Installing Two Service Shims; Installing Service Spacer; Inserting Feeler Gauge - Pontiac Grand Prix Service Manual

4A-24
1969 PONTIAC SERVICE MANUAL
NOTE: Whenever a case assembly is removed from the
housing, measure the production s h i m for thickness and
discard them (Fig. 4A -44).
This figure will be used to determine the approximate
shim pack neefied in step 4 (below). Use standard
.170" service spacers and steel service shims (available
from .040" to .082", in increments of .002") for all
service repairs.
NOTE: Do not attempt to reinstall the production shim
as they may break when tapped into place. If service
shims were previously installed, they can be reused, but
(whether using new or .old bearings) adhere to the
following procedure in all cases:
To adjust differential side bearing preload, change the
thickness of the right and left shims equally, thus
leaving the original backlash undisturbed.
1. Before installation of case assembly, make sure side
bearing surfaces are clean and free of burrs. Lubricate
side bearings with gear lube. If reusing original
bearings, the original outer races must also be used.
2. Place differential case, with bearing outer races in
position, in carrier.
3. Slip one .170" service spacer between each bearing
race and camer housing, with flat edge against
housing (Fig. 4A-45).
NOTE: As a safety precaution, install the left bearing
cap loosely so that the case may be moved while
checking adjustments (one 7 16"-14 x 4 1/2" bolt can
be added as an extra safety precaution in the lower right
bearing cap hole). This will prevent the case j?om
dropping while making shim adjustments.
Fig. 4A-46 Installing Two Service Shims
4. Subtract .365" (total of two .170" service Spacers
plus .025" gauging space) from total shim pack
removed on disassembly. Select two shims totaling this
amount and position both between 'light bearing race
and service spacer. Be sure left bearing race and spacer
are against left housing of carrier (Fig. 4A-46).
5. Insert a feeler gauge of less than .loo" between right
shim and senice spacer (Fig. 4A-47).
NOTE: It will be necessary to work the case in and out
and to the left in order to insert the gauge. The gauge
must be inserted in order to judge the drag. Be sure to
locate the gauge at the centerline of the bearing.
Fig. 4A-45 Installing Service Spacer
Fig. 4A-47 Inserting Feeler Gauge