Service Procedure; Water Pump - Subaru XT 1988 Service Manual

l
2-5
ENGINE COOLING SYSTEM
SERVICE PROCEDURE
Water Pump
REMOVAL
1) Drain coolant and disconnect the radiator outlet hose,
water by-pass hose and air vent hose (2700 cc model only)
from the water pump.
2) Loosen pulley nuts so that they can be turned by hand.
3)
Loosen alternator ASSY mounting bolts (1800 cc model).
Loosen belt tensioner pulley locking nut (2700 cc model).
4) Remove drive belt.
5) Remove front belt cover. Refer to
2-3
"Engine Disassem-
bly" for procedures.
Be careful not to spill coolant on drive belt. If spilled, wipe
Fig. 10
clean immediately.
DISASSEMBLY
a.Oo not disassemble water pump unless absolutely necessary.
It is advisable to replace water pump ASSY.
b. In case of disassembling water pump, be sure to check
"run out" of water pump hub after assembling. If it is outside
specifications, replace water pump ASSY.
1)
Remove water pump pulley.
2)
Insert a screwdriver into the slit in water pump case and
lift end of water pump clip.
L2-1035
Fig. 9
3) Extract water pump clip with pliers.
4) Using a press, drive hub from water pump ASSY.
51
Remove shaft, impeller, and mechanical seal from water
pump case as a unit.
Do not press the shaft, or the bearings will be damaged. Press
the bearing outer race.
10
61 Remove impeller from shaft with a press.
INSPECTION
1) Clean all the disassembled parts thoroughly.
2) Inspect the pump shaft for wear, damage, and operation.
3) Inspect the impeller surface that contacts the mechanical
seal for wear and damage.
4) Inspect the mechanical seal and plate for wear, crack and
damage.
5) I nspect the other parts for crack, wear and damage, and
replace if defective.
ASSEMBLY
1) Heat water pump case to a temperature of 80 to 100
o
e,
(176 to 212°FI, and press shaft into bore in water. pump
case. Do not press any section other than outer race.