Buick LeSabre 1965 Service Manual page 400

6-34
REAR AXLE, 46, 4 8 , 4 9 0 0 0 SERIES
Fig. 6-73—Tightening Pinion Nut
grease on seal surface of pinion
flange. Install pinion flange on
pinion by tapping with a soft ham-
mer until a few pinion threads
project through the flange. Install
pinion washer and nut. Hold pin-
ion flange with Holder J-8614-01.
(On 49000, hold pinion flange with
Holder J-8614-01 and Adapters
J-21619.) Torque pinion nut to
80 ft. lbs. using Torque Wrench
J-1313 on outer end of Hnadle
J-6246. (This amounts to an ac-
tual 250 ft. lbs. torque at nut.)
See (Figure 6-73.)
7. Rotate pinion three or four
times to seat bearings. Turn pin-
ion slowly with an inch pound
torque wrench; bearing preload
Fig. 6-74—Checking Pinion
Bearing Preload
Fig. 6-75—Installing Differential
Bearing Outer Race
including drag of new seal should
be 15 to 35 inch pounds. See Fig-
ure 6-74.
If preload torque is low, reduce
total pinion spacer thickness.001"
for each added 10 in. lbs. preload
needed; if preload is high, in-
crease total pinion spacer thick-
ness .001" for each 10 in. lbs.
preload to be subtracted. These
spacers are furnished to be used
in pairs so that possible thick-
nesses range from .400" to .470"
by thousandths. Service spacers
are marked with their thickness
in thousandths.
d. Assembly of Differential
Case, Gears and Bearings
1. Drive differential b e a r i n g
outer races into case, using Re-
placer J-9742. See Figure 6-75.
2. Install side gears, pinions, and
washers in case. If same parts
are used, replace in original
sides. Install pinion axle. Drive
Fig. 6-76—Installing Ring Gear
on Differential Case
spring pin through hole in pinion
axle until flush with case.
3. Check matching numbers on
ring gear and pinion to make sure
the two parts have not been mixed
with another gear set.
4. After making sure that mating
surfaces of case and ring gear
are clean and free of burrs, bolt
ring gear to case using three
Studs J-6251 to align parts. See
Figure 6-76. If same ring gear
and case are used, line up marks
so they are assembled in same
relative positions.
Do not use lock washers or any
substitute bolts.
5. First tighten bolts alternately
on opposite sides of the case to
35 ft. lbs. torque, then tighten in
the same manner to 70 ft. lbs.
e. Installation and Adjustment
of Ring and Case
Assembly
1. Before installation of ring
gear and case assembly make
sure that differential bearing and
bearing support surfaces in car-
rier pedestals are clean and free
of burrs. Remove any burrs which
might prevent bearings or bear-
ing s u p p o r t s from seating
properly.
2. Place case assembly and dif-
ferential bearings in position in
carrier. If same bearings are
used, install in original positions.
Insert Support Tools J-9743
through the pedestal bores into