6. Use a drift to tap around the circumference of the
pinion gear bearing (
Figure 39
) and drive the race
from the its boss in the gearcase.
Installation
1. Place the new ring gear bearing and the new pin-
ion gear bearing outer race in a freezer overnight.
2. Heat the final gearcase to 150° C (302° F).
WARNING
The final gearcase is extremely hot.
Use welding gloves or other suitable
means to protect your hands.
3. Remove the gearcase from the oven and set it on
wooden blocks.
4. Remove the pinion gear bearing outer race from
the freezer and apply engine oil to the race.
5. Use a socket that matches the outside diameter
of the race to drive the pinion gear bearing outer
race (
Figure 39
) into its boss in the gearcase. Make
sure the race bottoms in the boss.
6. Install the new pinion gear bearing inner race on
the inboard end of the pinion gear.
7. Oil the ring gear collar and the boss in the final
gearcase.
8. Support the gearcase housing in a hydraulic
press.
9. Use a tool that matches the outside diameter of
the collar to press the collar into place in the
gearcase. Make sure the collar bottoms in the boss.
10. Pack the lips of a new oil seal with lithium soap
grease, and press the oil seal over the collar and into
the housing. The closed side of the oil seal should
face down toward the lip of the collar.
11. Lubricate a new ring gear bearing, and press it
over the collar and into the housing. Refer to the
typical bearing procedures in Chapter One.
Pinion Gear/Ring Gear Alignment
The pinion gear and ring gear must be aligned
whenever the final gearcase or any bearing is re-
placed. To align the pinion and rings gears, select
and install new pinion gear shim(s) and new ring
gear shim(s). See
Figure 28
.
1. Calculate the thickness of each shim as de-
scribed in
Pinion Gear Shim Selection
and
Ring
Gear Shim Selection
.
2. Refer to the chart (
Figure 33
) and select the
shim(s) with the calculated thickness.
3. Assemble the final gearcase with these new
shims.
Pinion Gear Shim Selection
Calculate the pinion gear shim thickness using
the following formula:
Pinion gear shim thickness = (84 + A/100) – B.
A = the number on the pinion gear (
Figure 40
).
B = the number on the final gearcase (A,
Figure
41
).
For example: If the pinion gear number is +01
and the gearcase number is 83.50, then the pinion
gear shim thickness:
= (84 + 1/100) – (83.50)
= (84 + 0.01) – (83.50)
= 84.01 – 83.50
= 0.51
Since shims are only available in increments of
tenths of a millimeter, round off the hundredths
digit according to the chart in
Figure 42
.
In the above example, round the calculated value
of 0.51 mm down to 0.50 mm. Refer to the chart in
Figure 33
for available pinion gear shims and select
a shim that is 0.50 mm thick.
REAR SUSPENSION AND FINAL DRIVE
345
12
42
Hundredths digit
Rounded-off value
0, 1, 2, 3, 4
Round down to zero
5, 6, 7, 8, 9
Round up to the next tenth (10) digit.
CALCULATED SHIM VALUE ROUNDED OFF
