Yanmar 2QM20, 2QM20H,3QM30, 3QM30H marine diesel engine service manual

Product Information

Table of Contents

1. GENERAL

• Engine Views
• Specifications
• Periodic Service
• Special Tools
• Troubleshooting

2. BASIC ENGINE

• Cylinder Block
• Gear Housing
• Flywheel Housing
• Lubrication Oil Sump
• Main Metal Housing
• Camshaft
• Timing Gear
• Cylinder Head
• Valve and Valve Mechanism
• Piston and Piston Pin
• Connecting Rod
• Crankshaft
• Lubrication Oil System
• Cooling Water System
• Turbocharger
• Starter 12V - 1.2KW
• Starter 12V - 1.4KW
• Generator 12V - 35A
• Generator 12V - 55A
• Sea Water Pump

3. FUEL SYSTEM

• Fuel Injection Pump
• Fuel Injection Valve
• Fuel Feed Pump
• Fuel Filter
• Intake Manifold
• Silencer
• Exhaust Manifold
• Exhaust Elbow
• Thermostat

4. GOVERNOR

• Governor Operation
• Speed Control Lever

5. INTAKE AND EXHAUST SYSTEM

• Air Silencer
• Exhaust Manifold
• Exhaust Elbow

6. LUBRICATION SYSTEM

• Oil Cooler
• Oil Filter
• Oil Pump

7. COOLING SYSTEM

• Fresh Water Cooling Pump
• Sea Water Pump
• Heat Exchanger
• Thermostat
• Cooling Water Temperature Sensor
• Zinc Anode for Heat Exchanger

8. SEA WATER PUMP

• Sea Water Pump

9. REDUCTION AND REVERSING GEAR, REMOTE CONTROL SYSTEM

• Reduction and Reversing Gear
• Marine Gear Oil Pump
• Flexible Mounting
• Remote Control System

10. ELECTRICAL SYSTEM

• Starter Motor
• Generator
• Electrical Wiring

11. INSTALLATION AND FITTINGS

• Bedplate
• Flexible Mounting
• Piping

12. OPERATION

• Running-In Operation
• Starting
• Stopping

13. DISASSEMBLY AND REASSEMBLY

• Engine Proper
• Reduction and Reversing Gear

14. INSPECTION AND SERVICING

• Engine Proper
• Reduction and Reversing Gear

This repair manual is an essential tool for mechanics, technicians, and owners of Yanmar Marine 2QM20, 2QM20H,3QM30, 3QM30H diesel engines. It offers detailed instructions and procedures for maintenance, troubleshooting, and repair, allowing users to effectively service and maintain their engines.

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