Caterpillarengine - marinemarine engine
Caterpillar D375D
Maintenance schedule, common problems & OEM parts breakdown
The Caterpillar D375D is a Roots-supercharged V8 marine diesel engine, not a mobile machine - it has no chassis, undercarriage, or work tools, and no operating weight in the excavator/dozer sense. Dating to the 1949-era Caterpillar D3xx marine engine family, it displaces 27.2 L (1662 cu in) from a 146 x 203 mm (5.75 x 8.00 in) bore and stroke, rated up to 250 kW (335 hp) maximum at 1200 rpm rated speed, with continuous output estimated near 205 kW (275 hp). It is the supercharged evolution of the naturally aspirated D364, sharing the same basic block and bore/stroke, and sits alongside siblings D337F, D342, D342C, D346, D348, D353C/D/E, D379, and D379A in Caterpillar's vintage marine and industrial engine line. Documented use centers on marine propulsion, including twin counter-rotating installations for torque cancellation on twin-screw vessels, paired with a reduction/reverse gear fitted at installation. No confirmed successor model carries the D375D name forward.
What separates the D375D from the base D364 is the Roots-type blower and the twin oil-bath air cleaners fitted to handle its higher induction airflow, adding roughly 70 hp over the naturally aspirated sibling built from the same iron. Serial prefix 44B is verified specifically for D375D; prefix 43B appears only in a combined vintage service-manual listing and may belong to an earlier build or the base D375/G375 variant, so it should be treated as unconfirmed. Roots blowers were fitted only for a narrow window before Caterpillar moved to turbocharging on later engines, which makes blower-specific hardware a smaller parts pool than the turbo generation that followed. In today's used and parts market the D375D survives mainly as a collector and parts-donor engine for D364/D375-family owners, valued for shared-block components, with sourcing leaning on reman exchange and specialty vintage-diesel suppliers rather than routine dealer parts counters.
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 D375D specifications
Engine
| Engine family | V8 four-stroke-cycle diesel marine engine; supercharged evolution of the naturally aspirated D364 marine engine line |
| Displacement | 27.2 L (1662 cu in) |
| Bore x stroke | 146 mm x 203 mm (5.75 in x 8.00 in) |
| Cylinders | 8, in V configuration |
| Aspiration | Roots-type supercharger; no aftercooling documented for this rating |
| Maximum power | 250 kW (335 hp) |
| Continuous power | Approx. 205 kW (275 hp) at 1200 rpm; figure is an estimated continuous duty rating and varies by source |
| Emissions tier | Pre-dates emissions certification; no tier applies to this design era |
Weights
| Dry weight | Not documented in available factory literature for this engine |
Dimensions
| Engine block dimensions | Not documented in available factory literature for this engine |
Performance
| Rated speed | 1200 rpm (maximum power rating) |
| Torque and duty-cycle ratings | Not documented in available factory literature for this engine |
Service capacities (summary)
| Fuel, oil, and cooling system capacities | Not documented in available factory literature for this engine |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
D375D fluids & capacities
| System | Capacity | Recommended fluid |
|---|---|---|
| Engine crankcase (with filter) | Not documented in publicly available sources for this exact serial range — verify with your dealer or the original OMM | Heavy-duty diesel engine oil per the era's API/Cat oil specification for this engine class. No modern Cat DEO/DEAC brand naming applies — this is a legacy mid-20th-century industrial/marine design predating that branding. Viscosity grade selected by ambient temperature per the OMM's climate chart, typical of the period's straight-grade and early multi-grade oils. |
| Cooling system | Not documented in publicly available sources for this exact serial range — verify with your dealer or the original OMM | Water/ethylene-glycol based coolant per the OMM's mix ratio for the operating climate. Modern Cat ELC (Extended Life Coolant) postdates this engine family and should not be assumed without dealer confirmation of compatibility. |
| Fuel tank | Not documented in publicly available sources — fuel tank capacity for this engine is application-specific (marine vessel or genset skid supplies its own tank, not a Cat-specified factory tank) | Diesel fuel per the OMM's fuel quality and cetane specification for the period. |
| Grease (spec only) | Not applicable — no factory-specified reservoir capacity; applied per lubrication interval chart | Multi-purpose chassis grease (NLGI-graded) per the OMM's lubrication chart, consistent with the wider vintage Cat D3xx industrial/marine engine family conventions. |
Capacities are refill values from factory literature — always fill to the dipstick/sight gauge, not the number.
Caterpillar D375D maintenance schedule
| Service interval | Tasks |
|---|---|
| Every 50 h |
|
| Every 250 h |
|
| Every 500 h |
|
| Every 1,000 h |
|
| Every 2,000 h |
|
| Every 4,000 h |
|
Servicing the D375D beyond the schedule
Predictive maintenance & fluid analysis
No ECM and no fault codes on this 1949-era mechanical V8, so oil sampling and gauge trending carry the load. Pull crankcase samples at each service and watch for fuel or raw-water intrusion and rising bearing wear metals. Track jacket-water and raw-water temperature spread across the cooling circuit, and watch blower discharge and oil-bath air cleaner condition together, since a fouled cleaner or a slipping blower belt shows up as falling boost and rising exhaust pyrometer readings before power visibly drops.
Corrective & common repairs
Recurring complaints on this engine trace to the blower drive and fuel system rather than electronics: worn Roots blower drive gears and seals, sticking precombustion-chamber injectors, and governor linkage wear causing speed hunting are the common repair calls. A missing or mismatched oil-bath air cleaner canister is a sign of an incomplete rebuild, not a factory variation, since both units are specified as a matched pair. Raw-water pump impeller failure after long lay-up is the other frequent call on marine installations.
Overhaul & rebuild points
Major overhaul centers on the blower and the same V8 bottom end shared with the naturally aspirated D364: pull and recondition the Roots blower rotors, bearings, seals, and drive gear as a unit rather than piecemeal, since blower hardware from this era has a narrow parts pool. Gauge cylinder liner wear and ring end gap, recondition main and rod bearings, and rebuild the injection pump and nozzles as a matched set. Verify precombustion-chamber seats against fresh nozzles before reassembly.
Seasonal & environment servicing
Raw-water cooled installations laid up for a season need the raw-water side drained and flushed to prevent scale and corrosion, cylinders fogged, and intake and exhaust openings sealed against humidity before lay-up. Check the raw-water pump impeller and any sacrificial zinc anodes before relaunch, since idle time is the leading cause of impeller cracking. On twin counter-rotating installations, confirm correct rotation matches its paired engine after any winter service, and re-check blower belt tension before returning to service.
D375D common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| 1H-1444 | Transfer--Oil Filter Instructions--1 7/8" High | Lubrication service | Check fitment → |
| 1H-2680 | Transfer--Oil Filter Instructions--1 7/8" High | Lubrication service | Check fitment → |
| 2H-5288 | Filter Assembly | Scheduled service item | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
D375D attachments & work tools
Machine type — no work-tool ecosystem
D375D is a vintage Caterpillar marine diesel engine (prefix 44B), part of the same industrial/marine D3xx family as D353C/D353D/D397D. It is a propulsion power unit, not a machine chassis, so it has no bucket, blade, coupler, or skid-steer/excavator-style work-tool line.
Driveline accessories (engine-class, not attachments)
For this engine class the only bolt-on options are driveline items such as marine reverse/reduction gear and PTO drive provisions for auxiliary loads, fitted at installation by the boatbuilder or engine distributor rather than sold as Cat work tools. Exact ratios and configurations are not documented for this specific engine and vary by vessel and installation — verify with a Cat marine dealer.
Guarding and mounting
Factory options at this class level are limited to engine-mount arrangements (rigid or resilient mounts) and standard shipboard guarding for belts/rotating components; no attachment coupler or quick-hitch system applies since the unit is not paired with ground-engaging or material-handling tools.
