchanger Assembly--Sea Water--First Type
| 5L***03 | Heat Exchanger Assembly | 1 |
5l6504 Heat Exchanger Assembly--Fresh Water--Type 2
| 5L***04 | Heat Exchanger Assembly | 1 |
5l6502 Heat Exchanger Assembly--First Type
| 5L***02 | Heat Exchanger Assembly | 1 |
5l6502 Heat Exchanger Assembly--Sea Water--Second Type
| 5L***02 | Heat Exchanger Assembly | 1 |
7l490 Heat Exchanger Assembly
| 7L***90 | Heat Exchanger Assembly | 1 |
5l6504 Heat Exchanger Assembly--Fresh Water--First Type
| 5L***04 | Heat Exchanger Assembly | 1 |
5l6503 Heat Exchanger Assembly--Sea Water--Second Type
| 5L***03 | Heat Exchanger Assembly | 1 |
Heat Exchanger Chart
8l5342 Heat Exchanger Assembly
| 8L***42 | Heat Exchanger Group | 1 |
7l489 Heat Exchanger Assembly
| 7L***89 | Heat Exchanger Group | 1 |
8l5340 Heat Exchanger Assembly
| 8L***40 | Heat Exchanger Group | 1 |
7l491 Heat Exchanger Assembly
| 7L***91 | Heat Exchanger Group | 1 |
4l4471 Ignition System Group
| 4L***71 | Ignition System Group | 1 |
4l4471 Ignition System Group--Third Type
| 4L***71 | Ignition System Group | 1 |
4l4471 Ignition System Group--Second Type
| 4L***71 | Ignition System Group | 1 |
5l2462 Generator Installation Arrangement--Type 2
| 5L***62 | Installation Ar-Generator | 1 |
5l2462 Generator Installation Arrangement--Type 1
| 5L***62 | Installation Ar-Generator | 1 |
5l2462 Generator Installation Arrangement--Type 4
| 5L***62 | Installation Ar-Generator | 1 |
5l2462 Generator Installation Arrangement--Type 3
| 5L***62 | Installation Ar-Generator | 1 |
4l8747 Instrument And Panel Mounting Group--Type 1
| 4L***47 | Instrument And Panel Mounting Group | 1 |
4l8747 Instrument And Panel Mounting Group--Type 2
| 4L***47 | Instrument And Panel Mounting Group | 1 |
5l7477 Instrument Shut-Off Panel Group--Type 2
| 5L***77 | Instrument Panel Group | 1 |
5l7477 Instrument Shut-Off Panel Group--Type 1
| 5L***77 | Instrument Panel Group | 1 |
5l2592 Starting System Junction Box Group
| 5L***92 | Junction Box Group; Starting System Junction Box Group | 1 |
5b7529 Line Pressure Regulator--2 Required
| 5B***29 | Line Pressure Regulator | 1 |
4l9581 Vernier Control Link Group
| 4L***81 | Link Group | 1 |
4n7556 Air Motor Lubricator Group
| 4N***56 | Lubricator Group-Air Motor | 1 |
3h3171 Air Motor--Counterclockwise Engine Rotation
5f7739 Magnetic Switch
| 5F***39 | Magnetic Switch | 1 |
3s2987 Magneto Assembly
| 3S***87 | Magneto Assembly | 1 |
8m9145 Magneto Assembly
| 8M***45 | Magneto Assembly | 1 |
7m4700 Magneto Assembly
| 7M***00 | Magneto Assembly | 1 |
1s3350 Magneto Assembly
| 1S***50 | Magneto Assembly | 1 |
5l5907 Manifold And Carburetor Group
| 5L***07 | Manifold And Carburetor Group | 1 |
9m7894 Manual Starting Crank Group
| 9M***94 | Manual Starting Crank Group | 1 |
3l2443 Electric Starting Motor--12 Volt
6l6731 Air Starting Motor Assembly--S.A.E. Standard Engine Rotation
| 6L***31 | Motor As-Air | 1 |
5l5354 Electric Starting Motor--32 Volt--Counterclockwise Engine Rotation--L.H.--Part 2 Of 2
| 5L***54 | Motor Assembly--L.H. | 1 |
5l5354 Electric Starting Motor--32 Volt--Counterclockwise Engine Rotation--L.H.--Part 1 Of 2
| 5L***54 | Motor Assembly--L.H. | 1 |
5l7268 Electric Starting Motor--32 Volt--Clockwise Engine Rotation--R.H.--Part 1
| 5L***68 | Motor Assembly--R.H.,Motor Assembly--L.H. | 1 |
5l7268 Electric Starting Motor--32 Volt--Clockwise Engine Rotation--R.H.--Part 2 Of 2
| 5L***82 | Motor Assembly--R.H.,Motor Assembly--L.H. | 1 |
7l6916 Air Starting Motor Group--L.H.--S.A.E. Standard Engine Rotation
| 7L***16 | Motor Group-Air Starting | 1 |
3h3170 Air Motor--Clockwise Engine Rotation
