Part of the Yanmar Parts Manuals.
An impeller swap on a 4JH4AE stalls the moment the sea water pump turns out to need more than the impeller you ordered. This parts catalog is Yanmar's own listing for the 4JH4AE diesel, publication 0CR10-M68301EN, 56 pages in English, sold as a direct PDF download, and it puts every factory part number for this engine on your bench before you open a single joint.
Each assembly gets its own section: Cylinder Block, Crankshaft & Flywheel, Piston & Connecting Rod, the Fuel Injection Pump and Governor, both cooling circuits from sea water pump to fresh water cooler, the Mixing Elbow, Clutch, Starting Motor, and the B-Type and C-Type instrument panels. Quantities are listed too, so you know the block carries five main bearings and eighteen head bolts before teardown.
Buy it once and it stays with the engine: print the pages you need, keep the file on the bench laptop, and order by number instead of by guess.
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
Runs hot from a tired impeller
Overheating under load usually traces back to restricted raw water flow, and the impeller is the first suspect. The Cooling Sea Water Pump section lists the pump's parts by factory number so you can rebuild the pump properly instead of just swapping the impeller and hoping.
Manual Section: Cooling Sea Water Pump p. 19Fouled fresh water cooler
Scale and salt slowly choke the cooler until the temperature climbs on long runs. When cleaning is no longer enough, the Cooling Fresh Water Cooler section gives the factory numbers for the cooler assembly and its hardware.
Manual Section: Cooling Fresh Water Cooler p. 21Loses fuel prime, starts hard
A common complaint on this engine: it wants extra throttle to start after sitting, then dies as air works into the fuel. The Fuel Feed Pump section identifies the lift pump parts, and the Fuel Pipe & Fuel Strainer section covers the lines and strainer where leaks usually begin.
Manual Section: Fuel Feed Pump p. 29Mixing elbow corrosion
The elbow rots from the inside, and a blocked or perforated one can let water work back toward the cylinders. The Mixing Elbow section identifies the elbow and its fittings so a replacement is on the shelf before it fails.
Manual Section: Mixing Elbow p. 13White smoke and power loss
Worn or dirty injectors show up as white smoke, rough running, and lost power. The Fuel Injection Valve section lists the injector assemblies by part number for replacement or exchange during a fuel system refresh.
Manual Section: Fuel Injection Valve p. 30Low oil pressure
Contaminated oil or a starved circuit takes out bearings fast. The Lub. Oil System and Lub. Oil Pipe sections break the lubrication circuit down part by part, so an oil pressure chase ends with the right components on order.
Manual Section: Lub. Oil System p. 17Worn main bearings at rebuild time
A rumbling bottom end means measuring the crank and ordering bearings. The Cylinder Block section lists the five main bearings along with the head bolts and plugs you will disturb on the way in.
Manual Section: Cylinder Block p. 4Frequently Asked Questions
Which engine does this parts catalog cover?
The Yanmar 4JH4AE diesel engine. It is the factory parts catalog, Yanmar publication 0CR10-M68301EN, 56 pages in English, organized section by section from the Cylinder Block through the instrument panels.
Is this a service manual with torque specs and clearances?
No. This is the parts catalog: factory part numbers and quantities for every assembly, such as the eight valve springs listed in the Cylinder Head section. Use it alongside a service manual; this book is what tells you exactly which parts, and how many, to order before reassembly. p. 10
Does it cover the cooling system?
Yes, in detail. Separate sections cover the Cooling Sea Water Pump, Cooling Fresh Water Pump, Cooling Fresh Water Cooler, both sets of cooling pipes, and the Cooling Sea Water Strainer, so the entire sea water and fresh water side of the engine can be ordered by factory number. p. 19
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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