Installation And A D Ju Stm En T - GMC 1982 Light Duty Truck Service Manual

Fig. 4Bl-35--Measuring Rotating Torque
6. Place the arbor and plunger assembly into the carrier,
being sure the side bearing discs are seated properly.
7. Install the bearing caps finger tight to hold the discs
from movement.
8. Position dial indicator J-8001 on the mounting post of
the arbor with the contact button resting on the top
surface of the plunger.
9. Preload the dial indicator one-h alf revolution, and
tighten in this position.
10. Select the button on the gage plate or gage block that
corresponds to the ring gear size and rotate the plate
until the plunger rests directly upon that button.
11. Rock the plunger rod slowly back and forth across the
bu tton until the dial indicator reads the g reatest
deflection. A t this point, set the dial indicator to zero.
Tools will now be positioned as shown in figure 4B1-36.
It is important to use a dial indicator correctly when
determ in in g pinion dep th requirem ents. Be sure to
record the number indicated by the indicator needle; do
not record the amount of travel of the needle.
A fter "zeroing" the dial indicator on the highest point
of deflection on the gauge plate, the indicator probe is
swung off the gauge plate, allowing the needle to move.
The number which the needle points toward is the
correct shim thickness required for a nominal pinion.
See figure 4B1-37.
12. Repeat the rocking action of the plunger several times
to verify the setting.
13. Once the zero reading is obtained, swing the plunger
until it is removed from the gaging plate button.
T he dial indicator will now read the required pinion
shim thickness for a "nom inal" pinion. Record this
figure.
14. Check the rear face of the drive pinion being installed
for a pinion code number. This num ber indicates the
necessary alteration of the pinion shim thickness as
determined in step 13.
a. If the pinion is stamped with a plus ( + ) number,
that many thousandths to the indicator reading. For
example, if indicator reading is .019, and pinion is
marked ( + 2), the correct depth shim for installation
will be .019 + .002 = .021 inch.
b. If the pinion has no plus ( + ) or minus (-), use the
indicator reading as the correct shim thickness.
c. If the pinion is stamped with a minus (-) number,
that many thousandths from the indicator
subtract
reading. For example, if the indicator reading is .031,
and pinion is marked (-3), the correct depth shim for
installation will be .031 - .003 = .028 inch.
15. Remove bearing caps and depth gaging tools from
carrier.
16. Position the shim selected in step 14 on the pinion shaft
against pinion head.
17. Lubricate the rear pinion bearing with liberal amounts
of hypoid lub ric a nt and install rear bearing. Use
J-8609-01 for the 8 -1 /2 " ring gear or J-5590 for the
8-7/8" ring gear or J-6547 for the 9 1/2" ring gear, as
shown in figure 4B1-38.
In s ta lla tio n a n d A d ju s tm e n t
1. Lubricate the front bearing with liberal amounts of
hypoid lubricant, and place into outer cup.
2. For 8-7/8" ring gear position seal in bore and place
gage plate J-22804-2 over seal and against flange. Gage
plate insures proper seating of seal in carrier bore. See
figure 4 B 1 -39. Use J - 2 3 9 11 to press seal into bore until
gage plate is flush with the carrier shoulder and seal
flange. T urn gage plate 180°; seal must be square in
carrier to seal propberly.
For 8-1 /2 " ring gear place a new seal into position in
carrier bore. T ap lightly with a protective plate and a
ham mer until seal flange seats against carrier.
For 9 -1 /2 " ring gear use tool J-22388 pinion seal
installer.
REAR A X L E 4 B 1 - 1 3
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