| 3H***70 | Motor Group-Air Starting | 1 |
7l6915 Air Starting Motor Group--L.H.--S.A.E. Opposite Standard Engine Rotation
| 7L***15 | Motor Group-Air Starting | 1 |
7l6913 Air Starting Motor Group--R.H.--S.A.E. Opposite Standard Engine Rotation
| 7L***13 | Motor Group-Air Starting | 1 |
7l6914 Air Starting Motor Group--R.H.--S.A.E. Standard Engine Rotation
| 7L***14 | Motor Group-Air Starting | 1 |
5l2381 Radiator Mounting Group--Front View
| 5L***81 | Mounting Group-Radiator | 1 |
3n4631 Oil Filter Change Indicator--Field Installation
| 3N***31 | Oil Filter Change Indicator | 1 |
2h7664 Oil Pump Assembly--Type 1
| 2H***64 | Oil Pump Assembly | 1 |
9m1713 Oil Pump Assembly
| 9M***13 | Oil Pump Assembly | 1 |
2h7664 Oil Pump Assembly--Type 2
| 2H***64 | Oil Pump Assembly | 1 |
8f256 Air Starting Oiler
7l7366 Overspeed Safety Contactor Group
| 7L***66 | Overspeed Safety Contactor Group | 1 |
6l6220 Enclosed Clutch Group
| 6L***20 | Power Take-Off Group-Rear | 1 |
6l6220 Enclosed Clutch Group--Type 2
| 6L***20 | Power Take-Off Group-Rear | 1 |
5l4157 Air Precleaner Group--Type 2
| 5L***57 | Precleaner Group | 1 |
5l4157 Air Precleaner Group--Full View--Type 1
| 5L***57 | Precleaner Group | 1 |
5l2618 Rack Limit Servo Shaft Group
| 5L***18 | Rack Limit Servo Shaft Group | 1 |
5l8956 Solenoid Shut-Off Group--32 Volt
| 5L***56 | Rack Solenoid Shut-Off Group | 1 |
5l7458 Radiator And Fan Drive Group--Blower--Counterclockwise Engine Rotation--110 Degrees F. Ambient Air--Type 2
| 5L***58 | Radiator And Fan Drive Group | 1 |
5l7482 Radiator And Fan Drive Group--Blower--S.A.E. Standard Rotation--125 Degrees F Ambient Air
| 5L***82 | Radiator And Fan Drive Group | 1 |
5l7458 Radiator And Fan Drive Group--Blower--Counterclockwise Engine Rotation--110 Degrees F. Ambient Air
| 5L***58 | Radiator And Fan Drive Group | 1 |
5l7482 Radiator And Fan Drive Group--Blower--Counterclockwise Engine Rotation--125 Degrees F. Ambient Air--Type 2
| 5L***82 | Radiator And Fan Drive Group | 1 |
5l2451 Radiator Assembly
| 5L***51 | Radiator As | 1 |
5l2382 Radiator Group
| 5L***82 | Radiator Group | 1 |
2n3910 Engine And Generator Support Rails Group
| 2N***10 | Rail Group-Engine & Gen Support | 1 |
4l9620 Engine Support Rails Group
| 4L***20 | Rail Group-Engine Support | 1 |
6l5397 Regulator Assembly--32 Volt
| 6L***97 | Regulator As | 1 |
6l1631 Safety Alarm Contactor Group--Replaces 5l2578
| 6L***31 | Safety Alarm Contactor Group | 1 |
6l1631 Safety Alarm Contactor Group--Type 2
| 6L***31 | Safety Alarm Contactor Group | 1 |
5l2578 Safety Alarm Contactor Group
| 5L***78 | Safety Alarm Contactor Group | 1 |
5l7369 Safety Control Shut-Off Group--R.H.
| 5L***69 | Safety Control Shut-Off Group | 1 |
5l9263 Rack Solenoid Shut-Off Group
| 5L***63 | Safety Rack Solenoid Shut-Off Group | 1 |
5l5493 Safety Shut-Off Group--Manual
| 5L***93 | Safety Shut-Off Group | 1 |
6l2690 Stub Shaft Group--Front Mounted
| 6L***90 | Shaft Group-Stub | 1 |
6l2709 Stub Shaft Group--Rear Mounted
| 6L***09 | Shaft Group-Stub | 1 |
7l6912 Air Silencer And Vapor Arrester Group
| 7L***12 | Silencer Group-Air Starting | 1 |
5l8039 Torque Spring Groups
| 4F***51 | Spacer (.017" Thick) | 2 |
| 4F***52 | Spring (.072" Thick) | 1 |
| 5L***39 | Spring Group-Torque; Torque Spring Group | 1 |
5l7303 Starting Aid Glow Plug Group--32 Volt--Type 4
| 5L***03 | Starting Aid Group | 1 |
5l7303 Starting Aid Glow Plug Group--32 Volt--Type 2
| 5L***03 | Starting Aid Group | 1 |
5l7303 Starting Aid Glow Plug Group--32 Volt--Type 3
| 5L***03 | Starting Aid Group | 1 |
5l7303 Starting Air Glow Plug Group--32 Volt - Type 1
| 5L***03 | Starting Aid Group | 1 |