All D375D assemblies by section
Every catalogued assembly group for the Caterpillar D375D. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Attachments
7f2872 Accessory Drive Group
| 7F***72 | Accessory Drive Group | 1 |
2f3147 Adapter
| 2F***47 | Adapter | 1 |
3f9847 Tachometer Dual Drive Joint
| 3F***47 | Adapter As-Drive | 1 |
4l1043 Air Cleaner Group--Dry Type--Type 1
| 4L***43 | Air Cleaner Group | 1 |
2l8744 Air Cleaner Group
| 2L***44 | Air Cleaner Group | 1 |
4l1043 Air Cleaner Group--Dry Type--Type 2
| 4L***43 | Air Cleaner Group | 1 |
6h3298 Air Cleaner Group
| 6H***98 | Air Cleaner Group | 1 |
2l7928 Air Inlet Covers Group
| 2L***28 | Air Inlet Covers Group | 1 |
Air Inlet Shut-Off
3l2391 Air Inlet Shut-Off Group
| 3L***91 | Air Inlet Shut-Off Group | 1 |
6f7691 Horizontal Receiver Group
| 6F***91 | Air Receiver Group | 1 |
3h756 Ammeter Group--Pilot House
| 3H***56 | Ammeter Group | 1 |
3h8856 Auxiliary Drive And Bilge Pump Arrangement
| 2H***32 | Auxiliary Drive Group | 1 |
| 3H***56 | Auxiliary Drive And Bilge Pump Arrangement | 1 |
| 8F***78 | Vee Belt | 1 |
7f9387 Auxiliary Drive And Bilge Pump Arrangement
| 1L***87 | Auxiliary Drive Group | 1 |
| 7F***87 | Auxiliary Drive And Bilge Pump Arrangement | 1 |
| 8F***78 | Vee Belt | 1 |
1h6548 Auxiliary Drive Group
| 1H***48 | Auxiliary Drive Group | 1 |
1l1287 Auxiliary Drive Group--Center
| 1L***87 | Auxiliary Drive Group | 1 |
2h7032 Auxiliary Drive Group
| 2H***32 | Auxiliary Drive Group | 1 |
3l9182 Basic Starting Engine Arrangement
| 2H***64 | Oil Pump Assembly | 1 |
| 3L***96 | Ignition System Group | 1 |
| 3L***81 | Manifold And Carburetor Group | 1 |
1l5663 Battery Group--30 Volt--170 Ampere Hours
| 1L***63 | Battery Group | 1 |
5f5276 Battery Group--30 Volt--300 Ampere Hours
| 5F***76 | Battery Group | 1 |
Camshaft
Camshaft And Governor
3l8892 Carburetor
| 3L***92 | Carburetor | 1 |
5h1227 Carburetor
| 5H***27 | Carburetor | 1 |
1h9435 Clutch And Starter Pinion Control Group
| 1H***35 | Clutch And Starter Pinion Control Group | 1 |
1l7470 Clutch Group--Type 2
| 1L***70 | Clutch Group | 1 |
1l7470 Clutch Group--Type 1
| 1L***70 | Clutch Group | 1 |
1l5025 Clutch Assembly
| 1L***25 | Clutch Unit Assembly | 1 |
9f3907 Complete Governor Group
| 9F***07 | Complete Governor Group | 1 |
3l3861 Complete Governor Group--10% Regulation At 1000 R.P.M.
| 3L***61 | Complete Governor Group | 1 |
3l3862 Complete Governor Group--10% Regulation At 1200 To 1225 R.P.M.
| 3L***62 | Complete Governor Group | 1 |
3l4602 Complete Governor Group--10% Regulation At 1000 R.P.M.
| 3L***02 | Complete Governor Group | 1 |
2l1508 Complete Governor Group
| 2L***08 | Complete Governor Group | 1 |
9f3908 Complete Governor Group
| 9F***08 | Complete Governor Group | 1 |
2l4669 Compression Release Control Group
| 2L***69 | Compression Release Control Group | 1 |
Connecting Rod And Piston (2 Groups Req'D.)
3l9698 Connections And Pump Group--Raw Water
| 3L***98 | Connections And Pump Group | 1 |
Crankshaft
3h768 Crankshaft Group
| 3H***68 | Crankshaft Group | 1 |
Cylinder Block, Cylinder Head And Valve Mechanism--Part 2 Of 2
Cylinder Block, Cylinder Head And Valve Mechanism--Part 1 Of 2
2l3762 Cylinder Block, Cylinder Head And Valve Mechanism Group--Part 2 Of 2
| 2L***62 | Cylinder Block Cylinder Head And Valve Mechanism Group; Cylinder Block, Cylinder Head And Valve Mechanism Group | 1 |
2l3762 Cylinder Block, Cylinder Head And Valve Mechanism Group--Part 1 Of 2
| 2L***62 | Cylinder Block Cylinder Head And Valve Mechanism Group; Cylinder Block, Cylinder Head And Valve Mechanism Group | 1 |
2f7448 Cylinder Head And Valve Mechanism Group
| 2F***48 | Cylinder Head And Valve Mechanism Group | 1 |
3l1398 Cylinder Head And Water Cooled Manifold Group--Type 1
| 3L***98 | Cylinder Head And Water Cooled Manifold Group | 1 |
3l1398 Cylinder Head And Water Cooled Manifold Group--
| 3L***98 | Cylinder Head And Water Cooled Manifold Group | 1 |
3l1398 Cylinder Head And Water Cooled Manifold Group--Part 1 Of 2--Type 2
| 3L***98 | Cylinder Head And Water Cooled Manifold Group | 1 |
9f740 Discharger
| 9F***40 | Discharger Group | 1 |
2l514 Electric Starting Arrangement--Counterclockwise Engine Rotation
| 1L***64 | Bracket--Switch | 1 |
| 2A***90 | Machine Screw--Switch To Bracket | 2 |
| 2L***14 | Electric Starting Arrangement | 1 |
2l515 Electric Starting Arrangement--Clockwise Engine Rotation
| 1L***64 | Bracket--Switch | 1 |
| 2A***90 | Machine Screw--Switch To Bracket | 2 |
| 2L***15 | Electric Starting Arrangement | 1 |
2l1704 Electric Starting Group--12 Volt--Type 1
| 2L***04 | Electric Starting Group | 1 |
2l1704 Electric Starting Group--12 Volt--Type 2
| 2L***04 | Electric Starting Group | 1 |
2l1705 Electric Starting Group--6 Volt--Type 2
| 2L***05 | Electric Starting Group | 1 |
2l1705 Electric Starting Group--6 Volt--Type 1
| 2L***05 | Electric Starting Group | 1 |
2l1702 Electric Starting Motor
| 2L***02 | Electric Starting Motor | 1 |
2l1703 Electric Starting Motor
| 2L***03 | Electric Starting Motor | 1 |
4l1689 Electric Tachometer Group
| 4L***89 | Electric Tachometer Group | 1 |
4l1705 Electric Tachometer Group--Replaces 3l2579
| 2F***47 | Adapter | 1 |
| 4L***89 | Electric Tachometer Group | 1 |
| 4L***05 | Electric Tachometer Group | 1 |
3l2579 Electric Tachometer Group
| 1L***61 | Electric Tachometer Group | 1 |
| 2F***47 | Adapter | 1 |
| 3L***79 | Electric Tachometer Group | 1 |
1l6461 Electric Tachometer Group
| 1L***61 | Electric Tachometer Group | 1 |
2l1166 Ether Starting Aid Group--L.H.
| 2L***66 | Ether Starting Aid Group (L.H.) | 1 |
2l1172 Ether Starting Aid Group--L.H.
| 2L***72 | Ether Starting Aid Group (L.H.) | 1 |
2l1171 Ether Starting Aid Group--R.H.
| 2L***71 | Ether Starting Aid Group (R.H.) | 1 |
2l1165 Ether Starting Aid Group--R.H.
