Pontiac tempest 1968 Service Manual page 154

SAFE-T-TRACK DIFFERENTIAL
4B-5
5. Inspect fit of inner races on case hubs by pry­
ing against shoulders at puller recesses. Bearing
inner races must be tight on case hubs.
NOTE: If either bearing is loose on case, entire
cast must be replaced.
6. If bearing inspection indicates that bearings
should be replaced, remove side bearings by using
side bearing puller J 8107 (two pinion) or J 22888
(four pinion) and adapter J 8107-2 (Fig. 4B-4).
CAUTION: Make certain that ends of puller arms
are fully against inner race of bearing.
7. Turn differential case in vise and remove other
side bearing in same manner.
8. If removing ring gear, clamp case In vise so
jaws are 90° to pinion shaft holes and remove ten
ring gear retaining bolts.
9. Partially install two bolts on opposite sides
of ring gear.
10. Remove ring gear from case by alternately
tapping on bolts.
CA UTION: Do not pry between case and ring gear.
11. Scribe mark or paint differential case halves
(Fig. 4B-7) to aid in alignment of c a s e when
assembling.
12. Remove differential case half attaching bolts.
13. Lift cap half of case from flange half. Remove
clutch cone, side gear, spring block, preload springs
and shims, if provided.
NOTE: Shims are used in some units between the
side gear and cone to maintain proper backlash
/ ^ ^ a i
ALIGNMENT
MARKS
F i g . 4 B - 7 Alignment Marks - Tempest and Firebird
between pinion gears and side gears. Keep these
parts with cap half of case assembly.
14. Remove corresponding parts from flange half
of case and keep t h e m with flange half of case
assembly.
CLEANING AND INSPECTION OF CASE
P O N T I A C -
1. Thoroughly clean differential case and inspect,
paying particular attention to ring gear mounting
flange, ring gear pilot and side bearing hubs.
2. Remove nicks and burrs with mill file.
NOTE: If using new case, thoroughly clean case
in suitable solvent, making certain bolt holes and
bolts are clean of steel filing and foreign material.
3. Clean side gears, pinion gears and thrust
washers with suitable solvent and inspect for ex­
cessive wear.
4. Clean side bearings thoroughly in clean solvent
(do not use a brush). Examine bearings visually and
by feel. Bearings should feel smooth when oiled and
rotated, while applying as much hand pressure as
possible.
NOTE: Minute scratches and pits that appear on
rollers and races at low mileage are due to the
initial preload. Bearings having these marks
should not be rejected.
5. Thoroughly clean ring gear and inspect back
side for any adhering material which may cause
runout.
6. Examine ring gear and drive pinion teeth for
nicks, burrs or scoring. Any of these conditions will
require replacement of gear set.
7. Position ring gear on case and check fit of
gear on flange and pilot. It should be .002" tight to
.001" loose. If ring gear easily falls into position,
it must be replaced.
NOTE: If ring gear is replaced, pinion gear must
also be replaced as they are only serviced in
matched sets.
8. Check press fit of side bearing inner race on
differential case. Side bearings must be a tight
press fit on hub.
9. Inspect clutch plates for scored, worn, cracked
or a distorted condition. If any of these conditions
exist, new clutch plates must be installed.
10. Replace parts as necessary and coat with clean
engine oil before installing in case.