2l1618 Starting Crank Group
| 2L***18 | Starting Crank Group | 1 |
6l2586 Starting Engine Installation Group
| 0L***70 | Bolt (2-1/4") Filler Tube Assembly To Transfer Drive Case | 2 |
| 0S***87 | Bolt-Bracket Assembly To Timing Gear | 8 |
| 0S***95 | Bolt 1.25 In. (31.75 mm) Long Guard Assemblies To Radiator Guard | 4 |
6l8418 Air Starting Group--R.H.--S.A.E. Standard Engine Rotation--Replaces 6l2801
| 6L***18 | Starting Group-Air | 1 |
6l2748 Electric Starting Group--32 Volt--S.A.E. Opposite Standard Engine Rotation
| 6L***48 | Starting Motor Group-Electric | 1 |
6l2747 Electric Starting Group--32 Volt--S.A.E. Standard Engine Rotation
| 6L***47 | Starting Motor Group-Electric | 1 |
5l2745 Surge Tank And Water Lines Group--Type 2
| 5L***45 | Surge Tank And Water Lines Group | 1 |
5l2745 Surge Tank And Water Lines Group--Type 1
| 5L***45 | Surge Tank And Water Lines Group | 1 |
5l2745 Surge Tank And Water Lines Group--Type 3
| 5L***45 | Surge Tank And Water Lines Group | 1 |
5l8595 Solenoid Switch Assembly--Type 1
| 5L***95 | Switch As-Solenoid | 1 |
5l8595 Solenoid Switch Assembly--Type 2
| 5L***95 | Switch As-Solenoid | 1 |
5l5901 Tachometer Drive Group
| 5L***01 | Tachometer Drive Group | 1 |
7n1269 Terminal Assembly
| 7N***69 | Terminal & Plate As | 1 |
5l6677 Torque Converter Cooler Group
| 5L***77 | Torque Converter Cooler Group | 1 |
5l6678 Torque Converter Output Shaft Governor Group--Type 4
| 5L***78 | Torque Converter Output Shaft Governor Group | 1 |
5l6678 Torque Converter Output Shaft Governor Group--Type 3
| 5L***78 | Torque Converter Output Shaft Governor Group | 1 |
5l6678 Torque Converter Output Shaft Governor Group
| 5L***78 | Torque Converter Output Shaft Governor Group | 1 |
5l6678 Torque Converter Output Shaft Governor Group--Type 2
| 5L***78 | Torque Converter Output Shaft Governor Group | 1 |
5l5779 Torque Spring Groups
| 4F***52 | Spring (.072" Thick) | 1 |
| 5L***79 | Torque Spring Group | 1 |
| 5M***86 | Spacer (.0220" Thick) | 1 |
6l2669 Transmission And Starter Pinion Group--S.A.E. Standard Engine Rotation--Part 1 Of 2
| 6L***69 | Transmission And Starter Pinion Group | 1 |
5l2204 Transmission And Starter Pinion Group--Counterclockwise Engine Rotation--Side View--Part 1 Of 2
| 5L***04 | Transmission And Starter Pinion Group | 1 |
6l2668 Transmission And Starter Pinion Group--S.A.E. Opposite Engine Rotation--Part 2 Of 2
| 6L***68 | Transmission And Starter Pinion Group | 1 |
5l2204 Transmission And Starter Pinion Group--Counterclockwise Engine Rotation--End View--Part 2 Of 2
| 5L***04 | Transmission And Starter Pinion Group | 1 |
5l2205 Transmission And Starter Pinion Group--Clockwise Engine Rotation--Side View--Part 1 Of 2
| 5L***05 | Transmission And Starter Pinion Group | 1 |
6l2668 Transmission And Starter Pinion Group--S.A.E. Opposite Engine Rotation--Part 1 Of 2
| 6L***68 | Transmission And Starter Pinion Group | 1 |
6l2669 Transmission And Starter Pinion Group--S.A.E. Standard Engine Rotation--Part 2 Of 2
| 6L***69 | Transmission And Starter Pinion Group | 1 |
5l2205 Transmission And Starter Pinion Group--Clockwise Engine Rotation--End View--Part 2 Of 2
| 5L***05 | Transmission And Starter Pinion Group | 1 |
8m1780 Turbocharger Assembly--2 Assemblies Required
| 8M***80 | Turbocharger Assembly | 1 |
3s4437 Turbocharger Assembly--2 Required
| 3S***37 | Turbocharger Assembly | 1 |
8m9073 Turbocharger Assembly--2 Required--Type 2
| 8M***73 | Turbocharger Assembly | 1 |
8m9200 Turbocharger Assembly--2 Assemblies Required - Type 1
| 8M***00 | Turbocharger Assembly | 1 |
8m1780 Turbocharger Assembly--2 Assemblies Required--Second Type
| 8M***80 | Turbocharger Assembly | 1 |