| 2L***65 | Ether Starting Aid Group (R.H.) | 1 |
8f4154 Expansion Tank Group--Large Capacity
| 8F***54 | Expansion Tank-Group | 1 |
3l8899 Flame Arrester, Breather And Exhaust Manifold Group
| 3L***99 | Flame Arrester, Breather And Exhaust Manifold Group | 1 |
2l5617 Flywheel Assembly--Diesel Engine
| 2L***17 | Flywheel Assembly; Flywheel Assembly--Diesel Engine | 1 |
2l1647 Flywheel Assembly--Diesel Engine
| 2L***47 | Flywheel Assembly; Flywheel Assembly--Diesel Engine | 1 |
7f2624 Front Power Take-Off Group--1 : 1 Ratio--Type 2
| 7F***24 | Front Power Take-Off Group | 1 |
7f2624 Front Power Take-Off Group--Type 1
| 7F***24 | Front Power Take-Off Group | 1 |
3l4830 Fuel Priming Pump Group--L.H.--Replaces 2l998
| 3L***30 | Fuel Priming Pump Group | 1 |
3l1514 Fuel Priming Pump Group--R.H. (Replaces 2l993)--Type 2
| 3L***14 | Fuel Priming Pump Group | 1 |
2l998 Fuel Priming Pump Group--L.H.
| 2L***98 | Fuel Priming Pump Group | 1 |
2l993 Fuel Priming Pump Group--R.H.
| 2L***93 | Fuel Priming Pump Group | 1 |
3l4827 Fuel Priming Pump Group--R.H.--Replaces 3l1514
| 3L***27 | Fuel Priming Pump Group | 1 |
1l578 Fuel Priming Pump Group--L.H.
| 1L***78 | Fuel Priming Pump Group | 1 |
3l1514 Fuel Priming Pump Group--Flexible Lines--R.H.--Type 1--Replaces 2l993
| 3L***14 | Fuel Priming Pump Group | 1 |
1l7022 Fuel Priming Pump Group--L.H.--(Replaces 1l578)
| 1L***22 | Fuel Priming Pump Group--L.H. | 1 |
3l4828 Fuel Priming Pump Group--L.H.--Replaces 1l7022
| 3L***28 | Fuel Priming Pump Group--L.H. | 1 |
2h7161 Fuel System Group
| 2H***61 | Fuel System Group | 1 |
2l5611 Gasoline Starting Engine Arrangement--Clockwise Rotation
| 0S***92 | Bolt--Cover To Flywheel Housing | 3 |
| 1H***35 | Clutch And Starter Pinion Control Group | 1 |
| 1L***02 | Support Group; Engine Support Group | 1 |
2l1637 Gasoline Starting Engine Arrangement--Counterclockwise Rotation
| 0S***92 | Bolt--Cover To Flywheel Housing | 3 |
| 1H***35 | Clutch And Starter Pinion Control Group | 1 |
| 1L***02 | Support Group; Engine Support Group | 1 |
2h1049 Gear Group--R.H.--1.95 : 1 Ratio
| 2H***49 | Gear Group | 1 |
6f6696 Generator--32 Volt--15 Ampere
| 6F***96 | Generator | 1 |
8f4595 Generator--6 Volt--30 Ampere
| 8F***95 | Generator | 1 |
2l508 Generator Group--6 Volt--30 Ampere--Type 1
| 2L***08 | Generator Group | 1 |
2l510 Generator Group--32 Volt--15 Ampere
| 2L***10 | Generator Group | 1 |
2l508 Generator Group--6 Volt, 30 Ampere--Type 2
| 2L***08 | Generator Group | 1 |
2h7432 Glow Plug Arrangement
| 2H***32 | Glow Plug Arrangement | 1 |
| 2H***33 | Transformer | 1 |
| 2H***37 | Glow Plug Group | 1 |
1l7412 Glow Plug Group--32 Volt Part 2 Of 2
| 1L***12 | Glow Plug Group | 1 |
1l7412 Glow Plug Group--32 Volt Part 1 Of 2
| 1L***12 | Glow Plug Group | 1 |
2h7437 Glow Plug Group
| 2H***37 | Glow Plug Group | 1 |
3l7215 Governor Conversion Group--10% Regulation At 1200 R.P.M.
| 3L***15 | Governor Conversion Group | 1 |
3l7216 Governor Conversion Group--10% Regulation At 1000 R.P.M.
| 3L***16 | Governor Conversion Group | 1 |
8f2746 Governor Group
| 8F***46 | Governor Group | 1 |
1l2807 Governor Pneumatic Actuator Group--Type 1
| 1L***07 | Governor Pneumatic Actuator Group | 1 |
1l2807 Governor Pneumatic Actuator Group--Type 2
| 1L***07 | Governor Pneumatic Actuator Group | 1 |
1l2795 Governor Remote Control Group--R.H.--Type 2
| 1L***95 | Governor Remote Control Group | 1 |
1l2796 Governor Remote Control Group--L.H.--Type 2
| 1L***96 | Governor Remote Control Group | 1 |
1l2795 Governor Remote Control Group--R.H.--Type 1
| 1L***95 | Governor Remote Control Group | 1 |
1l2796 Governor Remote Control Group--L.H.--Type 1
| 1L***96 | Governor Remote Control Group | 1 |
2l2530 Heat Exchanger Group
| 2L***30 | Heat Exchanger Assembly | 1 |
2l7227 Heat Exchanger Assembly
| 2L***27 | Heat Exchanger Assembly | 1 |
3l8896 Ignition System Group
| 3L***96 | Ignition System Group | 1 |
2l1636 Ignition System Group
| 2L***36 | Ignition System Group | 1 |
2l891 Instrument And Panel Mounting Group--R.H.
| 2L***91 | Instrument And Panel Mounting Group | 1 |
2l892 Instrument And Panel Mounting Group--L.H.
