Securing Gauge Plate In Carrier; Installing Front Pinion Bearing Outer Race - Pontiac Grand Prix Service Manual

STANDARD DIFFERENTIAL 4A-21
Fig.
4A-37
Installing Front Pinion Bearing Outer
Race
ensure proper seating. Check to be sure gauge plate is
centered over bearing (Fig. 4A-39), then torque nut to
obtain a bearing preload reading of 20 in. lbs.
(obtained with gauge plate assembly rotation). It may
be necessary to hold stud stationary with a wrench on
flats at end of stud.
Tempest, Firebird, or Grand Prix - Thread nut on J
8619-13 bolt to end of thread. Thread J 8619-13 bolt
into J 21777-2 gauge plate so plate rests against nut.
Insert assembled gauge plate and bolt into carrier
through front and rear bearings with underside of
plate against rear bearing (Fig. 4A-38). Slip J 8619-12
pilot over bolt end with underside against front
bearing. Tighten another nut fingertight while rotating
gauge plate to ensure proper seating. Check to be sure
gauge plate is centered over bearing (Fig. 4A-39), then
torque nut to obtain a bearing preload reading of 20
in. lbs. (obtained with gauge plate assembly rotating).
It may be necessary to hold stud stationary with .a
wrench on flats at end of stud.
4. Install a stem on the J 8001 dial indicator and
mount loosely on cross shaft. Position stem of indicator
on head of gauge pin so that stem is slightly depressed
(causing a low indicator reading). Tighten thumb
screw on indicator and set at zero.
5. Make certain bearing support bores are free of burrs
and dirt. Place discs J 2 1777-3-P, J 8619-10-T, F, or
G.P. cross shaft assembly. Position assembly in the
carrier with the discs resting on the bearing support
bores and gauge pin facing in toward guage plate.
Rotate discs to insure firm seating.
6. Position gauge plate so that, as cross shaft is rotated
(pressing firmly), the arc of the spherical end of gauge
pin scribes across the "B"-P, "A"-T, F, or G.P. surface
of the gauge plate (Fig. 4A-40).
7. Record maximum reading of dial indicator through-
out arc. When indicator scale is less than .loo", be sure
to note if indicator completes more than one revolu-
tion.
8. Subtract recorded reading from .loo". This figure
will be used to select correct%him in step 10.
NOTE: The pinion depth setting tool is designed to that
a perfect dial indicator reading of .IOU' would require
no shim. This is why the reading obtained must be
subtractedpom .IOU'.
9. Examine ring gear and pinion for nicks,*burrs or
scoring. Any of these conditions will require replace-
ment of gear set.
GAUGE PLATE
Fig.
4A-38
Securing Gauge Plate in Carrier