8m9187 Turbocharger Assembly--2 Required--Type 2
| 8M***87 | Turbocharger Assembly | 1 |
8m9200 Turbocharger Assembly--2 Required--Type 2
| 8M***00 | Turbocharger Assembly | 1 |
9m3407 Turbocharger Assembly--2 Required--Type 2
| 9M***07 | Turbocharger Assembly | 1 |
8m7149 Turbocharger Assembly--2 Required--Type 2
| 8M***49 | Turbocharger Assembly | 1 |
8m9074 Turbocharger Assembly--2 Required--Type 2
| 8M***74 | Turbocharger Assembly | 1 |
3s4431 Turbocharger Assembly
| 3S***31 | Turbocharger Assembly | 1 |
8m2028 Turbocharger Assembly--2 Assemblies Required--Type 1
| 8M***28 | Turbocharger Assembly | 1 |
8m7148 Turbocharger Assembly--2 Assemblies Required--Type 1
| 8M***48 | Turbocharger Assembly | 1 |
8m9073 Turbocharger Assembly--2 Assemblies Required - Type 1
| 8M***73 | Turbocharger Assembly | 1 |
8m1781 Turbocharger Assembly--2 Assemblies Required--Type 2
| 8M***81 | Turbocharger Assembly | 1 |
3s4438 Turbocharger Assembly--2 Required
| 3S***38 | Turbocharger Assembly | 1 |
3s4435 Turbocharger Assembly--2 Required
| 3S***35 | Turbocharger Assembly | 1 |
8m2028 Turbocharger Assembly--2 Required--Second Type
| 8M***28 | Turbocharger Assembly | 1 |
3s4436 Turbocharger Assembly--2 Required
| 3S***36 | Turbocharger Assembly | 1 |
7m9684 Turbocharger Assembly--2 Assemblies Required
| 7M***84 | Turbocharger Assembly | 1 |
9m5157 Turbocharger Assembly--2 Assemblies Required
| 9M***57 | Turbocharger Assembly | 1 |
8m9187 Turbocharger Assembly--2 Assemblies Required - Type 1
| 8M***87 | Turbocharger Assembly | 1 |
3s4440 Turbocharger Assembly--2 Required
| 3S***40 | Turbocharger Assembly | 1 |
8m1781 Turbocharger Assembly--2 Assemblies Required--First Type
| 8M***81 | Turbocharger Assembly | 1 |
8m9074 Turbocharger Assembly--2 Assemblies Required - Type 1
| 8M***74 | Turbocharger Assembly | 1 |
9m5157 Turbocharger Assembly--2 Assemblies Required--Second Type
| 9M***57 | Turbocharger Assembly | 1 |
8m7147 Turbocharger Assembly--2 Required--Second Type
| 8M***47 | Turbocharger Assembly | 1 |
7m8170 Turbocharger Assembly--2 Assemblies Required--Second Type
| 7M***70 | Turbocharger Assembly | 1 |
3s4430 Turbocharger Assembly--2 Required
| 3S***30 | Turbocharger Assembly | 1 |
9m3407 Turbocharger Assembly--2 Assemblies Required--Type 1
| 9M***07 | Turbocharger Assembly | 1 |
7m9684 Turbocharger Assembly--2 Assemblies Required--Type 1
| 7M***84 | Turbocharger Assembly | 1 |
3s4442 Turbocharger Assembly--2 Required
| 3S***42 | Turbocharger Assembly | 1 |
7m8170 Turbocharger Assembly--2 Required
| 7M***70 | Turbocharger Assembly | 1 |
3s4434 Turbocharger Assembly--2 Required
| 3S***34 | Turbocharger Assembly | 1 |
7m9684 Turbocharger Assembly--2 Required--Type 2
| 7M***84 | Turbocharger Assembly | 1 |
8m1780 Turbocharger Assembly--2 Assemblies Required--Type 1
| 8M***80 | Turbocharger Assembly | 1 |
8m7149 Turbocharger Assembly--2 Assemblies Required
| 8M***49 | Turbocharger Assembly | 1 |
8m2028 Turbocharger Assembly--2 Assemblies Required
| 8M***28 | Turbocharger Assembly | 1 |
3s4433 Turbocharger Assembly--2 Required
| 3S***33 | Turbocharger Assembly | 1 |
8m7148 Turbocharger Assembly--2 Required--Type 2
| 8M***48 | Turbocharger Assembly | 1 |
8m7147 Turbocharger Assembly--2 Assemblies Required
| 8M***47 | Turbocharger Assembly | 1 |
3s4439 Turbocharger Assembly--2 Required
| 3S***39 | Turbocharger Assembly | 1 |
7m8170 Turbocharger Assembly--2 Assemblies Required--Type 1
| 7M***70 | Turbocharger Assembly | 1 |
6l4234 Turbocharger Group--Type 3
| 6L***34 | Turbocharger Group | 1 |
6l4234 Turbocharger Group
| 6L***34 | Turbocharger Group | 1 |
6l4234 Turbocharger Group--Type 2
