Part of the Yanmar Operator Manuals.
A raw water impeller that has run two seasons too long announces itself as a slowly climbing temperature gauge, usually a long way from the dock. This operator manual for the Yanmar JH4 series marine diesels, covering the 3JH4E, 4JH4AE, 4JH4-TE, and 4JH4-HTE, is the book Yanmar issued with these engines: publication 0AJH4-G00102, 142 pages, built for 2006-2007 production, delivered as a PDF download.
It covers daily checks, diesel fuel and engine oil specifications, bleeding the fuel system, cold weather starting, and the periodic maintenance schedule, including the 1000 hour seawater pump impeller replacement. Guessing at a fuel filter torque or an oil grade is how threads strip and injection systems suffer; the figures in this book are the ones Yanmar published.
Specifications for each engine with its marine gear or sail drive, piping and wiring diagrams, troubleshooting charts, and long-term storage procedures complete it, and the engine runs again because you followed the page, not a guess.
Complete the set for your 3JH4E, 4JH4AE, 4JH4-TE…
Other edition of this manual
What's Inside This Operator Manual
| System | Pages | Key Topics |
|---|---|---|
| Introduction | 7-8 | Record of Ownership |
| Safety | 9-18 | Safety Precautions (Before You Operate, During Operation and Maintenance), Location of Safety Decals |
| Product Overview | 19-32 | Yanmar JH4 Features and Applications, New Engine Break-In |
| Before You Operate | 33-48 | Diesel Fuel (Specifications), Filling the Fuel Tank, Bleeding the Fuel System, Engine Oil (Specifications, Viscosity, Checking the Engine Oil, Adding Engine Oil) |
| Engine Operation | 49-56 | Starting the Engine (Restarting After Starting Failure, Starting at Low Temperatures, After the Engine Has Started) |
| Periodic Maintenance | 57-82 | Safety Precautions |
| Troubleshooting | 83-88 | Troubleshooting After Starting, Troubleshooting Chart, Troubleshooting Information |
| Long-Term Storage | 89-92 | Prepare Engine for Long-Term Storage, Drain Seawater Cooling System |
| Specifications | 93-106 | Principal Engine Specifications (3JH4E Engine Specifications, 3JH4E Marine Gear Specifications, 4JH4AE Engine Specifications, 4JH4AE Marine Gear or Sail Drive Specifications, 4JH4-Te Engine Specifications, 4JH4-Hte Engine Specifications) |
| System Diagrams | 107-134 | Piping Diagrams, Wiring Diagrams |
| EPA Warranty Usa Only | 135-138 | Yanmar Co. |
| Emission System Warranty | 139-142 | Non-Road Emission System Warranty (Yanmar Co., Ltd. Limited Emission Control System Warranty - Usa Only) |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Seawater pump impeller replacement interval | every 1000 hours | p. 64 |
| Alternator V-belt deflection | 8 - 10 mm (approximately 3/8 in.) | p. 68 |
| Maximum allowable coolant temperature | 95˚C (203˚F) or higher | p. 30 |
| Engine Oil SAE Viscosity | 10W30, 15W40 | p. 38 |
| 3JH4E, 4JH4AE | ||
| Fuel filter tightening torque (3JH4E / 4JH4AE) | 20 - 24 N·m (14.75 - 17.7 ft-lb) | p. 74 |
| 4JH4-TE, 4JH4-HTE | ||
| Fuel filter tightening torque (4JH4-TE / 4JH4-HTE) | 11.8 - 15.6 N·m (104.4 - 138.1 in.-lb) | p. 74 |
| 3JH4E | ||
| Effective oil capacity (3JH4E KM35P) | 1.1 L (1.2 qt) | p. 94 |
| Effective oil capacity (3JH4E KM35A, SD40/SD50) | 1.2 L (1.3 qt) | p. 94 |
| 3JH4E, 4JH4-TE, 4JH4-HTE | ||
| Engine Oil API Service Category (3JH4E, 4JH4-TE, 4JH4-HTE) | CD or higher | p. 38 |
| 4JH4AE | ||
| Engine Oil API Service Category, 4JH4AE | CH-4 only | p. 38 |
