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TM 10-3930-671-24
CYLINDER BLOCK COOLANT DRAINS When the
cooling system is to be completely drained, there is a
drain plug on the right hand side of the cylinder block
which drains all coolant which might be trapped in the
base of the block.
WATER PUMP
The water pump is located on the front of the cylinder
block and is driven by the fan belt from the crankshaft
pulley. The inlet of the water pump is connected to the
lower radiator connection and the outlet flow from the
pump is through integral passages cast in the block.
No lubrication of the pump is required as the bearings
are of the permanently sealed type and are packed with
special lubrication for the life of the bearing.
The water pump requires no attention other than bearing
replacement when it shows excessive looseness or if a
coolant leak develops which shows a damaged or badly
worn seal that needs replacement.
REMOVING WATER PUMP
The water pump assembly can be removed from the
engine as a unit for service or repair in the following
manner:
1.
Drain coolant.
2.
Remove fan by taking out four cap screws.
3.
Loosen alternator so that fan belt can be slacked
off enough to slide over pulley.
4.
Remove fasteners holding the pump body to the
front of the block and remove the pump
assembly.
DISASSEMBLY OF WATER PUMP
When replacement of any internal parts becomes
necessary, disassembly must be in the following
sequence in order to prevent damage to the pump.
1.
Use puller to remove fan hub from shaft.
2.
Remove countersunk screws holding cover and
remove cover and gasket.
3.
Use puller to remove impeller taking precautions
to prevent damage to the casting.
4.
Remove seal.
5.
Remove lock rings holding bearing and shaft
assembly in body after which shaft can be forced
out through the front with an arbor press or lead
hammer. DO NOT ATTEMPT TO DRIVE
WATER PUMP SHAFT OUT THROUGH REAR
OF HOUSING. To do so will damage the
housing beyond repair.
F-149
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