| 6L***34 | Turbocharger Group | 1 |
6l4235 Turbocharger Group
| 6L***35 | Turbocharger Group | 1 |
6l4236 Turbocharger Group--Type 1
| 6L***36 | Turbocharger Group | 1 |
3s4419 Turbocharger Assembly
| 3S***19 | Turbocharger Group; Turbocharger Assembly | 1 |
2n8815 Crankcase Explosion Relief Valve Arrangement
| 2N***15 | Valve Ar-Explosion Relief | 1 |
7l6911 Air Starting Valve Group
| 7L***11 | Valve Group-Air Starting | 1 |
1l2073 Pressure Reducing Regulating Valve
| 1L***73 | Valve Group-Pressure Reducing; -Rh | 1 |
3l9922 Whistle Valve
| 3L***22 | Valve Group-Whistle | 1 |
5l2294 Water Lines Group
| 5L***94 | Water Lines Group | 1 |
6l2601 Water Lines Group
| 6L***01 | Water Lines Group | 1 |
2l1630 Water Pump Group
| 2L***30 | Water Pump Group | 1 |
5l9941 Water Temperature And Oil Pressure Shut-Off Group
| 5L***41 | Water Temperature And Oil Pressure Shut-Off Group | 1 |
5l7379 Water Temperature And Oil Pressure Safety Shut-Off Group
| 5L***79 | Water Temperature And Oil Pressure Shut-Off Group | 1 |
5l5947 Water Temperature Shut-Off Group
| 5L***47 | Water Temperature Shut-Off Group | 1 |
6l4246 Woodward Governor Assembly
| 6L***46 | Woodward Governor Assembly | 1 |
5l4936 Woodward Governor Group--Type 1
| 5L***36 | Woodward Governor Group | 1 |
5l8036 Woodward Governor Group
| 5L***36 | Woodward Governor Group | 1 |
5l4936 Woodward Governor Group--Type 2
| 5L***36 | Woodward Governor Group | 1 |
5l8036 Woodward Governor Group--Type 2
| 5L***36 | Woodward Governor Group | 1 |
5l8036 Woodward Governor Group--Type 3
| 5L***36 | Woodward Governor Group | 1 |
5l4936 Woodward Governor Group--Type 3
| 5L***36 | Woodward Governor Group | 1 |
Engine
Aftercooler
Aftercooler (4l1146 N/S)
| 4L***46 | Aftercooler | 1 |
4l7643 Aftercooler Assembly
| 4L***43 | Aftercooler Assembly | 1 |
Air Cleaner (4l8637 N/S)--Dry Type--Rear View
| 4L***37 | Air Cleaner; Air Cleaner Group | 1 |
Air Cleaner--Dry Type--Rear View
Air Cleaner
Air Cleaner And Exhaust Pipe--Dry Type
4l4721 Air Cleaner Assembly
| 4L***21 | Air Cleaner As | 1 |
4l4720 Air Cleaner Group
| 4L***20 | Air Cleaner Group | 1 |
Breather
Camshaft
Carburetor
5l3426 Carburetor Assembly--L.H.
| 5L***26 | Carburetor Assembly--L.H. | 1 |
5l3425 Carburetor Assembly--R.H.
| 5L***25 | Carburetor Assembly--R.H. | 1 |
Carburetor Control
Connecting Rod And Piston--12 Required
Connecting Rod And Piston--10 : 1 Ratio--12 Required
Connecting Rod And Piston--7 : 1 Ratio--12 Required
Connecting Rod And Piston Bearing Replacements
Crankshaft
Cylinder Block And Covers (4l1135 N/S)--Front View--Part 2 Of 2
| 4L***35 | Cylinder Block And Covers | 1 |
Cylinder Block And Covers (4l1135 N/S)--Side View--Part 1 Of 2
| 4L***35 | Cylinder Block And Covers | 1 |
Cylinder Block And Covers--Side View--Part 1 Of 2
Cylinder Block And Covers--Front View--Part 2 Of 2
Cylinder Head And Valve Mechanism--Part 2 Of 2
Cylinder Head And Valve Mechanism--Part 1 Of 2
3n5561 Damper Group
| 3N***61 | Damper Group | 1 |
3n5562 Damper Group
| 3N***62 | Damper Group | 1 |
3n5560 Damper Group
| 3N***60 | Damper Group | 1 |
Flexible Fuel Lines
Flywheel
Front Accessory Drive--Counterclockwise Engine Rotation--Part 2 Of 2
Front Accessory Drive--Counterclockwise Engine Rotation--Part 1 Of 2
Front Accessory Drive--Clockwise Engine Rotation--Part 2 Of 2
Front Accessory Drive--Clockwise Engine Rotation--Part 1 Of 2
Fuel Filter
Fuel Injection Valves And Lines--Top View
Fuel Injection Valves And Lines
6l4813 Fuel Lines Group--Type 2--Field Installation
| 6L***13 | Fuel Lines Group | 1 |
6l4813 Fuel Lines Group--Type 1--Field Installation
| 6L***13 | Fuel Lines Group | 1 |
