Looking for the factory tear-down procedures for your 1999-2010 Yanmar Marine Diesel Engine? This 346-page Yanmar 4JH4-TE service manual PDF breaks down every system for the 3JH4E, 4JH4E, and 4JH4-HTE variants. Open the file to find complete electrical wiring diagrams, a detailed troubleshooting matrix for fuel injection faults, and step-by-step rebuild procedures for the cylinder block. You get exact inspection criteria for everything from the cooling loops to the turbocharger. Verify the thermostat valve opening temperature hits 75.0-78.0 deg C, and torque the new fuel filter to 11.8-15.6 Nm before bleeding the lines. A dead engine in the water ruins the whole weekend. Grab this bookmarked file, pull it up on your tablet in the engine room, and get your boat running right.
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, Outline of 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 | Code No., First Edition, 3rd Edition, Published by, Edited 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
Yanmar 3JH4E engine temperature climbs steadily under heavy load and triggers the high coolant temperature alarm. p. 281
Inspect the seawater pump impeller on page 281. Replace the impeller if it has exceeded its minimum 1500 h durability limit. Verify the thermostat opens fully at 75.0-78.0 deg C as specified on page 113. Check the V-belt for 8-10 mm deflection.
Manual Section: 9. Coolant SystemEngine cranks normally but will not start or fires briefly and stalls shortly after sitting. p. 74
Drain and clean the fuel lines. Replace the fuel filter every 250 hours or one year as outlined on page 74. Torque the new filter to 11.8-15.6 Nm. Bleed all air from the system before attempting to restart the engine.
Manual Section: 2. Inspection and AdjustmentSudden loss of power under heavy load accompanied by thick black smoke and changing turbo whistle. p. 233
Check the intake hoses for leaks. Verify the fuel injection pressure reaches exactly 13.0 MPa for turbocharged models as noted on page 233. Inspect the air filter and clean the intercooler core if intake pressure drops below minimum operating specifications.
Manual Section: 6. Fuel Injection EquipmentLow oil pressure warning buzzer sounds continuously at idle after reaching normal operating temperature. p. 61
Measure the oil level and verify it is not diluted with diesel. Replace the lube oil filter every 50 hours or one month as directed on page 52. Torque the new oil filter to 20-24 Nm using the specification found on page 61.
Manual Section: 1. GeneralFrequently Asked Questions
What is the torque specification for YANMAR 4JH4-TE cylinder head bolts?
For the YANMAR 4JH4-TE, the cylinder head bolts should be tightened in two steps. The first step requires a torque of 39.2-49.1 Nm (4.0-5.0 kgf·m), and the final torque should be 85.2-91.2 Nm (8.69-9.30 kgf·m). This procedure is detailed in the manual for proper assembly.
What are the replacement specifications for fuel filters for the YANMAR 4JH4-TE/4JH4-HTE engines?
For 4JH4-TE/4JH4-HTE engines, the fuel filter part number is 129574-55820. It uses a paper element with a filtration area of 0.24 m² and an accuracy of 15 µ. The maximum flow is 0.8 L/min, and water separation is 120 cm³.
What are the replacement specifications for lube oil filters for the YANMAR 3JH4E/4JH4E engines?
For 3JH4E/4JH4E engines, the applicable lube oil filter part number is 119305-35150. When replacing, moisten the new oil filter gasket with engine oil and tighten it manually until it contacts the mounting surface, then turn it an additional 3/4 of a turn with a filter wrench. The tightening torque is 20-24Nm (177-212 lb-in).
What is the coolant capacity for the YANMAR 3JH4E engine?
The YANMAR 3JH4E engine has a coolant volume of 4.5 liters (4.8 quarts). Additionally, the coolant recovery tank has a capacity of 0.8 liters (0.8 quarts).
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.
Are there any print restrictions on this Yanmar 3JH4E, 4JH4E, 4JH4-TE?
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.
Are electrical wiring diagrams included in this Yanmar 3JH4E, 4JH4E, 4JH4-TE?
Yes, full electrical schematics are included with wire colors, connector locations, and circuit descriptions.
Document Quality
This document is a scanned PDF, not a native digital file. You can search the full text, and the OCR layer is generally accurate, making the text copyable. The text quality is consistently crisp and easy to read throughout the manual. Diagrams and illustrations are primarily raster images, but they are clear, and their labels are readable, even if they show some pixelation when zoomed in. The pages are clean with no noticeable scan artifacts, stains, or skewed content, and there are no notable blank or filler pages.
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