Differential Bearing Preload Adjustment - Jeep 1979 CJ-5 Technical & Service Manual

AXLES 2F-29
Fig. 2F-40 Differential Bearing installation
4 1 4 4 3
Fig. 2F-41 Adjusting Differential Bearing Sideplay
(2) Install bearing cap bolts and tighten bolts to 87
foot-pounds (118 N«m) torque.
(3) Attach dial indicator to housing. Position in-
dicator so indicator stylus contacts drive side of a ring
gear tooth and at right angle to tooth (fig. 2F-43).
(4) Move ring gear back and forth and note move-
ment registered on dial indicator. Ring gear backlash
should be 0.005 to 0.009 inch (0.12 to 0.22 mm), with
0.008 inch (0.20 mm) desired.
J-8001 41444
Fig. 2F-42 Checking Ring Gear Surface of Case for Runout
(5) Adjust backlash as follows: to increase backlash,
install thinner shim on ring gear side and thicker shim
on opposite side. To decrease backlash, reverse pro-
cedure, however, do not change total thickness of shims.
E x a m p l e : Sideplay was removed using 0.090-inch (2.28
mm) shims on each side totaling 0.180 inch (4.57 mm).
Backlash is checked and found to be 0.011 inch (0.27
mm). To correct backlash, add 0.004 inch (0.10 mm) to
shim on ring gear side and subtract 0.004 inch (0.10 mm)
from shim on opposite side.
This will result in 0.094-inch (2.38 mm) shim on ring
gear side and 0.086-inch (2.18 mm) shim on other side.
Backlash will be approximately 0.007 to 0.008 inch (0.17
to 0.20 mm). Total shim thickness remains 0.180 inch
(4.57 mm).
Differential Bearing Preload Adjustment
N O T E : Differential bearings must be preloaded to
compensate for heat and loads during operation. Correct
preload is 0.008 inch (0.20 mm). The differential bear-
ings are preloaded by increasing the shim pack thickness
at each side of the differential by 0.001+ inch (0.10 mm).
(1) Remove differential assembly from housing. Be
sure to keep differential bearing shim packs together for
proper assembly.
(2) Reinstall differential bearing shims in axle
housing bearing bores.
(3) Install differential bearing cups on differential
bearings. Cups should cover differential bearing rollers
completely.