Need the exact teardown procedures for your Yanmar marine diesel? This 380-page Yanmar 4jh4-te service manual pdf (OEM #0BJHM-G00200) breaks down every mechanical and electrical system for the 3JH5E, 4JH5E, 4JH4-TE, and 4JH4-HTE engines. Inside, you get full wiring diagrams to trace electrical faults, complete turbocharger washing instructions, and page after page of torque charts. You also unlock detailed fuel system testing protocols, exploded views of the engine body, and a dedicated troubleshooting section built for professional mechanics. Verify fuel supply restriction at exactly 400 mmAq for the 3JH5E, or confirm fuel injector pressure is dialed in between 20.6 and 21.6 MPa before firing it up. A dead engine in the water costs you time and money. Grab this bookmarked file, pull it up on your tablet right in the engine room, and get back to work.
What's Inside This Yanmar 3JH5E, 4JH5E, 4JH4-TE, 4JH4-HTE Manual
| System | Pages | Key Topics |
|---|---|---|
| Introduction | 5-6 | Revision History |
| Safety | 7-16 | Safety Statements, Location of Safety Labels |
| General Service Information | 17-92 | Engine Outline Drawings, Piping Diagrams, Exhaust Gas Emission Regulations, Location of Nameplates, Diesel Fuel, Engine Oil, Engine Coolant |
| Periodic Maintenance | 93-100 | Epa Requirements, Periodic Maintenance Schedule, Periodic Maintenance Procedures |
| Engine | 101-202 | Special Torque Chart, Standard Torque Chart (w/o Lubricating Oil), Sealants and Compounds, Measuring Instruments, Special Service Tools, Specifications |
| Fuel System | 203-258 | Fuel System Components, Fuel System Diagram, Fuel System Tests, Servicing the Fuel System, Special Service Tools, Specifications |
| Cooling System | 259-284 | Cooling Flow Diagram, Draining / Refilling Seawater Cooling System, Measuring Instruments, Tests and Adjustments, Special Service Tools, Specifications |
| Lubrication | 285-296 | Repair, Tests and Adjustments, Special Service Tools, Specifications |
| Turbocharger | 297-308 | Turbocharger Components, Washing the Turbocharger Blower, Cleaning the Air Cleaner, Special Service Tools, Specifications |
| Starter Motor | 309-314 | Starter Motor Specifications, Starter Motor Troubleshooting, Starter Motor Service |
| Alternator | 315-324 | Alternator Service, Specifications |
| Electrical | 325-350 | Component Locations, Wiring Diagram, Instrument Panel, Function Description - Warning Devices |
| Troubleshooting | 351-362 | Troubleshooting Chart, Measuring Compression Pressure, After Troubleshooting or Repair |
| Service Standards | 363-380 | Engine Tuning, Engine Body, Lubricating Oil System (Trochoid Pump), Main Bolt and Nut, Standard Bolts and Nuts (w/o Lubricating Oil) |
Every system also includes safety precautions.
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| 3JH5E, 4JH5E | ||
| Fuel Supply Restriction | 400 mmAq (16 in.Aq) | p. 206 |
| Fuel Injector Pressure | 20.5-21.6 MPa (2986-3132 psi) | p. 223 |
| Connecting Rod Bolt Torque | 44.1 ± 5.0 N-m | p. 106 |
| Oil Pressure (Idle) | 0.05 MPa or more | p. 290 |
| 4JH4-TE | ||
| Fuel Supply Restriction | 1000 mmAq (40 in.Aq) | p. 206 |
| 4JH4-HTE | ||
| Fuel Supply Restriction Excluding Fuel Filter Loss Pressure | 1000 mmAq (40 in.Aq) | p. 206 |
| All Models | ||
| Injection Pressure Change per Shim Thickness | 1.9 MPa (275 psi) per 0.1 mm (0.004 in.) shim thickness | p. 255 |
| Cylinder Head Bolt Torque | 88.2 ± 3.0 N-m | p. 106 |
| 4JH4-TE, 4JH4-HTE | ||
| Turbine Shaft End Nut Torque | 20±2 N·cm (196±19 lb-in) | p. 300 |
Yanmar 3JH5E, 4JH5E, 4JH4-TE, 4JH4-HTE Common Problems This Manual Covers
Yanmar 4JH4-HTE cranks fast but will not fire after a filter change or bad fuel episode. p. 206
Bleed the fuel system completely to remove trapped air. Inspect primary separators and verify fuel supply restriction does not exceed 1000 mmAq (40 in.Aq) as specified on page 206. Drain any contaminated diesel from the tank and prime the lines before attempting another start.
