Part of the Yanmar Repair Manuals.
Yanmar publication 0BJH4-G00101 is the book the dealer technicians worked from, and it reads that way: when a 4JH4-TE loses boost or a 3JH4E cranks without firing, the troubleshooting charts walk the fault back through fuel, air, and compression before you spend money on parts. This PDF service manual covers the 3JH4E, 4JH4E, 4JH4-TE, and 4JH4-HTE marine diesel engines built from 1999 to 2010, 346 pages in English.
Inside are the periodic maintenance schedules, full disassembly and reassembly procedures, injection pump and governor service for both the natural and turbocharged variants, seawater and fresh water cooling systems, the electrical system, and marine gear specifications.
Buy it once and it is yours: keep the file, print the pages you need at the stand, and have the cylinder head torque sequence and bearing inspection procedures in front of you before the engine goes back together.
What's Inside This Yanmar 3JH4E, 4JH4E, 4JH4-TE, 4JH4-HTE Manual
| System | Pages | Key Topics |
|---|---|---|
| History of Revision | 3 | Manual Name, Engine Model, Date of Revision, Reason for Correction, Correction, Corrected by |
| For Safety | 12-17 | Safety Labels, Safety Precautions, Work-Wear (Garments), Tools, Fastener Torque, Electrical |
| General | 18-68 | Exterior Views, Specifications, Fuel Oil, Lubricating Oil and Coolant, Engine Outline, Piping Diagrams |
| Inspection and Adjustment | 69-116 | Periodic Maintenance Schedule |
| Troubleshooting | 117-138 | Preparation Before Troubleshooting, Quick Reference Chart for Troubleshooting, Troubleshooting (Concerning Engine and Fuel Injection Equipment) |
| Disassembly and Reassembly | 139-191 | Disassembly and Reassembly Precautions, Disassembly and Reassembly Tools |
| Inspection and Servicing of Basic Engine Parts | 192-231 | Cylinder Block, Cylinder Head, Piston and Piston Pins, Connecting Rod, Crankshaft and Main Bearing, Camshaft and Tappets, Timing Gear |
| Fuel Injection Equipment | 232-258 | Fuel Injection Pump/Governor for 3JH4E and 4JH4E, Fuel Feed Pump, Fuel Injection Pump/ Governor for 4JH4-TE and 4JH4-HTE, Fuel Injection Nozzle, Fuel Filter |
| Intake and Exhaust System | 259-268 | Intake System, Exhaust System, Turbocharger |
| Lubrication System | 269-277 | Lube Oil Pump, Lube Oil Filter, Lube Oil Cooler, Piston Cooling Oil Nozzle, Rotary Waste Oil Pump (Optional) |
| Coolant System | 278-302 | Seawater Pump, Fresh Water Pump, Heat Exchanger, Pressure Cap and Coolant Recovery Tank, Thermostat |
| Reduction and Reversing Gear | 303-306 | Specifications of 3JH4E Marine Gears, Specifications of 4JH4E and Marine Gears, Specifications of 4JH4-TE and 4JH4-HTE Marine Gears |
| Remote Control System (Optional) | 307-313 | Remote Control System, Remote Control Installation, Remote Control Inspection, Remote Control Adjustment |
| Electrical System | 314-333 | Battery, Starting Motor, Alternator 12V/60A (Optional), Alternator 12V/80A (Standard), Instrument Panel, Warning Devices |
| Service Standards | 334-343 | Engine Tuning, Engine Body, Lubricating Oil System (Trochoid Pump) |
| Tightening Torque for Bolts and Nuts | 344 | Main Bolt and Nut, Standard Bolts and Nuts (Without Lube Oil) |
| Colophon | 345 | First Edition, 3rd Edition, Published by, Copyright |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Impeller durability | Min. 1500 h | p. 281 |
| Thermostat valve opening temperature | 75.0-78.0 deg C | p. 113 |
| Thermostat replacement interval | Every year or 2000 hours of operation | p. 113 |
| Seawater pump impeller durability | Min. 1500 h | p. 281 |
| Seawater pump mechanical seal durability | 3000 h | p. 281 |
Yanmar 3JH4E, 4JH4E, 4JH4-TE, 4JH4-HTE Common Problems This Manual Covers
Cranks but will not start
Air drawn into the fuel system, a clogged filter, or a weak feed pump will leave any JH4 spinning without firing. The quick reference chart traces the symptom through fuel supply, injection equipment, and compression in order, so you stop guessing before you start replacing parts.
