Part of the Yanmar Parts Manuals.
With the crankshaft out and the journals measured, the next job is ordering the right shells, and the Cylinder Block section of this catalog lists standard, 0.25 under-sized, and over-sized metal for the mains and crankpins, so the correct bearings arrive the first time.
The catalog is Yanmar publication Y00R3512, covering the 4JH2E, 4JH2-TE, 4JH2-THE, 4JH2-DTE, 4JH2-UTE(B), and 4JH2-HTE marine diesels across 110 pages. It walks the engine end to end: cylinder head, piston and connecting rod, camshaft and driving gear, fuel injection pump and governor, turbocharger, sea and fresh water cooling circuits, gear housing, clutch, and the electrical system, each drawn as an exploded figure with a numbered parts list.
Per-model quantity columns show which parts fit which variant, so you can tell what the naturally aspirated 4JH2E shares with the turbocharged engines before you spend anything. It downloads as a bookmarked PDF you can keep at the bench or print by the page.
What's Inside This Yanmar 4JH2 Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Clutch & Transmission | Clutch Remote Control, Clutch Assy, Clutch Housing, Clutch Shaft, Counter Shaft, Input Shaft & Counter Shaft | |
| Fuel System | Fuel Injection Pump, Fuel Injection Pipe, Fuel Pipe, Governor, Engine Stop & Cold Start Device, Fuel Tank, Engine Stop Device | |
| Cooling System | Air Cooler, Lubrication Oil Cooler, Cooling Sea Water Pump, Cooling Fresh Water Pump, Cooling Fresh Water Cooler, Cooling Sea Water Pipe, Cooling Fresh Water Pipe, Sea Water Filter | |
| Engine | Cylinder Block, Flywheel Housing, Lubrication Oil Sump, Cylinder Head, Bonnet & Breather, Camshaft & Driving Gear, Turbocharger, Crankshaft & Flywheel, Piston & Connecting Rod, Lubrication Oil System, Lubrication Oil Line, Gasket Set | |
| Electrical System | Generator, Wire Harness & Sensor, Electric Bilge Pump | |
| Hydraulics & 3-Point Hitch | Speed Remote Control Device | |
| Body & Operator Station | Instrument Panel | |
| Decals & Accessories | Label, Tool | |
| Other Components | Gear Housing, Mounting Foot, Suction Manifold, Mixing Elbow, Timer, Starting Motor, Spare Part, Coupling, Single Lever Control, Repair Set, Reequip Ment Kit, Input Shaft, Output Shaft, Control Device |
Every system also includes a parts list.
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Impeller quantity | 1 unit | p. 51 |
| Fuel Strainer Assembly quantity | 1 unit | p. 51 |
| Thermostat quantity | 1 unit | p. 51 |
| Sea Water Pump Seal Dimension | 20x35x8mm | p. 24 |
| Cooling Sea Water Hose (ID/OD x Length) | 13/20x300mm | p. 28 |
| Generator Output | 12V-55A | p. 49 |
| Electric Bilge Pump Voltage | 12V | p. 56 |
| Fuel Tank Capacity | 30L | p. 58 |
| Remote Control Cable Length | 7m | p. 63 |
| Instrument Panel Fuse Rating | 3A | p. 67 |
Yanmar 4JH2 Common Problems This Manual Covers
Corroded mixing elbow lets seawater backflow
The mixing elbow is a known weak point on these engines: corrosion eats through it and lets cooling water run back into the exhaust and cylinders. The Mixing Elbow figure identifies the elbow and its related hardware by part number so you replace the whole path, not just the visibly rotted piece.
Manual Section: Mixing Elbow p. 14Turbo carbon fouling cuts boost
Long stretches of low-load running foul the turbine side with carbon, and owners of the turbocharged variants report lost boost and engines that will not pull rated RPM. The Turbocharger section lists the parts with interchangeability remarks, which matters because superseded turbo components trip up plenty of orders.
Manual Section: Turbocharger p. 15Overheating from a spent impeller
Rubber sea water pump impellers shed vanes without warning, and the shreds end up downstream in the cooling circuit. The Cooling System listings cover the sea water pump with its seal, the fresh water pump, coolers, thermostat, and piping, so you can order the pump internals and check the rest of the circuit from the same figures.
Manual Section: Cooling SystemEngine will not reach rated RPM
A 4JH2 that tops out well below governed speed often traces to restricted fuel delivery. The Fuel System section breaks out the injection pump, injection pipes, governor, fuel strainer (page 51), and stop and cold start devices, so you can identify and replace the starved component instead of guessing.
Manual Section: Fuel System p. 51Compression loss after water ingestion
Seawater that gets past a failed elbow sits on the valves and pits the seats, and the engine cranks soft afterward. The Cylinder Head section lists the head, valve train components, and designated repair parts you will need once the head comes off for reconditioning.
Manual Section: Cylinder Head p. 8Low oil pressure from worn bearings
Falling oil pressure at operating temperature usually means the main and rod bearing clearances have opened up. The Cylinder Block section lists standard shells alongside 0.25 under-sized and over-sized metal, so after the crank is measured or reground you order shells that match the journals.
Manual Section: Cylinder Block p. 2Frequently Asked Questions
Which engine models does this parts catalog cover?
It covers the Yanmar 4JH2E, 4JH2-TE, 4JH2-THE, 4JH2-DTE, 4JH2-UTE(B), and 4JH2-HTE marine diesel engines. The parts lists use per-model quantity columns, so each figure shows which part numbers and quantities apply to your specific variant.
Is this a service manual with torque specs and clearances?
No, this is the factory parts catalog, publication Y00R3512: exploded figures and part numbers for identification and ordering, not procedures. It does not give torque or clearance values, and guessing those numbers is how heads warp and bearings spin. Pair it with a service manual for assembly specs.
Does it list undersized bearings for a reground crankshaft?
Yes. The Cylinder Block section includes the standard parts list plus 0.25 under-sized and over-sized metal options for the main and crankpin bearings, so you can order shells matched to reground journals. p. 2
Are turbocharger parts covered for the turbo models?
Yes. The Turbocharger section carries the exploded figure and parts list for the turbocharged variants, including interchangeability remarks that flag which components substitute for others, useful when a listed number has been superseded. p. 15
How will I receive this Yanmar 4JH2E & variants Parts Catalog?
This is a 110-page searchable PDF ready for immediate download. Works on any device, so pull it up on your phone while you're under the hood. No shipping, no waiting.
Can I print specific sections of this Yanmar 4JH2E & variants Parts Catalog?
No restrictions at all. Print individual pages, full chapters, or the entire manual. The PDF is completely unlocked.
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