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 jack-
et of the cylinder block and water passage of the cylinder head to absorb the heat of the com-
bustion 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 temper-
ature 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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