| 2L***92 | Instrument And Panel Mounting Group | 1 |
1l6905 Instrument Panel Group
| 1L***05 | Instrument Panel Group | 1 |
6f9032 Junction Box Group--Type 2
| 6F***32 | Junction Box Group | 1 |
6f9032 Junction Box Group--Type 1
| 6F***32 | Junction Box Group | 1 |
2l2361 Keel Cooling Connections Group
| 2L***61 | Keel Cooling Connections Group | 1 |
2l2482 Keel Cooling System Arrangement
| 2L***56 | Oil Cooler Group | 1 |
| 2L***61 | Keel Cooling Connections Group | 1 |
| 2L***82 | Keel Cooling System Arrangement | 1 |
3h3171 Air Motor--Counterclockwise Engine Rotation
5f7739 Magnetic Switch
| 5F***39 | Magnetic Switch | 1 |
8f5871 Magneto
| 8F***71 | Magneto | 1 |
9h6374 Magneto Assembly
| 9H***74 | Magneto Assembly | 1 |
3l9181 Manifold And Carburetor Group
| 3L***81 | Manifold And Carburetor Group | 1 |
3l1031 Water Cooled Exhaust Manifold Group
| 3L***31 | Manifold Group-Exhaust | 1 |
2l1641 Manifold, Carburetor And Breather Group
| 2L***41 | Manifold, Carburetor And Breather Group | 1 |
2l8197 Marine Gear Assembly--Part 1 Of 3--2.19 : 1 Ratio--Type 2
| 2L***97 | Marine Gear Assembly | 1 |
2l8197 Marine Gear Assembly--Part 2 Of 3--2.19 : 1 Ratio--Type 2
| 2L***97 | Marine Gear Assembly | 1 |
2l8197 Marine Gear Assembly--Part 3 Of 3--2.19 : 1 Ratio--Type 2
| 2L***97 | Marine Gear Assembly | 1 |
1l4506 Electric Starting Motor--32 Volt
6f4463 Electric Starting Motor
3l2443 Motor--12 Volt--Replaces 2l1702
3l2444 Motor--6 Volt--Replaces 2l1703
1l5098 Motor--24 Volt--Clockwise Rotation (Replaces 6f4463)
6f285 Motor And Wiring Group--Counterclockwise Engine Rotation (Rear View)--Part 2 Of 2--Type 1
| 6F***89 | Motor And Wiring Group Group | 1 |
6f285 Motor And Wiring Group--24 Volt--Counterclockwise Engine Rotation--Side View--Part 2 Of 2--Type 2
| 6F***89 | Motor And Wiring Group Group | 1 |
6f285 Motor And Wiring Group--24 Volt--Counterclockwise Engine Rotation--
| 6F***89 | Motor And Wiring Group Group | 1 |
6f285 Motor And Wiring Group--Counterclockwise Engine Rotation (Side View)--Part 1 Of 2--Type 1
| 6F***89 | Motor And Wiring Group Group | 1 |
3h3247 Air Starting Motor Assembly--Counterclockwise Engine Rotation
| 3H***47 | Motor Assembly | 1 |
3h3170 Air Motor--Clockwise Engine Rotation
| 3H***70 | Motor Group-Air Starting | 1 |
2l9473 Muffler Group
| 2L***73 | Muffler Group | 1 |
2l7283 Muffler Group
| 2L***83 | Muffler Group | 1 |
2l7281 Muffler Group
| 2L***81 | Muffler Group | 1 |
3l8524 Oil Cooler Group--Keel Cooling--Type 2
| 3L***24 | Oil Cooler Group | 1 |
2l1551 Oil Cooler Group
| 2L***51 | Oil Cooler Group | 1 |
2l1556 Oil Cooler Group
| 2L***56 | Oil Cooler Group | 1 |
2h7664 Oil Pump Assembly
| 2H***64 | Oil Pump Assembly | 1 |
8f256 Oiler
4l1688 Instrument Panel Group--Replaces 1l6905
| 4L***88 | Panel Group-Instrument | 1 |
8f2184 Pump
3l3848 Pump Assembly
| 3L***48 | Pump Assembly | 1 |
1l506 Pump Assembly
| 1L***06 | Pump Assembly | 1 |
2l1549 Raw Water Pump Group--Type 2
| 2L***49 | Raw Water Pump Group | 1 |
2l1549 Raw Water Pump Group--Type 1
| 2L***49 | Raw Water Pump Group | 1 |
3l9697 Raw Water Pump Group
| 3L***97 | Raw Water Pump Group | 1 |
2l2481 Raw Water System Arrangement
| 2L***49 | Raw Water Pump Group | 1 |
| 2L***51 | Oil Cooler Group | 1 |
| 2L***81 | Raw Water System Arrangement | 1 |
3l9699 Raw Water System Arrangement--Replaces 2l2481
| 2L***51 | Oil Cooler Group | 1 |
| 3L***98 | Connections And Pump Group | 1 |
| 3L***99 | Raw Water System Arrangement | 1 |
3h2273 Regulator--32 Volt
| 3H***73 | Regulator | 1 |
4h8598 Regulator--6 Volt
| 4H***98 | Regulator | 1 |
7h841 Regulator Assembly--6 Volt
| 7H***41 | Regulator Assembly | 1 |
1m2382 Regulator Assembly--6 Volt, 30 Ampere
| 1M***82 | Regulator Assembly | 1 |
Relay And Element Assemblies
1l2800 Remote Air Actuated Governor Control Group--L.H.
| 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 | 1 |
| 1A***29 | Bolt (1-1/8") Tube Assembly To Transfer Drive Case | 4 |
1l2799 Remote Air Actuated Governor Control Group--R.H.
| 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 | 1 |
| 1A***29 | Bolt (1-1/8") Tube Assembly To Transfer Drive Case | 4 |
2l6733 Safety Alarm Group--R.H.
| 2L***33 | Safety Alarm Group | 1 |
2l6735 Safety Alarm Group--Circuit Normally Closed (R.H.)
| 2L***35 | Safety Alarm Group | 1 |
2l6734 Safety Alarm Group--L.H.
| 2L***34 | Safety Alarm Group | 1 |
2l1638 Safety Drip Collector Group
| 2L***38 | Safety Drip Collector Group | 1 |
3l8877 Safety Drip Collector Group
| 3L***77 | Safety Drip Collector Group | 1 |
8f3269 Silencer And Vapor Arrester Group--L.H.
| 8F***69 | Silencer And Vapor Arrester Group | 1 |
2l3665 Silencer And Vapor Arrester Group
| 2L***65 | Silencer And Vapor Arrestor Group | 1 |
2l1618 Starting Crank Group
| 2L***18 | Starting Crank Group | 1 |
3l2454 Starting Engine Arrangement--Counterclockwise Engine Rotation
| 0S***92 | Bolt--Cover To Flywheel Housing | 3 |
| 1H***35 | Clutch And Starter Pinion Control Group | 1 |
| 1L***02 | Support Group; Engine Support Group | 1 |
3l8924 Starting Engine Arrangement--Counterclockwise Engine Rotation
| 0S***92 | Bolt--Cover To Flywheel Housing | 3 |
| 1H***35 | Clutch And Starter Pinion Control Group | 1 |
| 1L***02 | Support Group; Engine Support Group | 1 |
7f2290 Air Starting Motor Group--Counterclockwise Engine Rotation
| 7F***89 | Starting Motor Group | 1 |
8f4185 Foot Valve And Strainer Assembly
| 8F***85 | Strainer As; Foot Valve And Strainer Assembly | 1 |
1l4469 Crankshaft Stub Shaft Group--Front
| 1L***69 | Stub Shaft Group | 1 |
7f2740 Sump Pump
| 7F***40 | Sump Pump | 1 |
1l6902 Support Group--Type 2
| 1L***02 | Support Group; Engine Support Group | 1 |
1l6902 Support Group--Type 1
| 1L***02 | Support Group; Engine Support Group | 1 |
3f1006 Switch
| 3F***06 | Switch; (Elec. Horn) | 1 |
1l7720 Tachometer And Cable Group--Engine Mounted (L.H.)
| 1L***20 | Tachometer And Cable Group | 1 |
1l7721 Tachometer And Cable Group--Engine Mounted (R.H.)
| 1L***21 | Tachometer And Cable Group | 1 |
1l1348 Top Auxiliary Drive Arrangement
| 1H***48 | Auxiliary Drive Group | 1 |
| 1L***48 | Top Auxiliary Drive Arrangement | 1 |
| 7F***72 | Accessory Drive Group | 1 |
1l9704 Transmission And Starter Pinion Group--Side View--Part 2 Of 2
| 1L***04 | Transmission And Starter Pinion Group | 1 |
2l2816 Transmission And Starter Pinion Group--Rear View--Part 1 Of 2
| 2L***16 | Transmission And Starter Pinion Group | 1 |
1l9704 Transmission And Starter Pinion Group--Rear View--Part 1 Of 2
| 1L***04 | Transmission And Starter Pinion Group | 1 |
2l2816 Transmission And Starter Pinion Group--Side View--Part 2 Of 2
| 2L***16 | Transmission And Starter Pinion Group | 1 |
8h1555 Turbocharger Assembly--926-1000 R.P.M.
| 8H***55 | Turbocharger Assembly | 1 |
8h1553 Turbocharger Assembly--1226-1300 R.P.M.
| 8H***53 | Turbocharger Assembly | 1 |
8h1557 Turbocharger Assembly--800-825 R.P.M.
| 8H***57 | Turbocharger Assembly | 1 |
8h1554 Turbocharger Assembly--1001-1100 R.P.M.
| 8H***54 | Turbocharger Assembly | 1 |
8h1556 Turbocharger Assembly--826-925 R.P.M.
