Service manual
Table Of Contents
- Cover
- History of Revision
- FOREWORD
- CONTENTS
- FOR SAFETY
- 1. General
- 2. Inspection and adjustment
- 2.1 Periodic maintenance schedule
- 2.2 Periodic inspection and maintenance procedure
- 2.2.1 Check before starting
- 2.2.2 inspection after initial 50 hours or one month operation
- 2.2.3 Inspection every 50 hours or monthly
- 2.2.4 Inspection every 100 hours six months
- 2.2.5 Inspection every 150 hours or one year
- 2.2.6 Inspection every 250 hours or one year
- 2.2.7 Inspection every 1,000 hours or four years
- 2.3 Adjusting the no-load maximum or minimum speed
- 2.4 Sensor Inspection
- 2.5 Thermostat inspection
- 2.6 Adjusting operation
- 2.7 Long storage
- 3. Troubleshooting
- 4. Disassembly and reassembly
- 5. Inspection and servicing of basic engine parts
- 6. Fuel injection equipment
- 6.1 Fuel Injection pump/governor
- 6.1.1 Fuel system diagram
- 6.1.2 Fuel injection pump service data and adjustment
- 6.1.3 Fuel injection pump structure
- 6.1.4 Removing a fuel injection pump
- 6.1.5 Installing a fuel injection pump
- 6.1.6 Adjusting fuel injection timing
- 6.1.7 Troubleshooting of fuel injection pump
- 6.1.8 Major faults and troubleshooting
- 6.2 Fuel feed pump
- 6.3 Fuel filter
- 6.4 Fuel tank
- 6.1 Fuel Injection pump/governor
- 7. Intake and exhaust system
- 8. Lubrication system
- 9. Cooling water system
- 9.1 Cooling water system
- 9.2 Seawater pump
- 9.3 Fresh water pump
- 9.4 Heat exchanger
- 9.5 Pressure cap and coolant recovery tank
- 9.5.1 Pressure cap construction
- 9.5.2 Pressure cap pressure control
- 9.5.3 Pressure cap inspection
- 9.5.4 Replacing filler neck
- 9.5.5 Function of the coolant recovery tank
- 9.5.6 Specifications of coolant recovery tank
- 9.5.7 Mounting the coolant recovery tank
- 9.5.8 Precautions on usage of the coolant recovery tank
- 9.6 Thermostat
- 9.7 Bilge pump and bilge strainer (Optional)
- 10. Reduction and reversing gear
- 11. Remote control (Optional)
- 12. Electrical system
- 13. Service standards
- 14. Tightening torque for bolts and nuts
- Colophon
- Back cover
9. Cooling water system
157R1
9. Cooling water system
9.1 Cooling water system
The cooling water system is of the indirect seawater cooled, fresh water circulation type. The cylinders,
cylinder heads and exhaust manifold are cooled with fresh water, and fresh water cooler (heat
exchanger) use seawater.
Seawater pumped in from the sea by the seawater pump goes to the heat exchanger, where it cools the
fresh water. Then it is sent to the mixing elbow and is discharged from the ship with the exhaust gas.
Fresh water is pumped by the fresh water pump to the cylinder jacket to cool the cylinders and the
cylinder head. The fresh water pump body also serves as a discharge passageway (line) at the cylinder
head outlet and is fitted with a thermostat.
The thermostat is closed when the fresh water pump temperature is low, immediately after the engine is
started and during low load operation, etc. Then the fresh water flows to the fresh water pump inlet, and
is circulated inside the engine without passing through the heat exchanger.
When the temperature of the fresh water rises, the thermostat opens, fresh water flows to the heat
exchanger, and it is then cooled by the seawater in the tubes as it flows through the cooling pine. The
temperature of it flows through the cooling pine. The temperature of the fresh water is thus kept within a
constant range by the thermostat.
P
P
Seawater circuit
Fresh water circuit
Thermostat
Seawater pump
Sea cock
Fresh water pump
Heat exchanger
Coolant recovery tank
Mixing
elbow
Cylinder head
Cylinder block