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55 COOLING SYSTEM
The pump shaft is mounted in a permanently
lubricate d double row ball bearing with grooves in
the :shaft to furnish race-way for the bearing balls and
provide a means of taking end thrust of the fan and
pump.
The bearing and shaft are retained in the pump
housing by the shaft bearing retainer.
WATER PUMP REMOVAL
1. Drain the cooling system.
NOTE: It is not necessary to remove the radia-
tor to remove the pump; however, use care
when removing and installing the pump.
2. Loosen the bolt in fan belt and generator adjust-
ing bracket and move generator in toward the
cylinder block to remove the fan belt.
3. Disconnect hose from the water pump inlet.
4. Remove the bolts and nut from the generator
adjusting bracket to cylinder block and remove
bracket.
5. Remove the four bolts and lock washers attach-
ing fan blades to fan pulley and hub, and re-
move the fan blades.
6. Remove bolts attaching water pump to block
and remove the water pump.
DISASSEMBLY
1. Remove the water pump shaft retainer (7) and
old gasket (13), Figure 1.
2. Press out the pump shaft and bearing assembly
with water pump pulley hub attached using
adapter plate between body and pulley hub.
The slotted adapter is placed between the body
and the pulley hub to support the lower part of the
body to eliminate spring-back and possible body
fracture when removing the water pump shaft.
The adapter (J-2778-3) is included in S-2778
Holding Fixture.
The bearing and shaft is serviced as an assembly
only. The water pump pulley hub is not part of the
shaft and must be removed from the old shaft and
installed on the new shaft.
WATER PUMP SHAFT, SEAL AND BEARING
INSPECTION
1. Clean the bore in the pump body and check for
scores and wear.
2. Check the pump body at the area of the impeller
and if the impeller has been scraping the body, it
indicates improper clearance.
3. Check seat and if necessary replace seal. Using a
brass drift and working through hub bore of pump,
drive out seal assembly.
4. Revolve bearing slowly by hand, using hand thrust
load. If bearing does not drag or feel rough, it can
be reused.
5. If steel seals at ends of bearing, outer races are
loose so they can be turned with fingers, the
bearing should be replaced.
6. Worn shafts and shafts with a worn spring retainer
groove should be replaced.
ASSEMBLY
1. Assembly the shaft and bearing in the water pump
body.
NOTE: Bearing should be slight press fit into
pump body, and assembled so that the groove on
the outer race is aligned with the retainer wire slot
in pump body bore.
CAUTION: When pressing bearing and shaft in
housing, press against face of outer ring, not
against shaft.
2. In stall seal assembly (10) as seal outer retainer is
a press fit in pump body. Be sure seal is properly
aligned. Use of a steel tube 1-5/8" outside diameter
will facilitate assembly.
3. Lubricate the shaft with engine oil and press on the
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