Yanmar 4JH-DTE, 4JH-HTE, 4JH-TE & 4JH-DTB(E) Marine Diesel Engine Service Manual (P/N 0000A0A1647)
317 Pages • 11.71 MB • Instant, Printable PDF
Yanmar Models Covered & Key Technical Specifications
Models: Yanmar 4JHE, 4JH-TE, 4JH-HTE, 4JH-DTE, 4JH-DTBE
Sub-models / Variants: 4JH Series marine diesel engines, including models with turbochargers and intercoolers
Model Years: 1985 onwards
Serial Numbers: Engines produced at YANMAR plant on and after June 21, 1985; specific engine numbers listed from E/# 00101, E/# 11001, E/# 21001, and E/# 30101
Technical Data:
- Engine configuration: 4-cylinder, 4-cycle, vertical water-cooled diesel
- Combustion system: Direct injection
- Displacement: 1.644 liters (100.33 cu. in.)
- Max continuous output (DIN6270A): 40–70 HP (depending on model variant)
- Compression ratio: 15.9:1 to 17.8:1
- Direction of rotation: Counter-clockwise (crankshaft) and clockwise (propeller shaft) viewed from stern
- Fuel injection system: Bosch type YPES-CL in-line pump
- Injection pressure: 195–205 kg/cm² (2,773–2,915 lb/in.²)
- Electrical system: 12V 1.8kW starter, 12V 55A alternator
- Cooling system: Fresh water (centrifugal pump) and sea water (rubber impeller pump)
Yanmar Manual Features & Content Preview
- Covers the Yanmar 4JHE, 4JH-TE, 4JH-HTE, 4JH-DTE, and 4JH-DTBE marine diesel engines, providing deep technical specifications and component teardowns
- Official OEM publication (Form 0000A0A1647, originally printed July 1985)
- Features 56 exploded-view assembly diagrams and 39 technical data tables to streamline internal engine, fuel, and cooling system evaluations
- This 317-page reference delivers crucial factory clearance values often missing from aftermarket guides
Internal Engine and Fuel System Details
This publication serves as an extensive reference for the construction and layout of the Yanmar 4JH series. It dives deep into the cylinder block design, internal moving parts like the crankshaft and pistons, and the overall cooling system architecture. You get precise documentation on specific fuel injection equipment. This includes the Bosch-type YPES-CL injection pump, automatic advancing timer, and exact fuel feed pump configurations for various displacements. Working on marine diesel systems requires strict adherence to factory protocols to prevent equipment damage or personal injury during high-pressure system handling. This manual lays out the exact component structures to ensure safe, accurate evaluations before you pick up a wrench.
Technical Data and Service Reference
Accurate data is the backbone of any successful workshop project. This guide provides the exact specifications for cylinder bore, valve clearances, and injection timing needed to keep the 4JH line running at peak performance. It lists torque values, fluid capacities, and wear limits in both metric and imperial units, giving you immediate shop-floor accuracy. Need specific numbers? Standard intake and exhaust valve seat angles are mapped out at 120 and 90 degrees. You will find the connecting rod tightening torque specified precisely at 4.5–5.0 kg-m (32.5–36.1 ft-lb). Furthermore, maximum fuel injection pressure is documented at 195–205 kg/cm² (2,773–2,915 lb/in.²) across the range. It provides everything marine engineers and seasoned DIY mechanics need to properly inspect and understand the 1985-onward engine family.
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