Yanmar 1GM10, 2GM20, 3GM30, SHM35 Diesel Engine Service Manual • Part Number 0000A0A1361
Yanmar Models Covered & Key Technical Specifications
Models: Yanmar 1GM10, 2GM20, 3GM30, 3HM35
Sub-models / Variants: 1GM10(C), 2GM20(F)(C), 3GM30(F)(C), 3HM35(F)(C)
Trade Names: GM Series, HM Series
Model Years: 1980s–1990s
Technical Data:
- Engine type: Vertical 4-cycle water cooled diesel
- Combustion system: Swirl pre-combustion chamber
- Engine displacement: 0.318 L (1GM10), 0.636 L (2GM20), 0.954 L (3GM30), 1.282 L (3HM35)
- Compression ratio: 23.0 (1GM, 2GM, 3GM), 24.8 (3HM35)
- Fuel injection timing: b.TDC 15±1 degrees (1GM/2GM), b.TDC 18±1 degrees (3GM30), b.TDC 21±1 degrees (3HM35)
- Lubrication system: Complete enclosed forced lubrication
- Starting system: Electric and manual (1GM/2GM), Electric (3GM/3HM)
Yanmar Manual Features & Content Preview
Yanmar 1GM10, 2GM20, 3GM30 & 3HM35 Factory Service Manual
This 463-page factory manual provides the foundational data needed for any serious repair on 1980s–1990s Yanmar 1GM10, 2GM20, 3GM30, and 3HM35 marine diesel engines. Available as an instant download, the fully searchable PDF lets you quickly pull up specific part numbers, torque specs, or clearances right at your workbench. Files are securely saved to your account for easy retrieval, ensuring you never lose access to your documentation.
This OEM publication (P/N 0000A0A1361) covers both direct sea-water and fresh-water cooled variants.
Internal Engine Systems
The documentation breaks down all major mechanical components with high-resolution cross-section diagrams. You will find exact factory tolerances for cylinder blocks, including bore wear limits and machining guidelines. The manual details the entire valve train assembly. This includes seating dimensions, valve guide protrusion, and rocker arm support data for intake and exhaust valves.
Piston, connecting rod, and crankshaft assemblies are mapped out alongside specific assembly sequences for main bearing housings and timing gear alignment. Additional sections detail fuel injection circuits, cooling system routing, and reduction gear maintenance.
Engine Specification Highlights
Accurate diagnostic work relies on precise factory data. For example, 1GM10–3HM35 cylinder head bolt torque is specified between 6.0 kgf-m (43.4 ft-lb) and 10.0 kgf-m (72.3 ft-lb), depending on the exact bolt diameter. Intake valve clearance sits at a strict 0.2 mm across all models. The documentation also lists baseline compression ratios: 23.0 for the GM series and 24.8 for the 3HM35.
Note: This page outlines the contents of the OEM manual and does not serve as a step-by-step guide for repairing the engine itself. Always review the factory safety procedures detailed in the documentation before tearing down any marine diesel equipment.
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