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3-12
REAR
AXLE
Fig. 31-finion
Oil Seal Installed
both directions to align the bearing rollers. Retest
torque to 240 foot-pounds (torque may have dimin-
ished as bearing rollers were aligned by rotating).
Pinion Bearing Preload und Pinion Setting
using Tool
C-758-D3
(On Models using
7 %
inch diumeter pinion stem).
Inspect the bearing cups and carrier for gift and
dirt. Assemble spacer SP-2921 to the main section
of
the tool followed by spacer SP-1730. Install the pinion
rear bearing over spacer SP-1730 and against spacer
SP-2921 (Fig. 32). Insert the assembly into the car-
rier
housing and install the front bearing over the
tool shaft and in its proper position in the bearing
cup. Install the tool spacer; tool thrust washer and
the tool nut on the shaft. Tighten the tool setting nut
to not more than 25 to 50 foot-pounds torque.
Turn the tool several revolutions to permit the
bearing rollers to seat. After the bearing rollers have
been properly seated, check the bearing preload by
rotating the tool with an inch-pound torque wrench.
With the bearings lubricated with hypoid gear oil the
correct preload should be from 25 to 50 inch-pounds
torque.
Assemble gauge block SP-528 or SP-3250 to the
main screw attaching it with the Allen screw securely.
Position tool arbor SP-561 in the differential carrier
bearing supports. Insert a piece of .002 inch feeler
stock between the arbor and each cap. Install the
caps and tighten the bolts to 10 foot-pounds torque.
Select a gauge washer that will just pass between
the gauge block end of the tool and the machined
surface of the bearing arbor. As an example, if a .090
inch spacer can be inserted but a .092 inch spacer
cannot be forced between the two surfaces by hand,
the .090 inch spacer should be used even though
it
might feel loose.
Note the end of the drive pinion as it will indicate
the amount that should be added or subtracted from
the spacer that was selected. As an example, if the
pinion shaft indicated plus +2 a .002 inch thinner
spacer should be used for final assembly. As an exam-
ple, if a spacer selected by the use of the tool is
.090
inch it is necessary to deduct .002 inch, therefore,
the correct spacer for final assembly would be .088
inch.
To correctly read the markings on the end of the
drive pinion, always remember that the plus
(+)
sym-
bol indicates a deduction of the required spacer thick-
ness, whereas the minus
(-)
symbol indicates the ne-
cessity for a thicker spacer.
When the correct spacer is selected for the drive
pinion, disassemble the setting tool from the differ-
ential carrier housing and add the pinion positioning
spacer just selected to the tool, between spacer SP-
2921 and the pinion rear bearing. Install spacer SP-
1730 and the
pinion bearing adjusting spacer
from
the previous bearings. Insert the tool assembly in the
carrier housing. Place the forward roller bearing over
the shaft and in position in the carrier bearing cup.
Install the tool spacer, tool nut washer and tool nut
on the shaft. Hold the compression sleeve nut with
PINION LOCATING WASHER
NY168A
Fig. 32-rool
C-758 Installed in Housing (All Models using 3 8 3 and 413 Cubic Inch Engines
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