| 8H***56 | Turbocharger Assembly | 1 |
1l2073 Regulating Valve
| 1L***73 | Valve Group-Pressure Reducing; -Rh | 1 |
3h3225 Balanced Whistle Valve
| 3H***25 | Valve-Whistle | 1 |
2l1619 Water Lines Group
| 2L***19 | Water Lines Group | 1 |
2l1630 Water Pump Group
| 2L***30 | Water Pump Group | 1 |
Diesel Engine
2l8744 Air Cleaner Group
| 2L***44 | Air Cleaner Group | 1 |
Air Inlet Shut-Off
2l3381 Air Inlet Shut-Off Arrangement
| 2L***81 | Air Inlet Shut-Off Arrangement | 1 |
2l2320 Air Inlet Shut-Off Group
| 2L***20 | Air Inlet Shut-Off Group | 1 |
Balancer
7h1556 Balancer Group--Field Changeover (Front)
| 7H***56 | Balancer Group | 1 |
7h1557 Balancer Group--Field Changeover (Rear)
| 7H***57 | Balancer Group | 1 |
Basic Governor--Part 2 Of 2
Basic Governor--Part 1 Of 2
2l1249 Basic Governor Group--Part 2 Of 2
| 2L***49 | Basic Governor Group | 1 |
3l3857 Basic Governor Group--Part 2 Of 2
| 3L***57 | Basic Governor Group | 1 |
3l4609 Basic Governor Group--Part 2 Of 2
| 3L***09 | Basic Governor Group | 1 |
2l1249 Basic Governor Group--Part 1 Of 2
| 2L***49 | Basic Governor Group | 1 |
3l3857 Basic Governor Group--Part 1 Of 2
| 3L***57 | Basic Governor Group | 1 |
3l4609 Basic Governor Group--Part 1 Of 2
| 3L***09 | Basic Governor Group | 1 |
6f584 Blower Group--Counterclockwise Engine Rotation
| 6F***84 | Blower Group | 1 |
6f6845 Blower Group--Clockwise Engine Rotation
| 6F***45 | Blower Group | 1 |
1h5913 Breather Group
| 1H***13 | Breather Group | 1 |
4h1973 Breather Group
| 4H***73 | Breather Group | 1 |
6h1774 Breather Group
| 6H***74 | Breather Group | 1 |
1h5914 Breather Group
| 1H***14 | Breather Group | 1 |
Camshaft
3l7217 Complete Governor Group--Part 1 Of 2
| 3L***17 | Complete Governor Group | 1 |
3l7217 Complete Governor Group--Part 2 Of 2
| 3L***17 | Complete Governor Group | 1 |
3l4603 Complete Governor Group--10% Regulation At 1100 To 1225 R.P.M.
| 3L***03 | Complete Governor Group | 1 |
3l3860 Complete Governor Group--10% Regulation At 1100 To 1200 R.P.M.
| 3L***60 | Complete Governor Group | 1 |
1l9832 Complete Governor Group
| 1L***32 | Complete Governor Group | 1 |
9f3909 Complete Governor Group
| 9F***09 | Complete Governor Group | 1 |
Connecting Rod And Piston (8 Groups Req'D.)
Connecting Rod And Piston--8 Required
Crankshaft
Crankshaft Bearing Replacement Group
Cylinder Block And Covers--Front View
Cylinder Block And Covers--Side View--Part 1 Of 2
Cylinder Block And Covers--Front View--Part 2 Of 2
Cylinder Block And Covers--Side View
Cylinder Block And Covers--End View--Part 2 Of 2
Cylinder Block And Covers Group--Side View--Part 1 Of 2
Cylinder Head And Valve Mechanism
Cylinder Head Assembly (4 Req'D.)
2l3442 Engine Base Group
| 2L***42 | Engine Base Group | 1 |
Exhaust Manifold Shield
Exhaust Pipe Guard
Flywheel
1h7875 Fresh Water Pump Group
| 1H***75 | Fresh Water Pump Group | 1 |
Front Accessory Drive--Front View Part 1 Of 2
Front Accessory Drive--Side View Part 2 Of 2
Fuel Filter
Fuel Injection Valves And Lines
Fuel Pump And Governor Drive
Fuel Pump Housing
2h7670 Fuel Transfer Pump And Oil Pump Assembly--Counterclockwise Engine Rotation
| 2H***71 | Fuel Transfer Pump And Oil Pump Assembly | 1 |
6h6710 Fuel Transfer Pump Group
| 6H***10 | Fuel Transfer Pump Group | 1 |
9h1374 Full Flow Oil Filter Group--Front Mounted--Field Changeover
| 9H***74 | Full Flow Oil Filter Group | 1 |
9h1375 Full Flow Oil Filter Group--Side Mounted--Field Changeover
| 9H***75 | Full Flow Oil Filter Group | 1 |
7h3525 Hour Meter And Tachometer Drive Group--Counterclockwise Rotation
| 7H***25 | Hour Meter And Tachometer Drive Group | 1 |
6f9333 Intercooler Group
| 6F***33 | Intercooler Group | 1 |
6h3084 Manifold Group
| 6H***84 | Manifold Group | 1 |
6h1988 Manifold Group
| 6H***88 | Manifold Group | 1 |
Manifolds
8h7110 Oil Filter Group--Full Flow--Front Mounted
| 8H***10 | Oil Filter Group | 1 |
7h3278 Oil Filter Group--Reservoir Type
| 7H***78 | Oil Filter Group | 1 |
8f6650 Oil Filter Group
| 8F***50 | Oil Filter Group | 1 |
4l4754 Oil Filter Group--Full Flow
| 4L***54 | Oil Filter Group | 1 |
6h5868 Oil Filter Group--Front Mounted
| 6H***68 | Oil Filter Group | 1 |
7f8940 Oil Filter Group--Reservoir Type
| 7F***40 | Oil Filter Group | 1 |
Oil Lines--Part 1 Of 2
Oil Lines--Part 2 Of 2
6f6133 Oil Pump Group--Counterclockwise Rotation
| 6F***33 | Oil Pump Group | 1 |
7f3465 Oil Pump Group--Clockwise Rotation
| 7F***65 | Oil Pump Group | 1 |
Oil Pump Idler Gear
Rear Accessory Drive
2l330 Rear Accessory Drive Group
| 2L***30 | Rear Accessory Drive Group | 1 |
Silencer
Sump Pump
6f9682 Tachometer Drive Group--Clockwise Rotation
| 6F***82 | Tachometer Drive Group | 1 |
1f3286 Tachometer Drive Group--Counterclockwise Rotation
| 1F***86 | Tachometer Drive Group | 1 |
7h4199 Turbocharger Assembly
| 7H***99 | Turbocharger Assembly | 1 |
6h1811 Turbocharger Assembly
| 6H***11 | Turbocharger Assembly | 1 |
9h4526 Turbocharger Cartridge Group--Field Replacement
| 9H***26 | Turbocharger Cartridge Group | 1 |
Turbocharger Oil Filter
Water Cooled Exhaust Manifold--Part 2 Of 2
Water Cooled Exhaust Manifold--Part 1 Of 2
Water Lines
Marine Gears
3l5699 Air Control Group--Single Lever--Replaces 2l1677
| 3L***99 | Air Control Group; Single Lever Air Control Group | 1 |
1l9992 Air Cylinder Assembly
| 1L***92 | Air Cylinder Assembly | 1 |
3l8031 Connections And Mounting Group
| 3L***31 | Connections And Mounting Group | 1 |
2h7349 Controlair--Pilot House
| 2H***49 | Controlair | 1 |
2h5288 Filter Assembly
| 2H***88 | Filter Assembly | 1 |
2h1045 Gear Assembly--Part 1 Of 3
| 2H***45 | Gear Assembly | 1 |
2h1047 Gear Assembly--Part 2 Of 3
| 2H***47 | Gear Assembly | 1 |
2l9421 Gear Assembly--R.H.--3.92 : 1 Ratio--Part 3 Of 3
| 2L***21 | Gear Assembly | 1 |
3l5727 Gear Assembly--L.H.--1.95 : 1 Ratio--Part 1 Of 3--Replaces 2l9424
| 3L***27 | Gear Assembly | 1 |
2l9419 Gear Assembly--R.H.--2.93 : 1 Ratio--Part 1 Of 3
| 2L***19 | Gear Assembly | 1 |
2h1043 Gear Assembly--Part 1 Of 3
| 2H***43 | Gear Assembly | 1 |
2l9420 Gear Assembly--L.H.--2.93 : 1 Ratio--Part 1 Of 3
