Yanmar 3JH3/4JH3 Marine Diesel Engine Service Manual

Covers Yanmar 3JH3(B)(C)E(A), 4JH3(B)(C)E, and 4JH3CE1 marine diesel engines. Includes detailed procedures for inspection, servicing, and repair. Ref: HINSHI-H8009

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Document Details

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Document Number / Seller:
28652 / Rebecca Campbell
File Size:
11.79 MB
File Type:
PDF
Language:
English
Pages:
305
Printable:
Yes
Category:
Inboard Engine (Sterndrive)
Last updated / verified
Jan 10, 2026

Models Covered & Key Technical Specifications

Yanmar 3JH3/4JH3 Marine Diesel Service Manual: Yanmar 3JH3/4JH3 Marine Diesel Service Manual (305 P.) | Factory Grade Field-Reference

Yanmar Engine Architectures | Packet.

  • Documented Engine Identification: For engine identification, 3-cylinder (3JH3) and 4-cylinder (4JH3) configurations defines the core engine logic.
  • Calibrated Reservoir Specs: For optimal operation, 71-85°C defines the thermostat regulation Framework.
  • Authorized Production Rate: 29.4 kW -- signifies the active output for the 3JH3E Threshold.
  • Maximum System Capacity: The fuel tank requires 30 liters for standard operation Logic.
  • System Electrical Load: Maximum output reaches 41.2 kW Parameters.
  • Principal Spacing Data: The marine gear requires 2.33:1 to 3.30:1 reduction ratios Benchmarks.

Professional Workshop Service Manual & Technical Specifications

Technical Calibration Repair Manual: Inboard Engine (Sterndrive) Technical Yanmar 3JH3/4JH3 Marine Diesel Service Manual (175 P.) | Factory Grade Field-Reference

Year-Coverage: 2002-Current // Year-Coverage: Marine Diesel Engine / Inboard Engine Logic // Specification-Class: Technical Documentation.

Assessment-Parameter Rating Architecture
Engine Family Yanmar Marine Diesel
Control System EPA Certified Fuel Injection
Displacement 1.642L – 2.193L Vertical water-cooled four-cycle

Cataloging major assemblies into sections covering general information, engine identification, fuel injection equipment, lubrication systems, cooling systems, and more. This manual provides essential diagnostic and repair procedures for Yanmar 3JH3 and 4JH3 series marine diesel engines. It details component specifications, disassembly, reassembly, and troubleshooting for key systems. Procedures for inspecting and servicing basic engine parts are thoroughly documented. The manual also includes specific guidance on intake and exhaust systems, and the reversing gear mechanism. Effectively requiring proper maintenance and repair for optimal service interval reliability.

This extensive documentation covers all aspects of engine operation and maintenance, including detailed system specifications and troubleshooting guides. Diagrams and procedures are provided for complex systems such as the fuel injection equipment and the cooling water system. Repair guidance for the reduction and reversing gear is also included.

FAQ

Specify the **applicable** lubrication requirements keyboard_arrow_down

1.5 L is the total oil capacity for the 3JH3 engine, and 0.45L for the 4JH3 engine, as documented in the Lubrication System chapter.

What is the **exact** testing parameters keyboard_arrow_down

19.6 MPa is the injection pressure, as specified for the fuel injection pump in the Fuel Injection Equipment section.

Calculate the **specific** diagnostic procedures keyboard_arrow_down

Chapter 7 outlines diagnostic procedures for the Reduction and Reversing Gear, including wear limits for key components like drive cones and gears.

What values **designated** fluid capacity requirements keyboard_arrow_down

0.35 L is the total capacity for the Lube oil pan in the 3JH3 engine, and 0.45 L for the 4JH3 engine.

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Reviews (5)

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The troubleshooting section saved me a lot of time. Great manual overall!
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Rated 4 out of 5 stars
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Had a few questions during my first use, but the support team was quick to respond and very helpful. Highly recommend!
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The Yanmar Marine Diesel Engine Service Manual is a must-have for anyone working with these engines. The diagrams are particularly helpful!
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Rated 5 out of 5 stars