Part of the Yanmar Parts Manuals.
Need exact OEM part numbers for your Yanmar 4JH4AE marine diesel? This 56-page parts catalog (OEM #0CR10-M68301EN) covers every assembly in the 4JH4AE, from cylinder block to instrument panel. Inside: exploded-view diagrams for the complete engine, including camshaft and driving gear, crankshaft and flywheel, piston and connecting rod assemblies, dual cooling circuits (sea water and fresh water), fuel injection pump, governor, injection valves, wire harness, bilge pump, starting motor, and generator. Every diagram pairs with a numbered component list so you can cross-reference any part callout to its factory OEM number without guessing. The cylinder block section specifies 10 metal cap bolts and 8 plug-30 pieces per engine, exactly the per-component detail that stops a wrong-part order. No more dead-end searches on parts lookup sites. Bookmarked by system and keyword-searchable; open it on your phone at the parts counter and get the right number on the first call.
What's Inside This Yanmar 4JH4AE (Marine) Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Clutch & Transmission | Clutch | |
| Fuel System | Fuel Injection Pump, Governor, Fuel Feed Pump, Fuel Injection Valve, Fuel Injection Pipe, Fuel Pipe & Fuel Strainer, Fuel Tank | |
| Cooling System | Cooling Sea Water Pump, Cooling Fresh Water Pump, Cooling Fresh Water Cooler, Cooling Sea Water Pipe, Cooling Fresh Water Pipe, Cooling Sea Water Strainer | |
| Engine | Cylinder Block, Flywheel Housing, Cylinder Head, Camshaft & Driving Gear, Crankshaft & Flywheel, Piston & Connecting Rod, Gasket Set | |
| Electrical System | Generator, V-Belt Cover & Generator Attachiment, Wire Harness & Sensor | |
| Hydraulics & 3-Point Hitch | Bilge Pump | |
| Body & Operator Station | Bonnet, Cable Support, V-Belt Cover, Instrument Panel | |
| Decals & Accessories | Tools | |
| Other Components | Gear Housing, Mounting Foot, Lub. Oil Sump, Suction Manifold, Mixing Elbow, Lub. Oil System, Lub. Oil Pipe, Oil/Water Separater, Coupling, Starting Motor |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Standard Finish Color (Packed in a can) | 4L | p. 2 |
| Standard Finish Color (Spray) | 1 piece | p. 2 |
| Cylinder Block Plug, PT1/4 quantity | 2 | p. 4 |
| Cylinder Block Plug, 30 quantity | 8 | p. 4 |
| Cylinder Head Valve Spring quantity | 8 | p. 10 |
Yanmar 4JH4AE (Marine) Common Problems This Manual Covers
Fuel feed pump assembly parts needed, engine losing prime after sitting
Check the Fuel Feed Pump parts list on page 31. The pump assembly, bracket, fuel pipe, and clamp components are listed separately. Also review page 34 for the Fuel Pipe and Fuel Strainer exploded view, where the inline filter and strainer components are itemized. Order the pump assembly and strainer together if the unit has high hours.
Manual Section: Fuel Feed Pump p. 31Oil filter and lubrication system components needed after low oil pressure warning
Turn to the Lub. Oil System parts diagram on page 17. The oil filter assembly, oil cooler assembly, and inlet pipe assembly are each listed with part numbers. Cross-reference the oil sump parts on page 8, which shows the drain plug, gasket, and dipstick guide assembly, to identify any sump-side components that also need replacement. The sump uses 24 bolts (M8x45) on the sealing flange.
Manual Section: Lub. Oil System p. 17Full gasket set needed for top-end overhaul, identifying correct head gasket part number
Open the Gasket Set list on page 51. The complete set includes the head gasket, oil sump gasket, water pump gasket, thermostat gasket, manifold gasket, bonnet gasket, and all associated O-rings and seals, each listed individually. Cross-check the cylinder head parts on page 10 to identify valve stem seals, which are listed separately from the gasket set and must be ordered independently.
Manual Section: Gasket Set(Optional) p. 51Engine mount shock absorbers need replacement, identifying correct mounting foot hardware
Refer to the Mounting Foot parts list on page 7. The shock absorber, mounting bolts (M10x22, 8 per engine), washers, and nuts are all itemized separately. Record the shock absorber part number from the exploded view and note the quantity before ordering, as all four mounts are typically replaced together to restore balanced engine alignment.
Manual Section: Mounting Foot p. 7Frequently Asked Questions
What are the replacement specifications for raw-water impeller?
The raw-water impeller for the YANMAR 4JH4AE is identified by Part No. 129670-42531. This part is listed under the "COOLING SEA WATER PUMP" section. The manual does not provide further replacement specifications such as dimensions, material, or recommended service intervals. p. 19
What are the replacement specifications for heat exchanger?
The heat exchanger core for the YANMAR 4JH4AE is identified as "CORE ASSY, COOLER" with Part No. 129670-44460. This part is listed under the "COOLING FRESH WATER COOLER" section. The manual does not provide further replacement specifications such as dimensions, material, or recommended service intervals. p. 21
How do you fix yanmar 4JH4AE raw-water impeller replacement, need correct part number for sea water pump?
Open the Cooling Sea Water Pump parts list on page 19. Locate the impeller in the exploded view and record the part number listed. Verify the part number against your engine serial number range noted on page 2 before ordering. The sea water pump assembly includes the impeller, housing, and cover plate components, all individually listed with quantities. p. 19
How do you fix exhaust mixing elbow part number needed, corroded unit requires replacement?
Find the Mixing Elbow exploded view on page 13. The elbow assembly, gasket, and associated pipe and joint components are each listed with individual part numbers. Cross-reference the gasket part number against the Gasket Set listing on page 51, where the manifold and bonnet gaskets are also itemized, to confirm you order the correct sealing set alongside the elbow. p. 13
What format is this manual in?
A 56-page Parts Manual in searchable PDF format, available the moment you complete checkout. View on computer, tablet, or phone, with no shipping wait.
Can I print specific sections of this Yanmar 4JH4AE Parts Manual?
Yes, print as many copies as you want, and there are no restrictions. Many mechanics print the section they need and bring it to the shop floor.
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