Subaru 2002 IMPREZA Service Manual page 2004

DIFFERENTIALS
20) If proper tooth contact is not obtained, once
again adjust the drive pinion height and the differ-
ential side bearing preload (already mentioned)
and the hypoid gear backlash.
(1) Drive pinion height
ST1 498447150 DUMMY SHAFT
ST2 498505501 DIFFERENTIAL GAUGE
T = To + N − 0.05 (mm)
where
T = Thickness of pinion height adjusting shim
(mm)
To = Thickness of shim originally installed
(mm)
N = Reading of thickness gauge (mm)
(2) Differential side bearing preload
Screw in side (left-side) holder until light contact
is made with ST.
Back off the side (left-side) holder approx. 1 1/2
teeth of holder, and tighten the left-side holder
by approx. 2 teeth (approx. 1 1/2 + 1/2 teeth).
[Back off amount of side (left-side) holder + 1/2
tooth.]
This + 1/2 tooth gives preload.
ST 499785500 WRENCH
REAR DIFFERENTIAL FOR VA-TYPE
H3M1309B
G3M0064
DI-54
(3) Hypoid gear backlash
Backlash:
0.10 — 0.15 mm (0.0039 — 0.0059 in)
21) Install the rear cover and tighten the bolts to
specified torque.
Tightening torque:
25 N·m (2.5 kgf-m, 18.1 ft-lb)
(A) Rear cover
E: INSPECTION
Wash all the disassembled parts clean, and exam-
ine them for wear, damage, or other defects. Re-
pair or replace defective parts as necessary.
1) Crown gear and drive pinion
• If abnormal tooth contact is evident, find out the
cause and adjust to give correct tooth contact at as-
sembly. Replace the gear if excessively worn or in-
capable of adjustment.
• If crack, score, or seizure is evident, replace as a
set. Slight damage of tooth can be corrected by oil
stone or the like.
2) Side gear and pinion mate gear
• Replace if crack, score, or other defects are evi-
dent on tooth surface.
• Replace if thrust washer contacting surface is
worn or seized. Slight damage of the surface can
be corrected by oil stone or the like.
3) Bearing
Replace if seizure, peeling, wear, rust, dragging
during rotation, abnormal noise or other defect is
evident.
S3M0523
S3M0526A