Yanmar JH4 Series Marine Engine Service Manual - 2007

Shop manual for Yanmar JH4 series marine engines, covering diagnostics, removal sequences, and maintenance procedures for engine systems and components. P/N: 0BJH4-G00102.

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Document Details

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Document Number / Seller:
28656 / Deborah Robinson
File Size:
82.55 MB
File Type:
PDF
Language:
English
Pages:
392
Printable:
Yes
Category:
Inboard Engine (Sterndrive)
Last updated / verified
Jan 1, 2025

Models Covered & Key Technical Specifications

Yanmar JH4 Series (3JH4E, 4JH4AE, 4JH4-TE, 4JH4-HTE) Service Manual - 2007

This manual covers the following Yanmar JH4 series marine engines:

  • 3JH4E
  • 4JH4AE
  • 4JH4-TE
  • 4JH4-HTE

Engine Specifications and Maintenance Guide | Genuine Yanmar Marine Engine Manual.

  • General Information: Includes key engine specifications for all JH4 series models, detailing bore, stroke, displacement, and compression ratios across different configurations.
  • Test and Adjustment Specifications: Outlines procedures for cylinder compression tests, specifying acceptable pressure ranges for each model variant.
  • Repair Specifications: Details critical dimensions and tolerances for engine components like cylinder heads, valves, pistons, and crankshafts to ensure proper assembly and function.
  • Special Torque Chart: Provides essential torque values for critical fasteners, ensuring correct tightening during assembly and maintenance procedures.
  • Measuring Instruments: Lists the specialized tools required for accurate measurement and inspection of engine components during repair and maintenance.
  • Disassembly Procedures: Offers step-by-step instructions for dismantling the engine, including detailed figures and notes for each major component removal.

Professional Workshop Service Manual & Technical Specifications

Yanmar JH4 Series Workshop Service Manual: 3JH4E, 4JH4AE, 4JH4-TE, 4JH4-HTE Marine Engines - Diagnostics & Repair

Asset-ID: JH4-Service-Manual // Serial-Range: All Models // Procedure-Type: Repair & Maintenance Procedures

Specification System-Path Validation-Data
Engine Model Specifications Various Models
Disassembly Step-by-step Procedures Detailed Figures
Inspection Component Checklists Measurement Limits
Maintenance Schedule Interval-Based Tasks OEM Guidelines
Torque Specifications Fastener Tightening Values Critical Assembly
Special Service Tools Required Measurement Instruments Repair Precision

The manual presents information on the engine structure, specifications, and maintenance procedures for the Yanmar JH4 series. It details the disassembly, inspection, and reassembly of the 3JH4 and 4JH4 Series engines, providing critical data for service professionals.

Key Systems Documented: This manual covers engine systems including the fuel system, cooling system, lubrication system, and electrical system, offering specific maintenance and repair guidance for each.

Repair and Component Procedures: Detailed procedures are provided for component inspection, including cylinder block, cylinder head, pistons, crankshaft, camshaft, and valves, ensuring all parts meet specified limits.

This documentation provides comprehensive coverage for Yanmar JH4 series marine engines, facilitating effective diagnostics, maintenance, and repair operations.

FAQ

What are the **proper** clearance measurements for the valve guides? keyboard_arrow_down

3JH4E/4JH4AE intake valve guides standard dimensions are 8.010-8.025 mm, with a limit of 8.2 mm. Exhaust guides are 8.015-8.030 mm standard, with a 8.2 mm limit.

Specify the **standard** torque specifications for cylinder head bolts. keyboard_arrow_down

For 3JH4E/4JH4AE cylinder head bolts (M10 x 1.25), the standard torque is 88.2 ± 3.0 N·m (65.1 ± 2.2 lb-ft), coated with lubricating oil.

What are the **necessary** safety precautions when working with the fuel system? keyboard_arrow_down

Always ensure the engine is in a well-ventilated area and never block ventilation when the engine is operating, as internal combustion engines produce carbon monoxide gas.

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The Yanmar JH4 Series Service Manual is incredibly detailed and easy to follow. Downloading it was a breeze, and I received the email with the link promptly. Highly recommend this for anyone working on these engines!