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 b. Water Pump Assembly. The water pump
j. Air Compressor Lubrication. The air
assembly is mounted on f rent of the cylinder
compressor is lubricated by engine oil from
and crankcase. The pump is belt driven from
the main oil gallery. Oil is directed through
the crankshaft damper and pulley assembly.
drilled passages in the crankcase and the air
The impeller drive shaft rotates in a sealed
compressor support to the air compressor. Oil
double ball bearing housing which does not re-
returning from the compressor drains back
quire periodic lubrication. The double water
into the oil pan through the engine front valve
pump pulley is pressed onto the water pump
tappet chamber.
shaft. The water pump has a bypass connection
which allows coolant from the thermostat hous-
ing to enter for recirculation. Coolant bypasses
the radiator when the thermostat is closed
a. General. The engine is liquid cooled.
during the engine warm-up.
Coolant is circulated throughout the engine
cooling system by the water pump assembly.
c. Fan (figs. 17 and 20). The fan has six
Temperature of the coolant is controlled by the
blades and is attached to the water pump pulley.
thermostat. Front and rear cylinder head water
It provides proper air circulation through the
outlet manifolds maintain an equal distribution
vehicle radiator.
of coolant around each cylinder head.
13
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