ENGINE
WG972-E4, WSM
1-M9
3. COOLING SYSTEM
[1] GENERAL
The cooling system consists of a radiator (1), a
centrifugal water pump (4), a suction fan (2) and a
thermostat (3).
The coolant is cooled through the radiator core, and
the fan behind the radiator pulls the cooling air through
the core to improve cooling.
The water pump sucks the coolant from the radiator
or from the cylinder head and forces it into the cylinder
block.
The thermostat opens or closes according to the
coolant temperature, to allow the coolant to flow from the
cylinder block to the radiator while open, or only to the
water pump while closed.
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[2] COOLING FIN
The cooling fin is set up around the oil passage in the
gear case.
Therefore, the temperature of oil is decreased by the
wind generated by the cooling fan.
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[3] WATER PUMP
The water pump is driven by the crankshaft and a V
belt. The rotating impeller (4) in the water pump sucks
the coolant from the radiator and sends it into the water
jacket in the cylinder block.
The mechanical seal (3) prevents the water from
entering the bearing unit (1).
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Thermostat's valve
opening temperature
Factory
specifica-
tion
69.5 to 72.5 °C
157.1 to 162.5 °F
(1) Radiator
(2) Cooling Fan
(3) Thermostat
(4) Water Pump
(5) Cylinder Head
(6) Cylinder Block
(1) Cooling Fin
(1) Bearing Unit
(2) Water Pump Body
(3) Mechanical Seal
(4) Impeller
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