Differential Bearing Preload And Ring Gear Backlash Adjustment - Lincoln Continental 1964 Shop Manual

4-18
.038w SHIM
-~~
PACK
GROUP 4-REAR AXLE
CLEARANCE .032"
+
PRELOAD .015"
E1243-B
FIG.
40-Differential Bearing Preload and Ring Gear Backlash Adiustment
the clearance and establish preload
and backlash:
(a) Place the dummy bearings
(tool 4205-C) on the differential
hubs, and again install the differ-
ential assembly in the housing (this
time with the pinion installed). In-
stall the bearing caps in their proper
positions. Install and tighten the re-
taining bolts finger tight. Install the
dial indicator with the contact point
against the back face of the ring
gear as shown in Fig. 30. Move
the differential and ring gear as-
sembly tight against the pinion
gear, and then set the dial indicator
to zero. Move the differential and
ring gear assembly away from the
pinion as far as possible, and note
the reading.
(b)
This reading indicates the
amount of shims necessary to take
up the clearance between the bear-
ing cup and the case at the ring
gear side of the differential as-
sembly. Subtract this reading from
the previously recorded total read-
ing to obtain the amount of shims
necessary to take up the clearance
between the bearing cup and the
case at the pinion side of the dif-
ferential. Increase this pinion side
shim pack by an additional 0.015
inch in order to provide correct bear-
ing preload and backlash.
EXAMPLE (Fig. 40):
Total Clearance
previously recorded ... 0.070 inch
Less reading in foregoing
step (a)
(Amount of shims
necessary to take
up clearance at ring
gear side) ........ 0.038 inch
Shims necessary to take
up clearance at
pinion side . . ........ 0.032 inch
Plus 0.015 inch shims for
preload and backlash .. 0.015 inch
Total amount of
shims at
pinion side ........ 0.047 inch
(074)
16.
Remove the dial indicator,
bearing caps and differential case
from the housing. Remove the
dummy bearings from the differ-
ential case.
17. Install the required number
of shims on the bearing case. Using
tool 4222-H, press the side bearings
on the case.
18. Attach the spreader tool to
the housing, as shown in Fig.
16, making certain the dowels
on the tool enter the openings
in the housing. Spread the housing
enough to permit installation of the
differential case and bearing as-
sembly. Do not spread the housing
more than 0.020 inch.
19. Install the bearing · caps in
their respective positions as indi-
cated by the markings on the caps
and housing (Fig. 15). Remove the
spreader. Place some sealing com-
pound on the bearing cap bolts.
Install and torque the bolts to
specifications.
20. With the dial indicator at-
tached to the housing, as shown in
Fig. 4, Part 4-1, check the backlash
between the ring gear and pinion at
four equally spaced points around
the ring gear.
The backlash should not be less
than 0.003 inch or exceed 0.008
inch, and must not vary more than
0.002 inch between the positions
checked.
21. Attach a dial indicator to the
differential housing as shown in
Fig.
5, Part 4-1. With the indicator
set at "zero", revolve the ring gear
at least one revolution and check
the total ring gear runout. The total
indicator reading, or runout, should
not exceed 0.006 inch.
22. Make a final tooth contact
pattern check.
23. Install the gasket and differ-
ential cover with the gear identifi-
cation
ta~
beneath one of the cover
bolts. Torque the bolts to specifi-
cations.
24. Refill the axle with specified
lubricant.