Description
Yanmar 1GM10 2GM20 3GM30 3HM35 Service Manual is the factory technical publication for the specified Yanmar marine diesel engines and their associated marine gears. It covers 1GM10(C), 2GM20(F)(C), 3GM30(F)(C) and 3HM35(F)(C) engine variants.
This 239-page manual is intended for marine engineers, diesel technicians and workshops carrying out inspection, servicing, adjustment, dismantling and reassembly. It provides model identification information, specifications, construction details, performance curves, dimensions and piping diagrams alongside system-specific service instructions.
Coverage includes both direct seawater-cooled and fresh-water-cooled engine arrangements where applicable. The publication also addresses the reduction and reversing gears specified for these engines, remote controls, electrical equipment, operating information and fault diagnosis.
ENGINE IDENTIFICATION AND GENERAL DATA
The opening section explains engine and clutch identification, including the location of model plates and stamped engine serial numbers. General technical information includes:
- Engine and clutch model identification
- Cylinder numbering conventions
- Direct seawater-cooled engine specifications
- Fresh-water-cooled engine specifications
- Principal engine construction
- Performance curves
- Engine cross-sections and dimensions
- Cooling and lubrication piping diagrams
BASIC ENGINE
The Yanmar 1GM10 2GM20 3GM30 3HM35 Service Manual provides service information for the principal mechanical engine assemblies, supporting systematic inspection and overhaul work.
- Cylinder block
- Cylinder head
- Pistons
- Connecting rods
- Crankshaft
- Flywheel and housing
- Camshaft
- Timing gears
FUEL, GOVERNOR AND AIR SYSTEMS
Fuel-system coverage follows the diesel supply and injection equipment, while separate governor information addresses engine-speed control and limiting devices.
- Fuel-injection system
- Injection pump
- Injection nozzles
- Fuel filter and feed pump
- Optional fuel tank
- Governor and injection limiter
- No-load maximum-speed limiter
- Idling adjuster and engine stop lever
- Intake silencer, exhaust system and breather
LUBRICATION AND COOLING SYSTEMS
Separate chapters cover lubrication, direct seawater cooling and fresh-water cooling. The manual also explains modification from a seawater-cooled arrangement to fresh-water cooling.
- Forced lubrication circuit
- Oil pump and oil filter
- Oil-pressure regulator valve
- Oil-pressure measurement
- Seawater pump
- Fresh-water pump
- Heat exchanger
- Thermostat and temperature switch
- Cooling-system modification and installation precautions
MARINE GEARS AND REMOTE CONTROLS
The marine transmission section covers reduction and reversing gear construction, servicing, dismantling and reassembly for the applicable engine installations. Identified gear coverage includes KM2P, KM3P and KM3V units, together with the separate gear arrangement specified for the 3GM35(F).
- Gear construction and installation
- Shifting devices
- Inspection and servicing
- Disassembly and reassembly
- Power-transmission arrangement
- V-drive gear specifications and piping
- Shaft shim and backlash adjustment
- Clutch and speed-regulator remote control
- Engine-stop remote control
ELECTRICAL SYSTEM
Electrical-system information supports diagnosis and service of the engine starting, charging and instrumentation equipment.
- Electrical-system layout
- Battery
- Starter motor
- Standard 12 V 55 A alternator
- Optional 12 V 35 A alternator
- Instrument panel
- Tachometer
TROUBLESHOOTING AND REPAIR
Operating instructions identify the required fuel and lubricating oils and explain normal engine operation. A dedicated troubleshooting and repair section assists with systematic fault investigation. The manual concludes with direct seawater-cooled engine dismantling and reassembly instructions.
- Fuel and lubricating-oil guidance
- Engine operating instructions
- Troubleshooting and repair
- Disassembly and reassembly precautions
- Required service tools
- Engine dismantling sequence
- Engine reassembly sequence
YANMAR 1GM10 2GM20 3GM30 3HM35 SERVICE MANUAL COVERAGE
- 1GM10(C)
- 2GM20(F)(C)
- 3GM30(F)(C)
- 3HM35(F)(C)
MANUAL DETAILS
- Manufacturer: Yanmar
- Manual type: Service manual
- Machine type: Marine diesel engine
- Page count: 239
- Publication number: 0000A041361
This factory manual is suitable for workshops maintaining the listed Yanmar marine engines and related marine gear installations. Its model-specific specifications, diagrams and service sequences provide a practical reference for both routine technical work and major engine repairs.
Always confirm the engine and clutch model plates before ordering parts or beginning work, as the manual notes that component specifications may have changed during production.
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