Manual Section: 3. Troubleshooting p. 117Overheating and coolant alarms
A worn seawater impeller or fouled heat exchanger is the usual cause of temperature alarms on these engines. The manual covers the seawater pump, fresh water pump, heat exchanger, and thermostat, and lists an impeller service life of at least 1,500 hours with seals rated for 3,000.
Manual Section: 9. Coolant System p. 278Boost loss and black smoke
On the turbocharged 4JH4-TE and 4JH4-HTE, black smoke under load usually points to a restricted air path, leaking intake connections, or turbocharger wear. This section covers the intake system, exhaust system, and turbocharger itself.
Manual Section: 7. Intake and Exhaust System p. 259Low oil pressure warning
A low pressure alarm can mean anything from a clogged filter to a worn lube oil pump, and running on while you guess risks the bearings. This chapter covers the lube oil pump, filter, oil cooler, and the piston cooling oil nozzles.
Manual Section: 8. Lubrication System p. 269White smoke and low compression
Persistent white smoke and rough running after warm-up often come down to worn rings, valves, or cylinder wear. This section walks through measuring and servicing the cylinder block, cylinder head, pistons, connecting rods, crankshaft and main bearings, camshaft, and timing gear.
Manual Section: 5. Inspection and Servicing of Basic Engine Parts p. 192Hunting idle or dribbling injectors
Surging at idle and poor combustion trace back to the injection pump, governor, or worn nozzles. The manual gives separate pump and governor procedures for the 3JH4E and 4JH4E versus the turbo engines, plus nozzle and fuel filter service.
Manual Section: 6. Fuel Injection Equipment p. 232Slow cranking and charging faults
Marine electrics corrode, and a lazy starter or dead battery is often a system fault rather than one bad part. This chapter covers the battery, starting motor, both alternator options, the instrument panel, and the warning devices behind the alarms.
Manual Section: 12. Electrical System p. 314Frequently Asked Questions
Which engines does this manual cover?
The Yanmar 3JH4E and 4JH4E, plus the turbocharged 4JH4-TE and 4JH4-HTE, model years 1999 to 2010. The General section gives exterior views, specifications, and piping diagrams for each variant, and later chapters give separate injection pump and governor procedures for the natural and turbo engines. p. 18
Does it include torque values for reassembly?
Yes. Section 14, Tightening Torque for Bolts and Nuts, lists main and standard fastener torques, and the Service Standards chapter covers engine tuning and engine body limits. The reassembly procedures cover the cylinder head torque sequence and bearing work in step order. p. 344
Does it cover seawater pump and impeller service?
Yes, the Coolant System section covers the seawater pump, fresh water pump, heat exchanger, pressure cap, and thermostat. It lists impeller service life at a minimum of 1,500 hours, seals at 3,000 hours, and thermostat replacement every year or 2,000 hours, whichever comes first. p. 278
Is the marine gear included?
Section 10, Reduction and Reversing Gear, gives the specifications for the marine gears fitted to the 3JH4E, 4JH4E, 4JH4-TE, and 4JH4-HTE. A separate chapter covers the optional remote control system, including installation, inspection, and adjustment. p. 303
How quickly can I access this manual?
Instant PDF download. You get the full 346-page searchable Service Manual immediately after payment. Open it on your laptop, tablet, or phone right in the shop.
Is printing allowed for this Yanmar 3JH4E Service 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.
Does this Yanmar 3JH4E manual have electrical schematics?
Yes, full electrical schematics are included with wire colors, connector locations, and circuit descriptions.
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