Buick LeSabre 1965 Service Manual page 397

REAR AXLE, 46, 48, 49000 SERIES
6-31
Ring and pinion gear sets are
matched in a special test machine
which permits adjustment of pin-
ion depth in ring gear until a point
is reached where best operation
and proper tooth contact under
load is obtained. At this point, the
setting of the pinion with refer-
ence to the center line of the ring
gear is indicated by the machine.
This setting may vary slightly
from the design or "nominal"
setting due to allowable variation
in machining the parts. However,
most production pinions and all
pinions used for service replace-
ment are zero or nominal pinions.
If during repair, a pinion is found
having a plus or minus reading
recorded in thousandths on the
rear face of the pinion, this indi-
cates that the pinion during test-
ing 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 vari-
ables, a procedure of gauging the
carrier and shimming the pinion
has been developed. After gauging
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 ad-
justed to an exact required speci-
fication for best tooth contact in
each axle assembly.
Pinion Setting Gauge J-5647 with
Adapter J-5647-35, Adapter
J-5647-34, P i l o t J-5647-37,
Gauge Plate J-5647-36, and Stud
and Nut Assembly J-8619-13 is
used to set pinion depth. See
DIAL INDICATOR
KMO B-30
'if
GAUGE PLATE
J-5647-36
STUD
J-8619-13
PILOT
v
' W '
J-5647-37 ^
Fig. 6-65—Pinion Setting Gauge J-5647 and Adapters
Figure 6-65. It is not necessary
to reassemble and install the pin-
ion depth shim since the pinion
depth setting gauge arrangement
provides in effect, a nominal or
z e r o pinion as a gauging
reference.
b. Checking Pinion Depth
NOTE: B e f o r e setting pinion
depth, the pinion bearing races
must be in position and the pinion
oil seal must be removed. Install
races following instructions in
subparagraph c , Steps 1 and 27
1. Be certain that all parts in
pinion setting gauge are clean.
2. Install the disks on the indi-
cator gauge. Install the small
contact button on the stem of the
dial indicator and mount the dial
indicator on the indicator gauge.
3. Place the indicator gauge on
the master gauge so that the
spring-loaded center is engaged
in the centering hole correspond-
ing to the indicator pad "b". See
Figure 6-65.
4. Center the indicator contact
button on the specified contact
pad and lock the indicator by
tightening the thumb screw.
5. Hold gauge yoke down firmly
with both disks contacting the hor-
izontal and vertical pads on the
master gauge; set dial indicator
at zero.
6. Lubricate front and rear pin-
ion bearings which will be used
in final reassembly, and position
them in their respective races in
the carrier. With bearings held
in place in races, install a 50
thousandths shim and Gauge Plate
J-5647-36 on rear pinion bearing
inner race. Install Pilot J-5647-
37 on front pinion bearing with
small diameter raised portion in-
side bearing race. Insert Stud
J-8619-13 through pilot, and
thread it into the gauge plate.
See Figure 6-66.
NOTE: Fifty thousandths shim is
r e q u i r e d under Gauge Plate