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46-1 6
1 9 7 7 PONTIAC SERVICE MANUAL
Fig. 48-31 Installing Front Pinion Bearing Outer Race
If during repair, a pinion is found having a plus or minus
reading recorded in thousands on the pinion, this indicates
that the pinion during testing was found to have best tooth
contact at a position varying from design or nominal depth.
In order to compensate for all of the allowable
machining variables, a procedure of gaging the carrier and
shimming the pinion has been developed. After gaging a
carrier, the assembler is able to install a shim between the
front face of the pinion and its bearing so that pinion depth
can be adjusted to an exact required specification for best
tooth contact in each axle assembly.
Set up pinion setting gage as follows:
1. Make certain all gage parts are clean. Check
particularly the discs, gage pin ends, dial indicator tip and
gage plate surface.
2. Lubricate front and rear pinion bearings which will
be used in final reassembly and position them in their
respective races in the carrier. Bearings used with gage set
must be those to be installed in vehicle, in order to insure
accurate reading.
3. Assemble pinion setting gage assembly into 'carrier
housing as follows:
Step 1
a. For 8 1/2" or 8 3/4" ring gear axles, install Pinion
Bearing Pre-Load Stud J 8619-13 through Pilot J 21777-35
and into Gage Plate J 2 1777-26.
For 7 1/2" ring gear axles, install Pinion Bearing Pre-
Load Stud J 21777-43 through Pilot J 23597-12 and intoGage
Plate J 23597-1 1.
For 6 1/2" ring gear axles, install Pinion Bearing Pre-
Load Stud J 2 1777-43 through Pilot J 23597- 13 and into Gage
Plate J 23597-1 1.
b. Install stud and plate assembly into housing (shown
in Fig. 4B-32) and install Front Pinion Bearing Pilot J 8619-
12 (or J 21777-42) and hex nut over end of stud, tightening
nut until snug and rotate gage plate to make sure that both
pinion bearings are properly seated.
c. Hold end of stud with wrench on its flats and tighten
hex nut until 20 lb. in. torque is required to keep gage plate
in rotation.
REAR PINION
5-8619-12 OR
5-23597-1 2 OR
5-23597-1 3
FRONT PINION
/
5:8619-13 OR
HEX NUT
5-2 1 777-43
21 58
Fig. 48-32 Pinion Gage Tools
-
Step 1
Step 2
a. For
8
1/2" or 8 3/4" ring gear axles, install Side
Bearing Discs J 8619-10 onto ends of Arbor Plunger
Assembly J 21777-1.
For
7
1/2" ring gear axles, install Side Bearing Discs J
21777-45 onto ends of Arbor Plunger Assembly J 23597-1.
For 6 1/2" ring gear axles, install Side Bearing Discs J
23597-4 onto ends of Arbor Plunger Assembly J 23597-1.
b. Make certain that carrier housing side bearing bores
are clean, free of burrs and position arbor into housing so that
discs are properly seated in bores and dial indicator plunger
rod is centered over "gaging area" of gage plate (shown in
Fig. 4B-33).
c. Install side bearing caps over discs and torque bolts
to 70 lb. ft.
4. Set dial indicator at ZERO. Then, position indicator
on mounting post of the arbor with the contact button
touching the plunger pad. Push dial indicator downward until
the needle rotates approximately 3/4 turn clockwise. Tighten
the dial indicator in this position and recheck.
5. Rotate arbor slowly back and forth until the dial
indicator reads the greatest deflection. At the point of greatest
deflection, set the dial indicator to ZERO. Repeat rock action
of gage shaft to verify the ZERO setting.
6 . After the ZERO setting is obtained, arbor until the
plunger rod does not touch the gage plate. Dial indicator now
reads the pinion depth directly.
7. Record dial reading at pointer (off gage plate)
position. EXAMPLE: If pointer moved counterclockwise
.067" to a dial reading of .OM", this indicates a shim thickness
of .033".
8. Select correct pinion shim to be used during pinion
reassembly on the following basis:
NOTE: All pinions will be marked in one of three places.
See Fig. 4B-34 for areas of pinion depth setting marking.
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