Part of the Yanmar Repair Manuals.
Set the 84 mm bore of a 3JH3 against a bore gauge and the wear limit question answers itself: 84.00 to 84.03 mm standard, and this Yanmar service manual (publication HINSHI-H8009) is where that number lives. It covers the 3JH3(B)(C)E(A), 4JH3(B)(C)E, and 4JH3CE1 marine diesels built from 2000 to 2005, with 3JH3E series coverage from serial prefix A01158 onward.
Across 305 pages it works through the basic engine parts, the fuel injection pump and governor, lubrication, sea water and fresh water cooling, the KM3A and KM3P4 marine gears, the electrical system, and complete disassembly and reassembly backed by a table of standard measurements. Every hour spent guessing at a clearance is an hour the engine stays apart on the stand.
The file is a bookmarked, searchable PDF, so you can keep it on a laptop at the bench, print the greasy-hands pages, and have the torque sequences wherever the engine is.
What's Inside This Yanmar 3JH3(B)(C)E(A), 4JH3(B)(C)E, 4JH3CE1 Manual
| System | Pages | Key Topics |
|---|---|---|
| History of Revision | 4-7 | Fuel Injection Timing Adjustment, Crankshaft V-Pulley Fastening Bolt Tightening Torque, Remote Control Cable Connection, EPA/ARB Certified Tamper Resistance |
| For Safety | 9-14 | 1. for Safe Servicing, Precaution for Safe Servicing |
| General | 15-31 | Exterior Views, Specifications, Engine Outline, Piping Diagrams |
| Inspection and Servicing of Basic Engine Parts | 32-61 | Cylinder Block, Cylinder Head, Piston and Piston Pins, Connecting Rod, Crankshaft and Main Bearing, Camshaft and Tappets, Timing Gear, Flywheel and Housing |
| Fuel Injection Equipment | 62-110 | Fuel Injection Pump Service Data, Governor, Disassembly, Reassembly and Inspection of Fuel Injection Pump, Fuel Injection Pump and Governor, Fuel Feed Pump, Fuel Injection Nozzle |
| Intake and Exhaust System | 111-113 | Intake System, Exhaust System |
| Lubrication System | 114-123 | Lube Oil Pump, Lube Oil Filter, Lube Oil Cooler, Rotary Waste Oil Pump (Optional) |
| Cooling Water System | 124-142 | Sea Water Pump, Fresh Water Pump, Heat Exchaniger, Pressure Cap and Sub Tank, Thermostat, Bilge Pump and Bilge Strainer (Optional) |
| Reduction and Reversing Gear | 143-199 | Marine Gear Models [KM3A], Shifting Device, Inspection and Servicing, Disassembly, Reassembly, Marine Gear Models [KM3P4] |
| Remote Control (Optional) | 200-205 | Remote Control System, Remote Control Installation, Remote Control Inspection, Remote Control Adjustment |
| Electrical System | 206-256 | Battery, Starter Motor, Alternator Standard, 12V/55A, Alternator 12V/80A (Optional), Instrument Panel, Waming Devices |
| Disassembly and Reassembly | 257-298 | Disassembly and Reassembly Precautions, Disassembly and Reassembly Tools, Table of Standard Measurements for Maintenance |
| Troubleshooting | 299-304 | Fuel Oil System, Fuel Injection Pump, Governor, Marine Gear, Cylinder Output, Exhaust Color, Cooling Water System, Lube Oil System |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Fuel injection nozzle opening pressure | 215~225 kg/cm² | p. 94 |
| Bore x stroke | 84 x 90 mm | p. 18 |
| Cylinder bore dia. (Standard) | 84.00~84.03 mm | p. 35 |
| Connecting rod tightening torque | 4.5~5.5 kgf-m | p. 48 |
| 3JH3(B)(C)E(A) | ||
| Number of cylinders, 3JH3(B)(C)E(A) | 3 | p. 1 |
| 4JH3(B)(C)E, 4JH3CE1 | ||
| Number of cylinders (4JH3(B)(C)E, 4JH3CE1) | 4 | p. 1 |
| most models (17.4 for 3JH3(B)(C)E on p18) | ||
| Compression ratio | 17.7 | p. 19 |
| most models (200±5 kgf/cm² for 3JH3(B)(C)E on p18) | ||
| Fuel injection pressure | 21.6±0.5 kgf/cm² | p. 19 |
Yanmar 3JH3(B)(C)E(A), 4JH3(B)(C)E, 4JH3CE1 Common Problems This Manual Covers
Corroded exhaust elbow lets seawater in
A wet exhaust that rots from the inside can feed seawater back toward the valves, showing up as hard starting and weak compression. The exhaust system layout in this chapter is the starting point for tracing that intrusion path.
