Cooling System
i06512674
Cooling System
The coolant is circulated through the engine by a
centrifugal water pump. The water pump is on the
front of the engine. The water pump has a gear that is
driven by the idler gear. Coolant from the inlet line
goes into the water pump. The rotation of the impeller
in the water pump then pumps the coolant through
the system.
The coolant from the water pump goes through the
engine oil cooler to the coolant jackets in the cylinder
block. From the cooling jackets around the cylinders,
the coolant flows upwards into the cylinder heads.
The coolant returns via a water rail to the housing for
the water temperature regulator. The thermostat
housing has three water temperature regulator
elements. The water temperature regulator elements
determine the direction of the coolant flow depending
on the temperature. When cold, the coolant flow is
directed back via a by-pass pipe to the coolant pump
suction to be recirculated.
With the thermostat open, the coolant is allowed to
enter the radiator. The coolant is cooled by air
blowing over the single core cooling matrix. The hot
air from the turbocharger is directed via a large
diameter air pipe to the aftercooler. The hot air flows
through a single core radiator and is directed through
large bore pipes to the engine air inlet manifold. The
cooling of the charge air is achieved by installing an
extra radiator at the side of the normal coolant
cooling radiator and in the airflow of the cooling fan.
The radiator fan forces air through each matrix in
parallel.
The oil cooler comprises of a tubestack enclosed
within a cast body and sealed by O-rings and joints to
the port covers. The covers are secured by bolts,
setscrews, and spring washers to the body. Oil is
delivered from the lubricating oil pump via a flexible
pipe into the inlet port and into cooler body circulating
around the outside of the tubes. Coolant is delivered
from the water pump and passes from the outlet pipe
to the end cover inlet port. Then passes through the
tubes, and makes one pass in both directions. The
coolant then exits from the outlet port to the water
transfer pipe and into the water jacket.
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