Fuel Priming Pump
Fuel Pump And Governor Drive--Clockwise Engine Rotation--Part 2 Of 2
Fuel Pump And Governor Drive--Clockwise Engine Rotation--Part 1 Of 2
Fuel Pump And Governor Drive--Counterclockwise Engine Rotation--Part 1 Of 2
Fuel Pump And Governor Drive--Counterclockwise Engine Rotation--Part 2 Of 2
Fuel Pump And Governor Drive--Counterclockwise And Clockwise Engine Rotation--Part 2 Of 2
Fuel Pump And Governor Drive--Counterclockwise And Clockwise Engine Rotation--Part 1 Of 2
Fuel Pump Housing
4l1156 Fuel Transfer Pump Group
| 4L***56 | Fuel Transfer Pump Group | 1 |
Gas Pressure Regulator
5l6452 Gas Pressure Regulator
| 5L***52 | Gas Pressure Regulator | 1 |
Gas Pressure Regulator--Second Type
Governor And Magneto Drive--Part 2 Of 2
Governor And Magneto Drive--Part 1 Of 2
Governor Control
Governor Control (5l8270 N/S)
| 5L***70 | Governor Control | 1 |
Governor Control (4l8614 N/S)
| 4L***14 | Governor Control | 1 |
4l1144 Governor Group--Part 2 Of 2
| 4L***44 | Governor Group | 1 |
4l1144 Governor Group--Part 1 Of 2
| 4L***44 | Governor Group | 1 |
Ignition
4l5852 Inlet Valve And Cover Assembly
| 4L***52 | Inlet Valve And Cover Assembly | 1 |
Instrument And Panel Mounting
Instrument Panel And Mounting
5l9420 Magneto Assembly
| 5L***20 | Magneto Assembly | 1 |
5l6547 Magneto Assembly
| 5L***47 | Magneto Assembly | 1 |
Magneto Drive
Manifolds--Top View
Manifolds (4l1153 N/S)--Top View
| 4L***53 | Manifolds | 1 |
5l3460 Mechanical Governor Group--Part 2 Of 3
| 5L***60 | Mechanical Governor Group | 1 |
5l3460 Mechanical Governor Group--Part 1 Of 3
| 5L***60 | Mechanical Governor Group | 1 |
5l3460 Mechanical Governor Group--Part 3 Of 3
| 5L***60 | Mechanical Governor Group | 1 |
Oil Cooler And Lines--Part 2 Of 2
Oil Cooler And Lines--Part 1 Of 2
4l1141 Oil Filter Group
| 4L***41 | Oil Filter Group | 1 |
6l1583 Oil Filter Group
| 6L***83 | Oil Filter Group | 1 |
Oil Pan Base
5l5993 Oil Pump Assembly
| 5L***93 | Oil Pump Assembly | 1 |
5l3022 Oil Pump Assembly
| 5L***22 | Oil Pump Assembly | 1 |
4l8232 Pump--Second Type
| 4L***32 | Pump As-Fuel Priming; Fuel Priming Pump Assembly | 1 |
4l8232 Pump
| 4L***32 | Pump As-Fuel Priming; Fuel Priming Pump Assembly | 1 |
4l8800 Water Pump Group
| 4L***00 | Pump Group-Water; Fresh Water Pump Group | 1 |
5l5356 Raw Water Aftercooler Assembly
| 5L***56 | Raw Water Aftercooler Assembly | 1 |
Raw Water Lines
6l4769 Raw Water Lines Group
| 6L***69 | Raw Water Lines Group; Sea Water Lines Group | 1 |
6l4754 Raw Water Pump Group--Type 1
| 6L***54 | Raw Water Pump Group; Sea Water Pump Group | 1 |
5l1651 Raw Water Pump Group
| 5L***51 | Raw Water Pump Group; Auxiliary Water Pump Group | 1 |
6l4754 Raw Water Pump Group--Type 2
| 6L***54 | Raw Water Pump Group; Sea Water Pump Group | 1 |
5l2591 Regulator Assembly
| 5L***91 | Regulator Assembly | 1 |
5n3090 Elbow Replacement Group--Oil Cooler
| 0L***43 | Bolt 63.5 mm (3/8" X 2 1/2" -Cover Assembly To Fender | 2 |
| 0S***91 | Screw,Cap,Hexagon Bearing Retainer; Part Of Kit P/N 1w***82 | 2 |
| 3L***08 | Spacer-Bracket To Cylinder Block Cover; Spacer Bracket To Cylinder Block Cover | 2 |
4l8129 Safety Control Shut-Off Group--R.H. And L.H.--Part 1 Of 3
| 4L***29 | Safety Control Shut-Off Group | 1 |
4l8129 Safety Control Shut-Off Group--Sectional View Of Housing--Part 2 Of 3
| 4L***29 | Safety Control Shut-Off Group | 1 |
4l8129 Safety Control Shut-Off Group--Sectional View Of Housing--Part 3 Of 3
| 4L***29 | Safety Control Shut-Off Group | 1 |
4l8129 Safety Control Shut-Off Group--L.H.
| 4L***29 | Safety Control Shut-Off Group | 1 |
4l8129 Safety Control Shut-Off Group--R.H. And L.H.