Manual Section: Fuel SystemEngine knocks heavily, idles rough, and produces low power output with visible exhaust color changes. p. 106
Inspect for blown gaskets or worn rings. Remove the cylinder head to check for internal damage. During reassembly, coat the threads with lubricating oil and torque the cylinder head bolts to 88.2 ± 3.0 N-m as specified on page 106. Verify valve clearances before test running.
Manual Section: EngineLoss of power and excessive black smoke from the exhaust under load at rated RPM. p. 255
Test the fuel injectors for proper atomization. If adjusting the pop pressure, remember that adding a 0.1 mm (0.004 in.) shim increases injection pressure by 1.9 MPa (275 psi) according to page 255. Clean the air cleaner and inspect the exhaust system for restrictions.
Manual Section: Fuel SystemInstrument panel shows high temperature and engine overheats when pushed hard under normal propeller loading. p. 262
Pressure test the cooling system to 1.4 bar as detailed on page 262 to locate leaks. Remove and inspect the raw water pump impeller for missing vanes. Verify the thermostat opens fully at 76.5°C, checking page 265 for procedure, and clear any heat exchanger blockages.
Manual Section: Cooling SystemFrequently Asked Questions
What are the torque specifications for Yanmar 4JH4-TE cylinder head bolts?
For Yanmar 4JH4-TE cylinder head bolts, the tightening torque is applied in two steps. The first step requires 44-54 N·m (32-40 lb-ft), and the second step requires 85.2-91.2 N·m (62.9-67.3 lb-ft).
What is the recommended replacement interval for fuel filter elements?
The fuel filter element should be replaced every 250 hours of operation or once a year, whichever comes first, as part of the periodic maintenance schedule.
What is the lubricating oil capacity for the Yanmar 3JH5E engine?
The total lubricating oil capacity for the Yanmar 3JH5E engine is 5.0 ± 0.3 liters (5.3 ± 0.3 quarts). This specification is crucial for proper engine maintenance.
What is the fresh coolant capacity for Yanmar 4JH4-TE and 4JH4-HTE engines, including the recovery tank?
For Yanmar 4JH4-TE and 4JH4-HTE engines, the fresh coolant capacity is 7.2 liters (7.6 quarts) for the engine itself, with an additional 0.8 liters (0.8 quarts) for the coolant recovery tank.
How will I receive this Service Manual?
Instant PDF download. You get the full 380-page searchable Service Manual immediately after payment. Open it on your laptop, tablet, or phone right in the shop.
Can I print this manual?
No restrictions at all. Print individual pages, full chapters, or the entire manual. The PDF is completely unlocked.
Are electrical wiring diagrams included in this Yanmar 3JH5E, 4JH5E, 4JH4-TE?
Complete wiring diagrams are included, covering all electrical circuits, harness routing, and connector pinouts for the Yanmar 3JH5E, 4JH5E, 4JH4-TE, 4JH4-HTE.
Document Quality
This is a native digital PDF, ensuring all text is fully searchable and copyable. The text throughout the manual is crisp and clear, making it easy to read. Most diagrams and illustrations are vector-based, appearing sharp at any zoom level with all labels clearly readable; some illustrations are high-quality raster images. The pages are clean, with no scan artifacts, stains, or skewed content. Please note that several pages are intentionally left blank.
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