Yanmar 4JH2E / 4JH2-TE / 4JH2-HTE / 4JH2-DTE / 4JH2-UTE Factory Service & Repair Manual • P/N A0A1029-0104, dated April 2001
Yanmar Models Covered & Key Technical Specifications
Models: Yanmar 4JH2E, 4JH2-TE, 4JH2-HTE, 4JH2-DTE, 4JH2-UTE
Sub-models / Variants: KBW20, KBW21, KM3P2, KM4A, marine gear equipped versions
Model Years: 2001
Serial Numbers: A0A1029-0104
Technical Data:
- Injection starting pressure: 195–205 kg/cm² (2,773–2,915 lb/in.²)
- Cylinder bore diameter: 82.00–82.03 mm (3.2283–3.2295 in.)
- Valve stem outside diameter: 7.960–7.975 mm (0.3134–0.3140 in.)
- Intake/exhaust head clearance: 0.2 mm (0.0079 in.)
- Cooling system thermostat opening temperature: 88°C (190.4°F)
- Starter motor electrical rating: 12V DC, 1.4kW
- Fuel injection pump type: YANMAR YPES-4CL
- Alternator capacity: 12V, 55A
Yanmar Manual Features & Content Preview
Yanmar 4JH2E to 4JH2-UTE Marine Diesel Engine Service Manual
- Covers 2001 Yanmar 4JH2E, 4JH2-TE, 4JH2-HTE, 4JH2-DTE, and 4JH2-UTE marine diesel engines, including integrated marine gear and fuel injection system diagnostics.
- Official 406-page Yanmar publication A0A1029-0104, originally issued in April 2001.
- Delivered as an instant download PDF. The fully indexed search covers every chapter and appendix.
- Contains 54 exploded-view diagrams, 14 electrical piping schematics, and 28 torque specification tables for base engine and fuel injection components.
- Suitable for printing individual sections directly for the shop floor to assist with any marine diesel repair planning.
- This first edition serves as the primary reference for all 4JH2-series engines manufactured with the A0A1029-0104 serial designation.
Engine Construction and Component Coverage
The 2001 Yanmar service manual provides highly detailed technical descriptions of engine construction. It is designed to give marine mechanics and technicians a clear overview of the systems before beginning work. Chapters systematically segment the base engine parts. You will find exact cylinder block measurements, piston ring installation parameters, connecting rod inspections, and crankshaft bearing clearances.
Documentation extends to specific fuel injection equipment service data. It outlines governor operation alongside the proper handling procedures for the YPES-4CL fuel injection pump. Further sections detail the cooling system, lubricating oil circuits, and remote control system adjustments. Electrical system diagrams clearly map out starter motor, alternator, and warning device configurations.
Technical Specifications and Workshop Data
Technical data within the publication includes hard wear limits for all major rotating assemblies and valve train components. For example, cylinder head distortion tolerances are strictly documented at 0.05 mm. Valve seat angles are precisely specified for the evaluation of compression performance. Connecting rod twist and parallelism limits are provided to verify overhaul viability. The manual also lists the fuel injection starting pressure for the entire 4JH2 series at 195–205 kg/cm² (2,773–2,915 psi) across all injection nozzle types.
Working on marine diesel systems involves high-pressure fuel lines and heavy rotating components. Qualified technicians must always reference the original OEM documentation as the authoritative source before undertaking maintenance or repair procedures to ensure operational safety.
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