| 4L***29 | Safety Control Shut-Off Group | 1 |
4l8129 Safety Shut-Off Group--R.H. And L.H.--Part 1 Of 3
| 4L***29 | Safety Control Shut-Off Group | 1 |
Service Meter
Service Meter (4l1159 N/S)
| 4L***59 | Service Meter | 1 |
6l2965 Service Meter Group
| 6L***65 | Service Meter Group | 1 |
6l2976 Service Meter Group--Type 1
| 6L***76 | Service Meter Group | 1 |
6l2976 Service Meter Group--Type 2
| 6L***76 | Service Meter Group | 1 |
5l1498 Oil Pressure And Overspeed Housing Group--Part 2 Of 2
| 5L***98 | Shut-Off Group | 1 |
5l1498 Oil Pressure And Overspeed Housing Group--Part 1 Of 2
| 5L***98 | Shut-Off Group | 1 |
5l5503 Tachometer Drive Group
| 5L***03 | Tachometer Drive Group | 1 |
2s2489 Turbocharger Assembly
| 2S***89 | Turbocharger; Turbocharger Assembly | 1 |
8m1783 Turbocharger Assembly--2 Required--Replaced By 3s4432 Shown On Page 28b
| 8M***83 | Turbocharger Assembly | 1 |
8m1783 Turbocharger Assembly--2 Assemblies--Replaced By 3s4432 Shown On Page 28b
| 8M***83 | Turbocharger Assembly | 1 |
3s4432 Turbocharger Assembly--2 Required
| 3S***32 | Turbocharger Assembly | 1 |
Turbocharger Lubrication Valve
Turbocharger Mounting
4l1162 Turbocharger Group--Rear View
| 4L***62 | Turbochargers Group | 1 |
4l1162 Turbochargers Group--Rear View
| 4L***62 | Turbochargers Group | 1 |
Vibration Damper
Water Lines
Self-Regulated Generators
5l4044 Generator--2400 Volt--60 Hertz, 3 Phase--Side View--Part 1 Of 2
| 5L***44 | Generator | 1 |
5l4043 Generator--240-480 Volt--60 Hertz At 1200 R.P.M., 3 Phase--Side View--Part 1 Of 2
| 5L***43 | Generator | 1 |
5l7968 Generator-240-480 Volt, 50 Hertz, 3 Phase--Side View--Part 1 Of 2
| 5L***68 | Generator | 1 |
5l4043 Generator--240-480 Volt--60 Hertz At 1200 R.P.M., 3 Phase--End View--Part 2 Of 2
| 5L***43 | Generator | 1 |
5l7968 Generator--240-480 Volt--50 Hertz, 3 Phase--End View--Part 2 Of 2
| 5L***68 | Generator | 1 |
5l4044 Generator--2400 Volt--60 Hertz, 3 Phase--End View--Part 2 Of 2
| 5L***44 | Generator | 1 |
8f9866 Grease Gun
| 8F***66 | Grease Gun As | 1 |
5l8138 Static Exciter And Regulator Assembly--Part 2 Of 2--Top View--Type 2
| 5L***38 | Static Exciter And Regulator Assembly | 1 |
5l8138 Static Exciter And Regulator Assembly--Part 1 Of 2--Top View--Type 2
| 5L***38 | Static Exciter And Regulator Assembly | 1 |
5l8119 Static Exciter And Regulator Assembly--Part 2 Of 2--Top View--Type 1
| 5L***19 | Static Exciter And Regulator Assembly | 1 |
5l8119 Static Exciter And Regulator Assembly--Part 2 Of 2--Top View--Type 2
| 5L***19 | Static Exciter And Regulator Assembly | 1 |
5l8119 Static Exciter And Regulator Assembly--Part 1 Of 2--Top View--Type 1
| 5L***19 | Static Exciter And Regulator Assembly | 1 |
5l8119 Static Exciter And Regulator Assembly--Part 1 Of 2--Top View--Type 2
| 5L***19 | Static Exciter And Regulator Assembly | 1 |
5l8138 Static Exciter And Regulator Assembly--Part 2 Of 2--Top View--Type 1
| 5L***38 | Static Exciter And Regulator Assembly | 1 |
5l8138 Static Exciter And Regulator Assembly--Part 1 Of 2--Top View--Type 1
| 5L***38 | Static Exciter And Regulator Assembly | 1 |
4l1560 Tool Group
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9s7977 Tool Group
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D398 serial number reference
On these industrial/marine engines the PIN plate is riveted or bolted to the engine block, usually on the right side near the front or on the flywheel housing, and stamped into the block itself nearby as a backup. Read the first three characters as the prefix (letters and/or numbers, e.g. 66B) and the digits that follow as the sequential build number for that range; the prefix alone tells you the engine family/build block, not the individual unit. Where a build range spans both D398 and D398B nameplates, match the prefix against the physical plate rather than assuming which name applies.
| Prefix | Identifies | Notes |
|---|---|---|
| 66B | D398 industrial/generator-set engine (V12, shared range with D398B) | Covers 66B1-up per the factory operator's manual serial range, confirmed on plain D398-nameplate power units and genset packages. Rated around 700 kVA in genset trim. Turbocharged, aftercooled V12, 159mm x 203mm (6.25in x 8in) bore/stroke, about 48.3L displacement. Output listed anywhere from roughly 825 to 850hp at 1200rpm depending on the specific build and era — varies by configuration. Plant/region and exact production years not documented in available prefix references. |
| 75B | D398 industrial/generator-set engine (V12, shared range with D398B) | Covers 75B1-up per parts-catalog serial break. Found on both plain D398-tagged units and packages branded D398 Series B, at genset ratings around 600kW/600kVA. Same base V12 industrial engine as the 66B range. Confirm whether the nameplate reads D398 or D398B before ordering parts, since both show up under this prefix. Plant/region and exact production years not documented in available prefix references. |
| 67B | D398 marine propulsion engine (turbocharged, aftercooled), same range used for D398A/D398B-TA | Confirm with dealer before ordering: this range shows up in official marine parts catalogs under the D398B nameplate, rated near 800-865hp at 1200rpm (varies by source and configuration), while some resale listings tag the same 67B-prefixed engines as plain D398. Treat as a genuine but ambiguous-nameplate prefix — match against the physical data plate rather than assuming which name applies. |
Frequently asked questions
What engine is the Caterpillar D398?
