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3.5.4 COOLING SYSTEM:
The function of the cooling system is to absorb and dissipate heat generated during combustion thereby
maintaining engine coolant temperature as per designed parameters. To ensure the same the engine is
cooled by forced circulation of coolant by the water pump. Radiator cooling fan driven by the V Belt from the
water pump pulley charges cold air through the radiator fins which carries away the heat from the coolant.
This continuous process of circulation and heat dissipation ensures the operating temperature of the engine
is maintained.
The coolant temperature around the combustion chamber should be maintained at optimum levels for
satisfactory performance of the engine. It takes more time to achieve the desired operating temperatures at
low ambient temperatures, engine warm up periods and light loading conditions. Hence a thermostat is
installed in the cooling system which controls the coolant temperature around the combustion chamber to
the desired level all times during engine operation.
WATER PUMP:
The water pump is of centrifugal type and it is
driven by the V-belt from the crankshaft
pulley. A unit seal is installed between the
impeller and Water pump to prevent leakage
of coolant. There is drain hole provided at the
bottom of the water pump case which
ensures that coolant, should it leak from the
unit seal, does not enter the bearings. The
water pump is mounted on the timing gear
case provided with a suction pipe and swirl
chamber. Pressed into one end of the water
pump shaft is the impeller with backward
blades which feeds coolant under pressure
into the engine.
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