Manual Section: Chapter 4 Intake and Exhaust System p. 111Low compression and hard starting
Once seawater or plain hours have taken the valve seats and rings, the cure is measurement, not guesswork. This chapter carries the inspection procedures and limits for the cylinder head, pistons, crankshaft, and main bearings.
Manual Section: Chapter 2 Inspection and Servicing of Basic Engine Parts p. 32Overheating after impeller or pump wear
The raw-water impeller is a routine casualty on these engines, and a tired fresh water pump or stuck thermostat finishes the job. Sea water pump, fresh water pump, heat exchanger, and thermostat servicing all live in this chapter.
Manual Section: Chapter 6 Cooling Water System p. 124Black smoke and poor power under load
Black smoke usually traces to fueling: a worn injection pump, lazy governor response, or nozzles that dribble instead of atomizing. This chapter covers pump service data, governor adjustment, and injection nozzle inspection and testing.
Manual Section: Chapter 3 Fuel Injection Equipment p. 62Blue smoke and rising oil consumption
Blue smoke is often an oiling problem rather than a worn-out engine: overfill or a crankcase breather fault can pull oil into the intake. Work through the lube oil pump, filter, and cooler procedures here before condemning the rings.
Manual Section: Chapter 5 Lubrication System p. 114Marine gear slips or shifts hard
A gear that clunks into ahead or slips under load points at the shifting device or clutch wear. This chapter covers construction, shifting device service, and full disassembly and reassembly for the KM3A and KM3P4 gears.
Manual Section: Chapter 7 Reduction and Reversing Gear p. 143Slow cranking and charging faults
A starter that drags or an alternator that whines at the bearing wastes batteries and mornings. Battery, starter motor, both alternator variants, instrument panel, and warning devices are covered in this chapter.
Manual Section: Chapter 9 Electrical System p. 206Frequently Asked Questions
Which Yanmar engines does this service manual cover?
It covers the Yanmar 3JH3(B)(C)E(A), 4JH3(B)(C)E, and 4JH3CE1 marine diesel engines from 2000 to 2005, with the 3JH3E series covered from serial prefix A01158 onward. It is Yanmar publication HINSHI-H8009, in English.
Does it include torque specs and rebuild clearances?
Yes. The Inspection and Servicing of Basic Engine Parts chapter carries the measured limits, including the 84.00 to 84.03 mm standard cylinder bore (page 35) and the connecting rod tightening torque listed at 4.5 to 5.5 kgf-m (page 48). Follow the tightening sequence in the chapter rather than a single figure: this book prints staged tightening for some fasteners — page 42 gives a first pass of 4.5 to 5.5 and a second of 8.7 to 9.3 — and Chapter 10 adds the standard torque table. p. 32
Is the marine gear covered as well as the engine?
Yes. The Reduction and Reversing Gear chapter covers the KM3A and KM3P4 marine gears: construction, the shifting device, inspection and servicing, and step-by-step disassembly and reassembly. p. 143
What injector and injection pump data does it contain?
The Fuel Injection Equipment chapter gives pump service data, governor adjustment, feed pump service, and injection nozzle inspection, including the 215 to 225 kg/cm2 nozzle opening pressure, plus the injection timing adjustment procedure for EPA/ARB certified 3JH3E engines. p. 62
How will I receive this manual?
You get a 305-page searchable PDF that downloads instantly after checkout. Open it on your laptop, tablet, or phone, and bring it right to the shop floor.
Am I free to print this Service Manual?
The PDF is DRM-free. Print whatever sections you need to take out to the shop. Standard letter or A4 paper works.
Can I find wiring schematics in this Yanmar 3JH3(B)(C)E(A) manual?
Yes, full electrical schematics are included with wire colors, connector locations, and circuit descriptions.
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