It is the engine itself, not a machine that uses one: a V12, four-stroke diesel of roughly 48.3 liters (2,945 cu in) displacement on a 158.8 mm x 203.2 mm (6.25 in x 8 in) bore and stroke, turbocharged and aftercooled, with indirect precombustion-chamber injection and a fully mechanical governor - no ECM.
What is the D398's operating weight?
There is no vehicle operating weight since the D398 is a bare stationary/marine power unit. Dry weight of the bare long block runs roughly 6,275-6,715 kg (13,830-14,800 lb), rising to about 7,260 kg (16,000 lb) once packaged with a flywheel housing, radiator, gear-reduction, or generator end.
What replaced the Caterpillar D398?
Within its own family, the D398B was the final factory configuration of the D398 line, built alongside the smaller D397 and larger D399. Caterpillar's broader medium-speed industrial and marine engine role was later carried forward by newer large-displacement designs such as the 3600 series, though no single model is documented as a direct one-for-one replacement.
What D398 owners discuss
Does the D398 use direct injection like some later Cat engines claim online?
No. Owners and factory system-operation literature agree the D398 is an indirect-injection design: fuel is pushed by the injection pump through the nozzle valve into a precombustion chamber, not straight into the main chamber. Each precombustion chamber carries its own glow plug (called a heat-start element in Cat literature) to aid cold ignition. Aggregator write-ups that label this family as direct-injected are copying a different Cat engine's spec sheet and are wrong for the D398. Treat any DI claim for this engine as unverified unless it cites the factory manual directly.
What is the biggest cold-start quirk operators mention?
Starting this V12 involves a heat-start circuit (glow plugs in the precombustion chambers) plus a fuel priming step, and on units with dual hand-primer pumps operators found it awkward to work both pumps while also holding the heat-start switch in the "heat" position. A common workaround reported in the field is wiring or wedging the switch on during priming so both hands are free for the pumps. Also expect 24V electrics on an engine this size - 12V starting setups are not typical.
What wear pattern shows up most in bearings and journals?
Main and rod bearing wear is the most frequently cited failure point. Because it's a V12 with two connecting rods sharing each crank journal, those journals see higher combined loading than an inline engine's, and that is where mechanics say to focus attention - listen for a deep knock that changes with load, and check drained oil for bearing metal. Routine oil and filter service with the correct oil grade is the main preventive measure owners point to. Any journal or bearing clearance work is a job for a qualified rebuild shop - have your dealer or overhaul shop verify clearances against spec before returning the engine to service.
Why does an owner see coolant and oil mixing?
This engine uses wet-type cylinder liners that sit in direct contact with jacket coolant, sealed by O-rings/sealing rings at the liner-to-block joint. When those seals age or the liner bore itself develops vertical scoring from ring contact, coolant and oil can cross-contaminate - milky oil or coolant loss with no external leak is the classic symptom. This is treated as routine wear-item maintenance at overhaul, not a design flaw. Have a qualified technician confirm the source before pulling liners, since a cracked liner or block reads the same on a quick check.
Is it normal for the governor to hunt or for genset frequency to wander?
The factory governor arrangement on these engines is mechanical/hydraulic (flyweight and oil-pressure actuated types were both used), and it holds speed well when linkage is tight and springs are correct. Many surviving units in genset service were later fitted with an add-on electronic governor for paralleling duty, and operators note those retrofits can be noticeably sensitive to small load steps if tuning isn't dialed in - that's a setup issue on the retrofit, not evidence the base engine is flawed. If you see frequency wander, check linkage slop and governor adjustment before assuming a bigger problem.
How many hours do these engines typically run before needing an overhaul?
Reports vary, but a commonly cited figure from operators is roughly 20,000 hours before a major overhaul becomes due, with some oil leakage and a bit of oil burning showing up well before that point without being alarming. Running speed on most industrial/genset applications is 1200 rpm, and owners generally regard that as an easy, long-lived duty cycle for this engine family. Treat any single hour figure as a rough guide, not a guarantee - actual life depends heavily on load factor, maintenance history, and whether it was ever run hot or low on coolant.
What should I check before buying a used D398?
Ask for oil analysis history and look for blue exhaust smoke (points to a worn turbo or valve guides/liners), pull a valve cover and listen for bearing knock under load, and check the oil for coolant contamination or metal. Confirm the pre-lube pump (if fitted) actually cycles before start - a dead pre-lube system is a known nuisance failure and increases start-up wear. If the unit was converted to natural gas, ask how the conversion was done and whether compression or timing was altered from stock, since these conversions vary a lot in quality. Finally get hour meter history and last overhaul date, and have a diesel technician familiar with older Cat industrial engines do a compression/leak-down check and inspect the injection pump and precombustion chambers before you commit - don't rely on running sound alone.
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
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