10. Maintenance of Major Components
10.1. Cooling System
10.1.1. General information
This engine is water-cooling type. Heat from the combustion chamber and engine oil heat are
cooled down by coolant and radiated to the outside, resulting in the normal operation of the
engine.
Looking into the cooling system, the water pumped up by the water pump circulates around
the oil cooler through the water pipe to absorb the oil heat, and then flows through the water
jacket of the cylinder block and water passage of the cylinder head to absorb the heat of the
combustion chamber.
The water absorbing the oil heat and combustion chamber heat goes on to the thermostat
through the water pipe, and circulates to the water pump if water temperature is lower than
the valve opening temperature on the thermostat, while circulating to the radiator at water
temperature higher than the valve opening temperature. At the radiator, the heat absorbed in
the coolant is radiated to cool down and the coolant recirculates to the water pump.
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Specification
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Item Specification
1. Water pump Centrifugal type
type
Delivery About 280 liter/min
Pumping speed 2,234 rpm
Pumping back pressure 760 mmHg
2. Thermostat
Operating temperature 71 ~ 85
ûC
3. Cooling fan and belt
Fan diameter - Number of blades 755 - 7
Fan belt tension 15mm/ deflection by thumb
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