COOLING SYSTEM 21
General description
Coolant from the bottom of the radiator passes
through the centrifugal coolant pump, which is fitted
onto the front of the timing case to assist the flow
of the coolant through the system.
The pump is gear driven from the gear of the fuel
injection pump.
On certain applications the pump is driven by a "V"
belt from the crankshaft pulley.
From the pump, the coolant passes through a
passage in the timing case.
Coolant pumps driven by a "V" belt pass the
coolant through the pump body to the front of the
cylinder block.
On four cylinder engines the coolant passes
through a passage in the left side of the cylinder
block to the rear of the cylinder block.
If a lubricating oil cooler is fitted, some of the
coolant passes around the element of the cooler
and then to the rear of the cylinder block.
If the oil cooler is fitted on the left side of the
engine, coolant from the by-pass connection at the
rear of the coolant pump passes through a pipe to
the oil cooler.
If the oil cooler is fitted to the right side of the
engine, a pipe is connected between the thermostat
housing and the oil cooler. The coolant passes
around the plates of the cooler and passes through
a pipe to the cylinder block.
Some four cylinder engines have a plate type oil
cooler fitted between the oil filter canister and the
oil filter head.
The coolant then passes around the cylinders and
up into the cylinder head. The coolant leaves the
cylinder head at the front and passes into the
thermostat housing.
If the thermostat is closed, the coolant goes directly
through a by-pass to the inlet side of the coolant
pump. If the thermostat is open, the thermostat
closes the by-pass and the coolant passes to the
top of the radiator.
On six cylinder engines the coolant divides as it
enters the cylinder block. Most of the coolant
passes along the right hand side of the cylinder
block and around the outside of the cylinders to the
rear of the cylinder block.
The remainder of the coolant passes along a
passage on the left hand side of the cylinder block
to the lubricating oil cooler.
The coolant flows around the element of the
lubricating oil cooler to the rear of the cylinder
block. The coolant then passes to the rear of the
cylinder head.
Coolant passes forward through the cylinder head
and into the thermostat housing. These engines
have two thermostats. If the thermostats are closed,
the coolant goes, through a by-pass, directly to the
inlet side of the coolant pump. If the thermostats
are open, the coolant passes to the top of the
radiator.
Perkins Phaser/1000 Series, April 1995 21A.03
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