Pontiac FIREBIRD 1972 Service Manual page 547

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SIX CYLINDER ENGINE 6-35
UPPER
1
LOWER
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Fig. 6-53 Rear-Main Bearing Oil Seal
5. To remove the upper half of the seal, use a small
hammer and brass pin punch to tap one end of oil seal
(Fig. 6-54) until it protrudes far enough to be
removed with pliers. Push new seal into place with lip
toward engine front.
6. Install bearing cap and torque bearing cap bolts to 65
lb. ft.
Fig. 6-54 Removing Oil Seal
7. Install oil pan.
M A I N BEARINGS
The main bearings are of the precision insert type and do
not utilize shims for adjustment. If the clearances are
found to be excessive, a new standard or undersize bearing
insert, both upper and lower halves, will be required.
REMOVE
1. Remove oil pan.
2. Remove cap on main bearing requiring replacement
and remove bearing from shell.
If a tool is not available, a cotter pin may be bent to
do the job as shown in Fig. 6-55. It may be necessary
to remove oil pump when removing number 6 main
bearing cap.
3. Rotate the crankshaft clockwise as viewed from front
of engine. This will roll upper bearing shell out of
engine.
REPLACE
1. Oil new upper bearing shell and insert plain (un-
notched) end of shell between crankshaft and in-
dented or notched side. Rotate the bearing into place.
2. Install new bearing shell in bearing cap.
3. Check bearing clearance using plastic gage method as
outlined below.
1
Fig. 6-55 Tool for Removing Upper Half of Main Bearing