User Manual

10 SENR9977
Systems Operation Section
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Cooling S ystem
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Illustration 6
Flow diagram of the cooling system
The coolant flows from the bottom of the radiator to
the centrifugal water pump. The water pump assists
in the flow of the coolant through the system. The
water pump is installed on the front of the timing
case. The water pump is gear-driven by the fuel
injection pump gear.
The water pump forces the coolant through a
passage in the front of the timing case to the water
jacket in the top left side of the cylinder block. The
coolant continues to the rear of the cylinder block.
The main flow of the coolant passes from the rear of
the cylinder block into the rear of the cylinder head.
The coolant flows forward through the cylinder head
and into the water temperature regulator housing. If
the water temperature regulator is closed, the coolant
goes directly through a bypass to the inlet side of
the water pump. If the water temperature regulator
is open, the bypass is closed and the coolant flows
to the top of the radiator.
From the rear of the cylinder block, some of the
coolant passes into the oil cooler. The oil cooler is
located on the left side of the cylinder block with no
external lines. The coolant flows around the element
of the oil cooler before being returned to the rear of
the cylinder block.