Pinion Bearing Oil Seal; Remove Axle Shaft Assemblies - Pontiac Grand Prix Service Manual

STANDARD DIFFERENTIAL 4A-9
3: however, if reading obtained in step 3 was less than
12 lb. in., increase preload to 16 lb. in.
2. connect universal joints. Install lock plates and
tighten U-joint to companion flange U-bolt nuts to 12
lb. ft. torque. If lockwashers are rued, tighten U-bolts
nuts to 14 lb. ft. torque.
PINION BEARING OIL SEAL
REMOVE
NOTE: Check pinion bearing preload before removing
companion flange. Proper preload can then be
maintained i f inspection of the flange after removal
shows damage requiring replacement.
1. With rear wheels off floor, turn rear wheels and tap
brake backing plates with a soft hammer to ensure
that brakes are free.
2. Remove U-bolts which hold rear universal joint to
companion flange. Use a heavy rubber band or tape to
hold bearings onto journal to prevent loss of bearing
rollers when joint is disconnected if tie wire has been
removed (Fig. 4A-5).
3. Scribe a line on end of pinion stem, extending down
along side of stem threads and onto companion flange
nut.
4. Punch a small mark on the line at pinion stem end
and at top of lock nut, close to pinion stem threads.
5. Using a lb. in. torque wrench with a 1/2" drive
adapter and socket placed over drive pinion nut, turn
two or three revolutions to ensure free movement.
Then, take a torque reading while rotating pinion to
measure bearing preload (Fig. 4A-6). Record reading.
NOTE: Additional clearance to check preload cnn b~
obtained between differential and body by raising body a
fao inches by means of a jack or stand placed under
fiame at rear.
6. Count the number of exposed threads from top of
pinion stem to lock nut. Remove lock nut with a heavy
duty socket, while holding companion flange with J
86 14- 1 (Fig. 4A-7).
7. Remove companion flange, using puller J 8614-2
.
snd 3 (Fig. 4A-8).
8. Remove oil seal by prying it out of carrier with a
pointed tool, using care to keep tool away from the
exposed front bearing. Discard seal.
CAUTION: Use care to keep dirt and other foreign
matter out of exposed front pinion bearing.
.
REPLACE
1. Lubricate lip of new seal with clean gear lube. Coat
outer diameter of seal case with suitable sealer. Install
seal by tapping into place, using J 21285-01 (Fig.
4A-9).
2. Before installing companion flange, inspect for nicks,
scratches or burred surfaces that may damage the seal.
If any such damage is evident, hone carefully or install
new flange.
a. If a new companion flange is installed, refer to step
2 under COMPANION FLANGE - REPLACE.
b. Inspection shows the original companion flange to
be satisfactory, replace by holding companion flange
with J 8614-1 and install nut to exactly the same
position as before. Make sure punched holes and
scribe line are in alignment. Tighten lock nut , a n
additional 1 /32" beyond this alignment.
CA UTION: DO NOT exceed the additional tightening
of the nut by a distance of more than 1/32" from its
original position, as tightening the nut in excess of this
amount will disturb the pinion and ring gear tooth
contact pattern.
3. Connect rear universal joint. Install lock plates and
tighten U-joint to companion flange U-bolt nut to 12
lb. ft. torque. If lockwashers are used, tighten U-bolt
nuts to 14 lb. ft. torque.
AXLE SHAFT, AXLE SHAFT BEARING, BEARING OIL
SEAL ANWOR WHEEL BOLT-REMOVE
REMOVE AXLE SHAFT ASSEMBLIES
Design allows for axle shaft end play up to .032". This
end play can be checked with the wheel and brake
drum removed by measuring the difference between
the end of the housing and the axle shaft flange while
moving the axle shaff in and out by hand.
End play over .032" is excessive. Inserting a shim
inboard of the bearing to compensate for the end play
Fig.
4A-9
Installing Pinion Oil Seal