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4-16
9. Hold the drive pinion flange
and remove the pinion nut (Refer
Fig.
21 ).
Remove the spring washer.
10.
Remove the pinion flange (Page
4-11 Fig.
22.)
11. With a soft-faced hammer,
drive the pinion out of the front
bearing cone and remove it through
the rear of the carrier casting.
12. Drive
against
the
pinion
front bearing cone, and drive the
FIG.
33 -Differential
Bearing Removal
FIG.
34-Differential
Bearing Installation
EI478·A
pinion flange seal and the bearing
cone out of the carrier casting.
13. If the pinion bearings cups
are to be replaced, drive them out
of the carrier casting with a drift.
Install the new cups with the tools
4615HF and 4625HR.
Make sure
the cups are properly seated in
GROUP
4-REAR AXLE
their bores. If a 0.0015 inch feeler
gauge can be inserted between a
cup and the bottom of its bore at
any point around the cup, the cup
is not properly seated.
14. Remove
the
pinion
rear
bearing cone (See Fig. 38 ).
INSPECTION AFTER REMOVAL
AND DISASSEMBLY
Thoroughly clean all parts. Al-
ways use new solvent when cleaning
bearings. Oil the bearings immed-
iately to prevent rusting. Inspect
the parts for any major defects.
Clean the inside of
th~
housing be-
fore rebuilding and installing the
parts. Inspect individual parts as
outlined below.
GEARS
The pattern taken during disas-
sembly should help in judging if
gears can be reused. Worn gears
cannot be rebuilt to correct a noisy
FIG.
35-Separatlng
Differential Assembly
condition. Gear scoring is the result
of excessive shock loading or the
use
of
an
incorrect
lubricant.
Scored gears cannot be reused.
Examine the teeth and thrust sur-
faces
of
the
difl'erential
gears.
Wear on the hub of the difl'erential
wheel can cause a "chucking" noise
known as "chuckle" when the car
is driven at low speeds. Wear of
splines, thrust surfaces, or thrust
washers can contribute to excessive
drive line backlash.
BEARING CUPS
Check bearing
q~ps
for rings,
scores, galling, or erratic wear pat-
terns. Pinion bearing cups must be
solidly seated. Check by attempting
to insert a
0.0015
inch feeler be-
tween these cups and the bottom
of their bores.
CONE AND ROLLER
ASSEMBLIES
When operated in the cups, bear-
ing
rollers
must
turn
without
roughness. Examine the roller ends
for wear. Step-wear on the roller
ends indicates the bearings were
not preloaded properly or the rol-
lers were slightly misaligned.
DRIVE PINION FLANGE
Be sure that the ears of the
flange have not been damaged in
removing the drive shaft or in re-
moving the flange from the pinion.
The end of the flange that contacts
the bearing cone must be smooth.
Polish
this
face
if
necessary.
Roughness
aggravates
backlash
noises
and
causes wear of the
flange with a resultant loss in pin-
ion bearing preload.
CARRIER CASTING
Make sure that the difl'erential
bearing bores are smooth and the
bearing abutment faces are not
damaged.
DIFFERENTIAL CASE
Carefully examine the case hubs,
which
may
have been
damaged
when the bearings were removed.
The bearing assemblies will fail if
they·
do not seat firmly on the hubs.
Check the fit of the difl'erential
wheel hubs in the case.
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