Yanmar 1GM10, 2GM20, 3GM30, SHM35 Diesel Engine Service Manual

Comprehensive service documentation for Yanmar 1GM10, 2GM20, 3GM30, and SHM35 marine diesel engines. Covers all mechanical systems and diagnostics. Part Number 0000A0A1361.

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Technical Safety Notice
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This official OEM document is intended for professional technicians and skilled operators. Performing service on mechanical equipment involves inherent risks. By purchasing, you acknowledge that RepairLoader provides original manufacturer data for informational purposes. Always prioritize safety: use correct tools, wear protective gear, and consult a certified professional if you are uncertain of any procedure.

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
Build 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)
Technical Specifications
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Document Number / Seller:
28650 / Lisa Morales
File Size:
13.50 MB
File Type:
PDF
Language:
English
Pages:
463
Printable:
Yes
Category:
Inboard-Engines-Sterndrives
Last updated / verified
Apr 19, 2025

Yanmar Manual Features & Content Preview

Yanmar 1GM10, 2GM20, 3GM30, 3HM35 Service Documentation

  • Covers 1980s–1990s Yanmar 1GM10, 2GM20, 3GM30, and 3HM35 marine diesel engine series, including direct sea-water cooled and fresh-water cooled variants
  • Original OEM publication P/N 0000A0A1361, printed in Japan
  • Contains 463 pages of detailed engine specifications, cross-section diagrams, and service tolerances
  • Files are stored against your account so you can retrieve them after a hard-drive loss
  • Full-text search finds any part number in seconds
  • This 463-page marine diesel engine compendium is the essential reference for internal combustion service, providing factory-defined clearance and torque data for the entire GM and HM product lineup

Internal Engine Systems Coverage

The 1980s–1990s Yanmar 1GM10–3HM35 engine manuals provide comprehensive coverage of all major mechanical systems. Technical prose outlines the construction and inspection parameters for cylinder blocks, including bore wear limits and machining guidelines. The documentation details valve train assembly, covering valve guide protrusion, rocker arm support, and seating dimensions for both intake and exhaust valves. Pistons, connecting rods, and crankshaft assemblies are reviewed with specific assembly-sequence data for main bearing housings and timing gear alignment. Additional chapters explore fuel injection circuits, cooling system modifications, and reduction gear maintenance.

Engine Specification Highlights

Technical data is presented through high-detail tables and cross-sectional illustrations for accurate diagnostic reference. 1GM10–3HM35 cylinder head bolt torque is specified at 6.0 kgf-m (43.4 ft-lb) to 10.0 kgf-m (72.3 ft-lb) depending on bolt diameter. Intake valve clearance is maintained at 0.2 mm for all models. Compression ratios are documented as 23.0 for GM series engines and 24.8 for the 3HM35.

Note: This page is a contents overview for the manual. It does not provide repair or diagnostic instructions.

Manual FAQ, Purchase & Download Details

Are performance curves and engine specification tables included in the document for the Yanmar diesel engine variants? keyboard_arrow_down

Yes, the manual contains detailed performance curves for engine torque and fuel consumption. It also includes comprehensive specification tables for the different cooling and model types.

Does the manual show exploded views of the engine systems for component identification? keyboard_arrow_down

Yes, the document features detailed engine cross-section diagrams that illustrate the construction and positioning of major internal components.

Can I see wiring diagrams or electrical system details within this service manual? keyboard_arrow_down

Manual covers the electrical system and components for the listed models. You will find chapters dedicated to the alternator, starter motor, and instrument panel configurations. These sections include connection references and layout information for the electrical components.

Is information regarding tightening torque and engine clearance specifications listed in this document? keyboard_arrow_down

Specification tables within the manual provide technical data for engine clearances, tightening torque, and other essential fit values.

What publication cues are associated with this service manual? keyboard_arrow_down

Document displays the 0000A0A1361 publication reference number on its cover and within the foreword. It is specifically compiled as a compendium for the 1GM10, 2GM20, 3GM30, and 3HM35 engine series.

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