Workshop Service and Repair Manual for the Yanmar 2QM20 & 3QM30 engines, an absolute must-have for any Yanmar owner. This full workshop manual covers every component, service and repair procedure in full Yanmar factory specification with clear step by step photographs and technical drawings for the Yanmar 2 and 3 cylinder engines with torque setting values throughout each chapter, this is the most comprehensive service manual available as used by boatyards and independent marine engineers the world over.
CHAPTER 1 GENERAL
1. Exterior Views
2. Specifications
3. Principal Construction
4. Performance Curves
5. Features
6. Engine Cross-Section
7. Dimensions
8. System Diagrams
9. Accessories
10. Recommended Remote Control Gable
CHAPTER 2 BASIC ENGINE
1. Cylinder Block
2. Cylinder Liner
3. Cylinder Head
4. Piston
5. Connecting Rod
6. Crankshaft
7. camshaft
8. Timing Gear.
CHAPTER 3 FUEL SYSTEM
1. Construction
2. Injection Pump
5. Disassembly
3. Injection Valve
6. Reassembly
4. Fuel Filter
5. Fuel Feed Pump
6. Fuel Tank (Option)
CHAPTER 4 GOVERNOR
1. Governor
2. Injection Limiter
3. No-Load Maximum Speed Limiter
4. Idling Adjuster
CHAPTER 5 INTAKE AND EXHAUST SYSTEM
1. Intake and Exhaust System
2. Intake Silencer
3. Exhaust System
4. Breather Pipe
5. Intake Man if old (3QM30(H) 1
CHAPTER 6 LUBRICATION SYSTEM
1. Fuel Oil and Lubricating Oil
2. Oil Pump
3. Oil Filter
4. Oil Pressure Regulator Valve
5. Oil Pressure Measurement
CHAPTER 7 COOLING SYSTEM
A. Sea water cooling [For model 20M2O(H), 30M3O(H)J
1. Cooling System
2. Water Pump and Bilge Pump (Option)
3. Thermostat
4. Anticorrosion Zinc
5. Kingston Cock
6. Bilge Strainer
B. Fresh water cooling (For model 20M2OY{F), 30M3OY(F)J
1. Cooling System
2. Fresh Water Pump
3. Fresh Water Tank
4. Filler Gap and Subtank (Option)
CHAPTER 8 CHAIN-OVERDRIVE HAND-OPERATED SYSTEM
Chain-Overdrive Hand-Operated System
CHAPTER 9 REDUCTION AND REVERSING GEAR
1. Construction
2. Installation and Operation
3. Handling the Reduction and Reversing Gears
4. Inspection and Servicing
5. Disassembly.
6. Reassembly
B. For model 20M2OH
1. Construction
2. Installation
3. Operation and Maintenance
4. Inspection and Servicing
5. Disassembly
6. Reassembly
7. camshaft
C. For model 3QM3OH
1. Construction
2. Installation
3. Operation and Maintenance
4. Inspection and Servicing
5. Disassembly
6. Reassembly
CHAPTER 10 REMOTE CONTROL SYSTEM
1. Construction
2. Clutch and Speed Regulator Remote Control
3. Decompression Remote Control
4. Engine Stop Remote Control
CHAPTER 11 ELECTRICAL SYSTEM
1. Composition
2. Battery
3. Starter Motor
4. Alternator
5. Alarm Circuit
CHAPTER 12 INSTALLATION AND FITTING
1. Propeller Selection
2. Engine Installation
3. Stern Equipment
4. Interior Piping and Wiring
5. Front Power Take-Off
CHAPTER 13 OPERATING INSTRUCTIONS
1. Fuel Oil and Lubricating Oil
2. Engine Operating Instructions
3. Troubleshooting and Repair
CHAPTER 14 DISASSEMBLY AND REASSEMBLY
1. Disassembly and Reassembly Precautions
2. Disassembly and Reassembly Tools
3. Other
4. Disassembly
5. Reassembly
6. Tightening Torque
7. Packing Supplement and Adhesives
CHAPTER 15 INSPECTION AND SERVICING
1 Periodic Inspection and Servicing
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