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5-18
REPAIRS
REAR AXLE ASSEMBLY
(188)
rear axle and third
memo er
housings are abso-
lutely clean and
dry.
Also make certain that
parts to be installed are clean and that pinion
bearing
shims are
not damaged.
1. If
the original third member housing and
pinion shaft are being used, place the original
number and thicknesses of pinion bearing
shims over propeller shaft against front bear-
ing, to maintain original setting of pinion.
2.
If
a new pinion is being installed, change
the total thickness of shims by the difference
between the old pinion and new pinion setting
marks as explained in paragraph 5-19 below.
For example: if old pinion is marked "
+3"
(plus 3) and new pinion is marked "-2"
(minus 2), total thickness of shims installed
should be .005" greater than shims removed.
NOTE:
Shims
furnish
ed
with new gear sets
are for use
as
required in adjw,;tment and are
not necessarily of corre
ct
total thickness.
3. Lubricate both pinion bearings thoroughly
with rear axle lubricant which should also be
used to hold shims against front bearing.
4. As pinion and propeller shaft assembly is
inserted into third member housing, turn pin-
ion front bearing outer race so that the ball
loading groove will be straight up, to prevent
oil running through into torque tube. Also, turn
propeller shaft to engage splined front end in
splines of universal joint.
LSPACER
J-l l 92
B- -,
Figure 5-22-Use of Pinion Bearing Spacer J 1192-B
5. As the pinion rear bearing enters third
member housing, place Pinion Bearing Spacer
J 1192-B,
(1
4"
thick) between bearing and
pinion gear so that bearing can be pushed into
place without binding against spacer on pinion
shaft. See figure 5-22.
6. Lightly tap the pinion forward with a
brass drift until the holes in pinion bearing
lock sleeve align with tapped holes in carrier,
then install the three sleeve lock screws.
Tighten each lock screw a little at
a
time until
lock sleeve and pinion front bearing are solidly
seated and screws are uniformly tightened to
35-40 ft. lbs. torque. Tighten lock nuts to 15-20
ft. lbs
.
torque; excessive tightening of nuts
may withdraw lock screws sufficiently to allow
end play of pinion bearing. Remove Spacer
J 1192-B.
7. Regardless of whether original or new
parts affecting pinion setting are installed,
check pinion setting with gauge as described in
the following paragraphs (5-19, 5-20, 5-21).
Figure 5-23-Ring and
Pin ion
Gear Markings
5-19 INSTALLATION MARKS ON
MATCHED RING AND PINION
GEAR SETS
All Buick ring and pinion gear sets are
selectively matched for quiet operation and
proper
tooth contact. After matching, a serial
number is etched on one tooth of pinion and
on rear face of gear to aid in keeping matched
parts together. See figure 5-23. Parts having
different matching serial
numbers must n
ever
be used together.
Ri
ng and pinion
gear sets are matched
in a
special t
est machine
which permits adjustment
of pinion depth in ring gear until a point is
reached
where quiet operation and proper tooth
contact under load is obtained. At this point,
the setting of pinion with
reference
to center-
line of ring gear is indicated by the machine.
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