| 2L***20 | Gear Assembly | 1 |
2h1047 Gear Assembly--Part 1 Of 3
| 2H***47 | Gear Assembly | 1 |
2h1046 Gear Assembly--Part 3 Of 3
| 2H***46 | Gear Assembly | 1 |
2h1044 Gear Assembly--Part 1 Of 3
| 2H***44 | Gear Assembly | 1 |
2h1048 Gear Assembly--Part 2 Of 3
| 2H***48 | Gear Assembly | 1 |
2l9424 Gear Assembly--L.H.--1.95 : 1 Ratio--Part 2 Of 3
| 2L***24 | Gear Assembly | 1 |
2l9422 Gear Assembly--L.H.--3.92 : 1 Ratio--Part 3 Of 3
| 2L***22 | Gear Assembly | 1 |
3l5728 Gear Assembly--R.H.--2.93 : 1 Ratio--Part 2 Of 3--Replaces 2l9419
| 3L***28 | Gear Assembly | 1 |
2h1048 Gear Assembly--Part 1 Of 3
| 2H***48 | Gear Assembly | 1 |
2l9420 Gear Assembly--L.H.--2.93 : 1 Ratio--Part 3 Of 3
| 2L***20 | Gear Assembly | 1 |
2h1044 Gear Assembly--Part 3 Of 3
| 2H***44 | Gear Assembly | 1 |
2h1043 Gear Assembly--Part 3 Of 3
| 2H***43 | Gear Assembly | 1 |
2l9422 Gear Assembly--L.H.--3.92 : 1 Ratio--Part 1 Of 3
| 2L***22 | Gear Assembly | 1 |
2h1046 Gear Assembly--Part 1 Of 3
| 2H***46 | Gear Assembly | 1 |
2h1044 Gear Assembly--Part 2 Of 3
| 2H***44 | Gear Assembly | 1 |
3l5726 Gear Assembly--R.H.--1.95 : 1 Ratio--Part 1 Of 3--Replaces 2l9423
| 3L***26 | Gear Assembly | 1 |
2l9421 Gear Assembly--R.H.--3.92 : 1 Ratio--Part 1 Of 3
| 2L***21 | Gear Assembly | 1 |
2l9420 Gear Assembly--L.H.--2.93 : 1 Ratio--Part 2 Of 3
| 2L***20 | Gear Assembly | 1 |
2l9421 Gear Assembly--R.H.--3.92 : 1 Ratio--Part 2 Of 3
| 2L***21 | Gear Assembly | 1 |
2h1046 Gear Assembly--Part 2 Of 3
| 2H***46 | Gear Assembly | 1 |
3l5729 Gear Assembly--2.93 : 1 Ratio--Part 3 Of 3--Replaces 2l9420
| 3L***29 | Gear Assembly | 1 |
2h1048 Gear Assembly--Part 3 Of 3
| 2H***48 | Gear Assembly | 1 |
2h1047 Gear Assembly--Part 3 Of 3
| 2H***47 | Gear Assembly | 1 |
3l5726 Gear Assembly--R.H.--1.95 : 1 Ratio--Part 3 Of 3--Replaces 2l9423
| 3L***26 | Gear Assembly | 1 |
3l5730 Gear Assembly--R.H.--3.92 : 1 Ratio--Part 3 Of 3--Replaces 2l9421
| 3L***30 | Gear Assembly | 1 |
2l9419 Gear Assembly--R.H.--2.93 : 1 Ratio--Part 2 Of 3
| 2L***19 | Gear Assembly | 1 |
3l5730 Gear Assembly--R.H.--3.92 : 1 Ratio--Part 2 Of 3--Replaces 2l9421
| 3L***30 | Gear Assembly | 1 |
2h1045 Gear Assembly--Part 2 Of 3
| 2H***45 | Gear Assembly | 1 |
2h1043 Gear Assembly--Part 2 Of 3
| 2H***43 | Gear Assembly | 1 |
2l9423 Gear Assembly--R.H.--1.95 : 1 Ratio--Part 3 Of 3
| 2L***23 | Gear Assembly | 1 |
2l9422 Gear Assembly--L.H.--3.92 : 1 Ratio--Part 2 Of 3
| 2L***22 | Gear Assembly | 1 |
2l9424 Gear Assembly--L.H.--1.95 : 1 Ratio--Part 3 Of 3
| 2L***24 | Gear Assembly | 1 |
2l9419 Gear Assembly--R.H.--2.93 : 1 Ratio--Part 3 Of 3
| 2L***19 | Gear Assembly | 1 |
2h1045 Gear Assembly--Part 3 Of 3
| 2H***45 | Gear Assembly | 1 |
3l5727 Gear Assembly--L.H.--1.95 : 1 Ratio--Part 2 Of 3--Replaces 2l9424
| 3L***27 | Gear Assembly | 1 |
3l5729 Gear Assembly--L.H.--2.93 : 1 Ratio--Part 1 Of 3--Replaces 2l9420
| 3L***29 | Gear Assembly | 1 |
2l9423 Gear Assembly--R.H.--1.95 : 1 Ratio--Part 1 Of 3
| 2L***23 | Gear Assembly | 1 |
3l5728 Gear Assembly--R.H.--2.93 : 1 Ratio--Part 3 Of 3--Replaces 2l9419
| 3L***28 | Gear Assembly | 1 |
2l9424 Gear Assembly--L.H.--1.95 : 1 Ratio--Part 1 Of 3
| 2L***24 | Gear Assembly | 1 |
3l5728 Gear Assembly--R.H.--2.93 : 1 Ratio--Part 1 Of 3--Replaces 2l9419
| 3L***28 | Gear Assembly | 1 |
3l5730 Gear Assembly--R.H.--3.92 : 1 Ratio--Part 1 Of 3--Replaces 2l9421
| 3L***30 | Gear Assembly | 1 |
3l5731 Gear Assembly--L.H. 3.92 : 1 Ratio--Part 2 Of 3--Replaces 2l9422
| 3L***31 | Gear Assembly | 1 |
3l5731 Gear Assembly--L.H.--3.92 : 1 Ratio--Part 3 Of 3--Replaces 2l9422
| 3L***31 | Gear Assembly | 1 |
2l9423 Gear Assembly--R.H.--1.95 : 1 Ratio--Part 2 Of 3
| 2L***23 | Gear Assembly | 1 |
3l5726 Gear Assembly--R.H.--1.95 : 1 Ratio--Part 2 Of 3--Replaces 2l9423 Specification No. 26882
| 3L***26 | Gear Assembly | 1 |
3l5729 Gear Assembly--L.H.--2.93 : 1 Ratio--Part 2 Of 3--Replaces 2l9420
| 3L***29 | Gear Assembly | 1 |
3l5731 Gear Assembly--L.H.--3.92 : 1 Ratio--Part 1 Of 3--Replaces 2l9422
| 3L***31 | Gear Assembly | 1 |
3l5727 Gear Assembly--L.H.--1.95 : 1 Ratio--Part 3 Of 3--Replaces 2l9424
| 3L***27 | Gear Assembly | 1 |
2h1053 Gear Group--R.H.--3.92 : 1 Ratio
| 2H***53 | Gear Group | 1 |
2h1052 Gear Group--L.H.--2.93 : 1 Ratio
| 2H***52 | Gear Group | 1 |
2h1051 Gear Group--R.H.--2.93 : 1 Ratio
| 2H***51 | Gear Group | 1 |
2h1054 Gear Group--L.H.--3.92 : 1 Ratio
| 2H***54 | Gear Group | 1 |
2h1050 Gear Group--L.H.--1.95 : 1 Ratio
| 2H***50 | Gear Group | 1 |
8f9866 Grease Gun--Type 2
| 8F***66 | Grease Gun As | 1 |
8f9866 Grease Gun--Type 1
| 8F***66 | Grease Gun As | 1 |
2l2609 Keel Cooling System Lines Group--Type 1
| 2L***09 | Keel Cooling System Lines Group | 1 |
2l2609 Keel Cooling System Lines Group--Type 2
| 2L***09 | Keel Cooling System Lines Group | 1 |
3l8843 Marine Gear Arrangement--4.08 : 1 Ratio--Keel Cooled
| 2L***99 | Marine Gear Assembly | 1 |
| 3L***31 | Connections And Mounting Group | 1 |
| 3L***24 | Oil Cooler Group | 1 |
3l8840 Marine Gear Arrangement--3.03 : 1 Ratio--
| 2L***98 | Marine Gear Assembly | 1 |
| 3L***31 | Connections And Mounting Group | 1 |
| 3L***34 | Oil Cooler Group | 1 |
3l8839 Marine Gear Arrangement--2.19 : 1 Ratio--Keel Cooled
| 2L***97 | Marine Gear Assembly | 1 |
| 3L***31 | Connections And Mounting Group | 1 |
| 3L***24 | Oil Cooler Group | 1 |
3l8841 Marine Gear Arrangement--3.03 : 1 Ratio--Keel Cooled
| 2L***98 | Marine Gear Assembly | 1 |
| 3L***31 | Connections And Mounting Group | 1 |
| 3L***24 | Oil Cooler Group | 1 |
3l8838 Marine Gear Arrangement--2.19 : 1 Ratio--
| 2L***97 | Marine Gear Assembly | 1 |
| 3L***31 | Connections And Mounting Group | 1 |
| 3L***34 | Oil Cooler Group | 1 |
3l8842 Marine Gear Arrangement--4.08 : 1 Ratio--
| 2L***99 | Marine Gear Assembly | 1 |
| 3L***31 | Connections And Mounting Group | 1 |
| 3L***34 | Oil Cooler Group | 1 |
3l9942 Marine Gear Assembly--Part 2 Of 3 3.03 : 1 Ratio
| 3L***42 | Marine Gear Assembly | 1 |
3l9943 Marine Gear Assembly--Part 2 Of 3 4.09 : 1 Ratio
| 3L***43 | Marine Gear Assembly | 1 |
2l8199 Marine Gear Assembly--Part 3 Of 3--4.08 : 1 Ratio
