Part of the Yanmar Repair Manuals.
Popping an injector on a bench tester and reading 220±5 kgf/cm² is the moment a 4JH3 fuel system stops being a mystery, and the Overhaul chapter of this Yanmar service manual gives you that figure along with the YDLLA-P nozzle specs and the case nut torque to put it back together correctly. The same chapter strips the rest of the engine: cylinder head and valve guides, pistons and rings, crankshaft and main bearings, camshaft, gear train, the lubrication and cooling water systems, and the IHI RHB52W turbocharger.
It covers the 4JH3-TE, 4JH3-HTE and 4JH3-DTE marine diesels under Yanmar publication HINSHI-H10-009, 100 pages in English, delivered as a bookmarked PDF download.
Beyond teardown, you get a troubleshooting chapter keyed to real symptoms, a periodic checking list, and a service specifications section with the adjusting standards, clearances and tightening torques you need before the engine goes back together.
Complete the set for your 4JH3 Series
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| 1. to Perform Service Safely | 6-11 | Warning Symbols, Safety Precautions, Location of Product Safety Labels |
| General Description | 12-25 | Principal Particulars, Appearance and Names of Parts, Cross-Sectional Drawing, Piping Diagram, Performance Curves, Front Power Take-Off, Fuel Oil, Lube Oil |
| Overhaul | 26-75 | Cylinder Head, Combustion Surface, Valve Seat, Suction/Exhaust Valve and Valve Guide, Valve Spring, Valve Arm and Push Rod, Installing the Cylinder Head, Piston |
| Troubleshooting | 76-84 | Does Not Start or Difficult to Start, Unsmooth Revolution, Sudden Engine Stop, Poor Exhaust Gas Color, Insufficient Output, Uneven Cylinder Outputs, Knocking |
| Periodic Checking List | 85 | Fuel Oil Check and Supply, Lube Oil Check and Replacement, Marine Gear Oil Check and Replacement, Cooling Water System Check, Electrical Components Check |
| Tool and Measuring Instrument | 86-88 | Tool, Measuring Instrument |
| Service Specifications | 89-96 | Engine Adjusting Standards, Service Standards |
| Instrument Panel(Option) | 97-100 |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Cylinder head bolt tightening torque (First step) | 5 kgf·m | p. 32 |
| Cylinder head bolt tightening torque (Second step) | 9.3±0.3 kgf·m (91.4±0.94 N·m) | p. 32 |
| Nozzle type | YDLLA-P | p. 63 |
| Hole angle | 150° | p. 63 |
| Fuel filter water alarm activation level | On at the water level of 23 mm (80cm³) or more | p. 89 |
| Turbocharger model | RHB52W (IHI) | p. 72 |
| Turbine shaft end nut tightening torque | 20±2 kgf·cm (196±19 N·cm) | p. 72 |
| Fuel feed pump type | Vane type (built-in) | p. 55 |
| Top clearance | 0.8±0.09 mm | p. 89 |
| Valve clearance | 0.2±0.05 mm | p. 89 |
| 4JH3-TE | ||
| Number of nozzle holes hole diameter, 4JH3-TE | 5-φ0.23 mm | p. 63 |
| 4JH3-HTE,DTE | ||
| Number of nozzle holes hole diameter (4JH3-HTE,DTE) | 5-φ0.25 mm | p. 63 |
