Pontiac tempest 1968 Service Manual page 143

4A-20 1968 P O N T I A C SERVICE M A N U A L
c. If using production or service pinion which
has no marking, the correct shim will have a
thickness equal to the gauge reading found in
step 8.
11. Loosen stud J 8619-13 and remove gauge plate
J 21777-2, washer J 21777-8 (Pontiac only), pilot
J 8619-12 and both bearings from case.
12. Slide pinion shim onto pinion shaft and in­
stall rear pinion bearing on pinion, using installer
J 6547-P, J 21022-T or F and holder J 6407-1 and
2 in a press, as shown in Fig. 4A-38.
I N S T A L L PINION ASSEMBLY AND
ADJUST PINION PRELOAD
1. Position pinion assembly in carrier and install
new collapsible spacer.
NOTE: Tap rear of pinion assembly with soft
hammer to assure seating of rear pinion bearing
to its outer race in carrier.
2. Place front pinion bearing in position on pinion.
Hold pinion fully forward and drive bearing over
pinion until seated, using installer J 21285-01.
3. Coat O.D. of pinion oil seal with sealing
compound and install in carrier, using installer
J 21285-01 (Fig. 4A-9).
4. Coat lips of pinion oil seal and seal surface of
companion flange with gear lube. Install companion
flange on pinion, by tapping with a soft hammer until
a few pinion threads project through flange.
5. Install pinion washer and nut. Hold companion
flange with holder J 8614-1. While intermittently
rotating pinion to seat bearings, tighten pinion nut
until end play begins to be taken up.
Fig. 4A-37 Pinion Shim
CA UTION: When no further end play can be de­
termined, and holder J 8614-1 will no longer pivot
freely as pinion is rotated, preload is being ap­
plied. Further tightening should be done only after
preload has been checked.
6. Check preload by using a lb. in. torque wrench
(Fig. 4A-39).
CA UTION: After preload has been checked, final
tightening should be done very cautiously. Tighten
the pinion nut further, only a little at a time, and
check preload after each slight amount of tighten­
ing. Exceeding preload specifications will com­
press the collapsible spacer too far and require
its replacement. Backing off nut to correct ex­
cessive preload will unload the front bearing and
pinion nut, allowing bearing to turn on shaft.
mm
j 6547 PONTIAC ONLY
J 21022 TEMPEST AND
FIREBIRD
J 6407-1 & 2
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F i g . 4 A - 3 8 Installing Rear Pinion Bearing