Perkins 1104D NH1 Systems Operation Testing And Adjusting page 15

RENR7967
Coolant Flow
Illustration 16
Coolant flow
(1) Radiator
(2) Water pump
(3) Cylinder block
(4) Engine oil cooler
(5) Cylinder head
The coolant flows from the bottom of the radiator (1)
to the centrifugal water pump (2). The water pump
(2) is installed on the front of the timing case. The
water pump is driven by a gear. The gear of the fuel
injection pump drives the water pump gear. The
water pump forces the coolant through a passage in
the timing case to the front of the cylinder block (3).
The coolant enters a passage in the left side of the
cylinder block (3). Some coolant enters the cylinder
block. Some coolant passes over the element of the
oil cooler (4). The coolant then enters the block (3).
Coolant flows around the outside of the cylinders
then flows from the cylinder block into the cylinder
head (5).
The coolant flows forward through the cylinder
head (5). The coolant then flows into the housing
of the water temperature regulator (6). If the water
temperature regulator (6) is closed, the coolant goes
directly through a bypass (7) to the inlet side of the
water pump. If the water temperature regulator is
open, and the bypass is closed then the coolant flows
to the top of the radiator (1).
(6) Water temperature regulator (thermostat)
and housing
(7) Bypass for the water temperature
regulator (thermostat)
Systems Operation Section
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