8-2 COOLING AND LUBRICATION SYSTEM
COOLING SYSTEM
DESCRIPTION
The engine is cooled by the forced circulation of engine coolant, using a high-capacity, centrifugal water
pump, through water jackets formed in the cylinder and cylinder head, and through the radiator. The tube-
and-fin type radiator is made of aluminum, which is characterized by lightness in weight and good heat dissi-
pation.
A wax-pellet type thermostat is used to regulate the flow of engine coolant through the radiator. As the cool-
ant temperature rises to about 88°C (190°F) the thermostat valve unseats and a normal coolant flow is
established. At about 100°C (212°F) the thermostat becomes completely open and, as a result, heat is
released to the atmosphere through the radiator core.
COOLING CIRCUIT
OIL COOLER
Oil cooler is setting on the place of oil filter.
The engine oil is cooled by engine coolant, which is circulated
through inside core of oil cooler.
BREATHER
RH
CRANKCASE
CYLINDER
CYLINDER
HEAD
OIL COOLER
COOLANT
TEMPERATURE
SENSOR
COOLING
FAN THERMO
SWITCH
RADIATOR
RESERVOIR
TANK
WATER PUMP
THERMOSTAT
BY-PASS
Oil cooler
Oil filter
: Engine oil flow
: Engine coolant flow
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