| 2L***99 | Marine Gear Assembly | 1 |
2l8197 Marine Gear Assembly--Part 3 Of 3--2.19 : 1 Ratio
| 2L***97 | Marine Gear Assembly | 1 |
2l8197 Marine Gear Assembly--Part 2 Of 3--2.19 : 1 Ratio
| 2L***97 | Marine Gear Assembly | 1 |
3l9941 Marine Gear Assembly--Part 2 Of 3 2.19 : 1 Ratio
| 3L***41 | Marine Gear Assembly | 1 |
2l8198 Marine Gear Assembly--Part 2 Of 3--3.03 : 1 Ratio
| 2L***98 | Marine Gear Assembly | 1 |
2l8198 Marine Gear Assembly--Part 3 Of 3--3.03 : 1 Ratio
| 2L***98 | Marine Gear Assembly | 1 |
3l9941 Marine Gear Assembly--Part 3 Of 3 2.19 : 1 Ratio
| 3L***41 | Marine Gear Assembly | 1 |
3l9942 Marine Gear Assembly--Part 1 Of 3 3.03 : 1 Ratio
| 3L***42 | Marine Gear Assembly | 1 |
3l9942 Marine Gear Assembly--Part 3 Of 3 3.03 : 1 Ratio
| 3L***42 | Marine Gear Assembly | 1 |
2l8199 Marine Gear Assembly--Part 1 Of 3--4.08 : 1 Ratio
| 2L***99 | Marine Gear Assembly | 1 |
3l9943 Marine Gear Assembly--Part 1 Of 3 4.09 : 1 Ratio
| 3L***43 | Marine Gear Assembly | 1 |
2l8199 Marine Gear Assembly--Part 2 Of 3--4.08 : 1 Ratio
| 2L***99 | Marine Gear Assembly | 1 |
2l8197 Marine Gear Assembly--Part 1 Of 3--2.19 : 1 Ratio
| 2L***97 | Marine Gear Assembly | 1 |
2l8198 Marine Gear Assembly--Part 1 Of 3--3.03 : 1 Ratio
| 2L***98 | Marine Gear Assembly | 1 |
3l9941 Marine Gear Assembly--Part 1 Of 3 2.19 : 1 Ratio
| 3L***41 | Marine Gear Assembly | 1 |
3l9943 Marine Gear Assembly--Part 3 Of 3--4.09 : 1 Ratio
| 3L***43 | Marine Gear Assembly | 1 |
2l9462 Mounting And Water Lines Group--L.H.--Type 3
| 2L***62 | Mounting And Water Lines Group | 1 |
2l9461 Mounting And Water Lines Group--R.H.--Type 2
| 2L***61 | Mounting And Water Lines Group | 1 |
2l9461 Mounting And Water Lines Group--R.H.--Type 1
| 2L***61 | Mounting And Water Lines Group | 1 |
2l9462 Mounting And Water Lines Group--L.H.--Type 1
| 2L***62 | Mounting And Water Lines Group | 1 |
2l9461 Mounting And Water Lines Group--R.H.--Type 3
| 2L***61 | Mounting And Water Lines Group | 1 |
2l9462 Mounting And Water Lines Group--L.H.--Type 2
| 2L***62 | Mounting And Water Lines Group | 1 |
2l2608 Mounting Group
| 2L***08 | Mounting Group | 1 |
2l2607 Mounting Group
| 2L***07 | Mounting Group | 1 |
Name Plates And Transfers
| 1F***58 | Plate-- Engine Information | 1 |
| 1H***63 | Plate Serial Number | 1 |
| 1H***44 | Transfer--Oil Filter Instructions--1 7/8" High | 1 |
3l5904 Oil Cooler Assembly
| 3L***04 | Oil Cooler Assembly | 1 |
2h5225 Oil Cooler Assembly
| 2H***25 | Oil Cooler Assembly | 1 |
2l9425 Oil Cooler Assembly
| 2L***25 | Oil Cooler Assembly | 1 |
3l8034 Oil Cooler Group--Raw Water--Type 1
| 3L***34 | Oil Cooler Group | 1 |
3l8524 Oil Cooler Group--Keel Cooling
| 3L***24 | Oil Cooler Group | 1 |
3l8034 Oil Cooler Group--Raw Water--Type 2
| 3L***34 | Oil Cooler Group | 1 |
2l4455 Pump Assembly
| 2L***55 | Pump Assembly | 1 |
2l2611 Raw Water System Lines Group
| 2L***11 | Raw Water Lines Group | 1 |
2l2611 Raw Water Lines Group--Type 2
| 2L***11 | Raw Water Lines Group | 1 |
7f2513 Reduction Gear Assembly--R.H.--3 : 1 Ratio
| 7F***13 | Reduction Gear Assembly | 1 |
7f2511 Reduction Gear Assembly--R.H.--2 : 1 Ratio
| 7F***11 | Reduction Gear Assembly | 1 |
7f7531 Reduction Gear Assembly--3.9 : 1 Ratio
| 7F***31 | Reduction Gear Assembly | 1 |
4f6941 Release Valve
| 4F***41 | Release Valve Assembly | 1 |
8f4377 Reverse Gear Assembly--Part 1 Of 2
| 8F***77 | Reverse Gear Assembly | 1 |
8f4377 Reverse Gear Assembly--Part 2 Of 2
| 8F***77 | Reverse Gear Assembly | 1 |
1l7537 Reverse Gear Control Group--R.H. Type 4
| 1L***37 | Reverse Gear Control Group | 1 |
1l7538 Reverse Gear Control Group--L.H.--Type 4
| 1L***38 | Reverse Gear Control Group | 1 |
1l7537 Reverse Gear Control Group--R.H.--Type 1
| 1L***37 | Reverse Gear Control Group | 1 |
1l7537 Reverse Gear Control Group--R.H.--Type 2
| 1L***37 | Reverse Gear Control Group | 1 |
1l7538 Reverse Gear Control Group--L.H.--Type 1
| 1L***38 | Reverse Gear Control Group | 1 |
1l7538 Reverse Gear Control Group--L.H.--Type 5
| 1L***38 | Reverse Gear Control Group | 1 |
1l7537 Reverse Gear Control Group--R.H.--Type 3
| 1L***37 | Reverse Gear Control Group | 1 |
1l7537 Reverse Gear Control Group--R.H.--Type 5
| 1L***37 | Reverse Gear Control Group | 1 |
1l7538 Reverse Gear Control Group--L.H.--Type 3
| 1L***38 | Reverse Gear Control Group | 1 |
1l7538 Reverse Gear Control Group--L.H.--Type 2
| 1L***38 | Reverse Gear Control Group | 1 |
2l5142 Reverse Gear Pneumatic Control Arrangement
| 1A***29 | Bolt (1-1/8") Tube Assembly To Transfer Drive Case | 4 |
| 1L***07 | Governor Pneumatic Actuator Group | 1 |
| 2H***49 | Controlair | 1 |
4l723 Selector Valve Assembly
| 4L***23 | Selector Valve Assembly | 1 |
3l3331 Selector Valve Assembly
| 3L***31 | Selector Valve Assembly | 1 |
2l1677 Single Lever Air Control Group--Type 2
| 2L***77 | Single Lever Air Control Group | 1 |
2l1677 Single Lever Air Control Group--Type 1
| 2L***77 | Single Lever Air Control Group | 1 |
3l3894 Single Lever Governor And Reverse Gear Control Arrangement
| 3L***87 | Control Group--Remotely Mounted | 1 |
| 3L***93 | Control Unit | 1 |
| 3L***94 | Single Lever Governor And Reverse Gear Control Arrangement | 1 |
4l1560 Tool Group
| 4L***60 | Tool Group | 1 |
6h9899 Tool Group
| 6H***99 | Tool Group | 1 |
8h3073 Tool Group
| 8H***73 | Tool Group | 1 |
8f268 Valve
1l6120 Valve Assembly
1h2903 Valve
3h984 Valve Assembly
| 3H***84 | Valve Assembly | 1 |
2l6249 Valve Assembly
| 2L***49 | Valve Assembly | 1 |
3h8599 Valve Assembly
| 3H***99 | Valve Assembly | 1 |
D375D serial number reference
On this vintage Cat marine diesel the ID tag sits on the engine itself, not on a chassis-style PIN plate: check the valve cover or timing cover for a data plate listing the engine serial number (ESN) and arrangement number, and note the ESN is also hand-stamped into the forward, port-side face of the block. Read the first three characters as the prefix (letter-number-letter, e.g. 44B) and the digits after it as the sequential build number; because this engine predates Caterpillar's modern 17-character PIN format, match the 3-character prefix against a period serial-prefix reference rather than a modern PIN decoder.
| Prefix | Identifies | Notes |
|---|---|---|
| 44B | D375D marine diesel engine (supercharged V8, part of the vintage D364/D375 family) | Cataloged as 44B for the D375D marine engine in period serial-prefix references, distinct from generic D375 listings. |
Frequently asked questions
What engine powers the Caterpillar D375D?
The D375D is itself the engine, not a machine it's installed in. It's a Roots-supercharged V8 marine diesel of 27.2 L (1662 cu in) displacement with a 146 x 203 mm (5.75 x 8.00 in) bore and stroke, rated up to 250 kW (335 hp) maximum at 1200 rpm, with continuous output estimated near 205 kW (275 hp). It's the boosted sibling of the naturally aspirated D364, built from the same basic block.
What is the D375D's operating weight?
The D375D is a marine propulsion engine, not mobile equipment, so it has no operating weight figure in the sense used for excavators or dozers. A dry engine weight is not documented in available factory literature for this model. Confirm the figure for your specific unit against its serial number with a Cat dealer or a qualified marine diesel mechanic.
What replaced the Caterpillar D375D?
No confirmed successor model is tied specifically to the D375D. It belongs to Caterpillar's 1949-era D3xx marine and industrial engine family, alongside D337F, D342, D346, D348, D353, D379, and others, and the wider marine diesel line moved on to later Caterpillar offerings in subsequent decades, but no source ties a direct one-for-one replacement to this exact model.
What D375D owners discuss
What actually separates the D375D from its D364 sibling, and does that matter for someone working on one today?
Same basic V8 block as the naturally aspirated D364 - identical 27.2 L (1,662 cu in) displacement and bore/stroke - but the D375D bolts on a Roots-type blower for roughly 70 extra horsepower off the same iron: about 250 kW (335 hp) maximum versus roughly 198 kW (265 hp) on the NA version, with a continuous rating nearer 205 kW (275 hp) around 1,200 rpm. Anyone sourcing parts or manuals for one should expect D364 architecture underneath, with the blower housing and its own induction plumbing added on top.
Why does this engine have two air cleaners instead of one?
The blower pulls more air through the engine than the naturally aspirated version needs, so Caterpillar specified twin oil-bath air cleaners rather than the single canister used on the NA sibling. Treat both as one system when servicing - matching element condition and oil fill in both - and don't assume a single-filter NA-style air intake is correct for this engine; a missing second canister is a sign of a mismatched or incomplete rebuild.
How common is the Roots blower on Cat engines of this era, and should that affect how I plan a rebuild?
General consensus among people who work on this generation of Caterpillar diesel is that Roots-type blowers were only fitted for a fairly narrow window, roughly the early-to-mid 1950s, before Caterpillar moved to turbocharging on the engines that followed. That makes blower-specific hardware - drive gears, seals, housings - a much smaller parts pool than the turbo generation that came after. Plan on longer lead times and specialty vintage-diesel suppliers rather than a standard counter parts lookup.
I've read these were run in twin, counter-rotating pairs. Does that matter if I only have one engine?
Twin counter-rotating installations of this engine were used specifically to cancel out prop-walk/torque reaction when two engines were mounted side by side, most notably in government and military service. On a single-engine installation, correct rotation still has to match the propeller, but the counter-rotating pairing itself is only a consideration for twin-engine vessels, not something to chase on a lone engine.
What should get extra attention on the fuel system given the precombustion-chamber design?
Like other Caterpillar engines of this generation, this engine uses precombustion (indirect injection) chambers ahead of each cylinder, so pulling an injector nozzle means checking both the nozzle seat and the precombustion chamber seat together, not just swapping the nozzle. Reusing a chamber with a worn seat against a fresh nozzle is a recognized source of hard starting and rough running on older indirect-injection Cat diesels. Have a qualified marine diesel mechanic verify chamber and nozzle seat condition and correct torque before returning the engine to service.
What's the biggest long-term wear risk on an engine like this after decades in a boat?
As with any raw-water-cooled engine of this vintage, the recurring issue reported across this generation of Cat marine diesels is corrosion and scaling on the raw-water side of the cooling circuit and wear on the raw water pump (impeller and housing) after long lay-ups or irregular running. This isn't unique to this model - it's inherent to raw-water cooling of that era - and regular running plus raw water pump service are the standard preventive habits owners of engines this old rely on.
What should I check before buying or inheriting a vessel that still has one of these installed?
Start with the basics for any engine this age: confirm identity and rebuild history from the serial number rather than a seller's description, and get real hours since the last major overhaul. Beyond that, specifically inspect the Roots blower drive gear and seals for wear or oil weeping, confirm both oil-bath air cleaner canisters are present and in good shape, check the reduction/reverse gearbox coupling (commonly a Twin Disc unit on engines like this) for play or leaks, and look at raw-water cooling passages for corrosion typical of a long-idle raw-water-cooled engine. Have a qualified marine diesel mechanic run a compression and blower inspection before committing to a purchase.
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
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