Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 495
DI-25
Rear Differential (T-type)
DIFFERENTIALS
7) Tighten the self-locking nut.
Tightening torque:
70 N·m (7.1 kgf-m, 51.6 ft-lb)
8) Attach the ST to rear differential.
ST 28099PA090 OIL SEAL PROTECTOR
9) Insert the spline shaft until the spline portion
comes inside the side oil seal.
10) Remove ST from rear differential.
11) Push the housing to fully insert the DOJ into the
rear differential.
12) Lower the transmission jack.
13) Installing procedure hereafter is in the reverse
order of removal.
14) After installing, fill the differential carrier with
gear oil up to the bottom of the filler plug or the oil
temperature switch hole. <Ref. to DI-19, RE-
PLACEMENT, Differential Gear Oil.>
15) Inspect the wheel alignment and adjust if nec-
essary.
C: DISASSEMBLY
1. T-TYPE (B2)
To detect the real cause of trouble, inspect the fol-
lowing items before disassembling.
• Tooth contact and backlash between hypoid
driven gear and drive pinion
• Hypoid driven gear runout on its back surface
• Total preload of drive pinion
1) Set the ST on vise and install the differential as-
sembly to ST.
ST 398217700
ATTACHMENT SET
2) Remove the air breather cap.
NOTE:
• Do not attempt to remove the air breather cap
unless necessary.
• Whenever the air breather cap is removed, re-
place it with a new part.
3) Remove the bolts, and then remove the rear
cover.
DI-00602
DI-00279
ST
DI-00280
DI-00518
(A) Air breather cap
(B) Rear cover
DI-00061
ST
(A)
(B)
DI-00672
DI-26
Rear Differential (T-type)
DIFFERENTIALS
4) Remove the side retainer attachment bolts, set
the ST to differential case, and extract the side re-
tainers RH and LH with a puller.
NOTE:
• Side retainer shim of each side should be kept
together with its mating retainer.
• Keep the side retainers separate by attaching
tags or in similar ways to make it possible to identify
RH and LH sides during reassembly.
ST 398457700
ATTACHMENT
5) Pull out the differential case assembly from the
differential carrier.
NOTE:
Be careful not to hit the teeth of hypoid driven gear
against the differential carrier.
6) Remove the oil seal and O-ring from the side re-
tainer.
7) When replacing the bearing race, remove the
bearing cup from the side retainer using ST.
ST 398527700
PULLER ASSY
8) Using the ST, remove the bearing cone.
NOTE:
• Do not attempt to disassemble the parts unless
necessary.
• Set the puller so that its claws catch the edge of
the bearing cone.
• Never mix up the RH and LH bearing races and
cones.
ST 18759AA000 PULLER ASSY
9) Remove the hypoid driven gear by loosening hy-
poid driven gear bolts.
10) Remove the pinion shaft lock pin from driven
gear side using ST.
ST 899904100
STRAIGHT PIN REMOVER
DI-00064
ST
DI-00065
DI-00066
ST
DI-00316
ST
DI-00068
DI-00701
ST
DI-27
Rear Differential (T-type)
DIFFERENTIALS
11) Draw out the pinion mate shaft, and remove
pinion mate gears, pinion mate gear washers, side
gears, and side gear thrust washers.
NOTE:
The gears and washers should be marked or kept
separately right and left, and front and rear.
12) Remove the self-locking nut while securing the
companion flange with ST.
ST 498427200
FLANGE WRENCH
13) Extract the companion flange with a puller.
14) Press the end of drive pinion shaft by using the
ST, and remove the drive pinion shaft, rear bearing
cone, preload adjusting spacer and washer.
NOTE:
Hold the drive pinion so as not to drop it.
ST 398467700
DRIFT
15) Remove the rear bearing cone from drive pin-
ion while supporting the cone with ST.
NOTE:
Place the replacer so that its center-recessed side
faces the bearing cone.
ST 398517700
REPLACER
16) Remove the front oil seal from differential carri-
er using ST.
ST 398527700
PULLER ASSY
(A) Side gear
(B) Pinion mate gear
(C) Side gear thrust washer
(D) Differential case
(E) Pinion mate shaft
(F) Pinion mate gear washer
(A) Companion flange
(B) Puller
DI-00685
(E)
(D)
(F)
(F)
(B)
(A)
(C)
(A)
(C)
DI-00071
ST
DI-00142
(B)
(A)
(A) Differential carrier
(B) Front oil seal
DI-00073
ST
DI-00074
ST
DI-00145
(B)
(A)
DI-28
Rear Differential (T-type)
DIFFERENTIALS
17) Remove the pilot bearing together with the front
bearing cone and spacer using the ST.
ST 398467700
DRIFT
18) When replacing the bearings, hit out the front
bearing race and rear bearing race in this order us-
ing a brass bar.
2. T-TYPE (H3)
To detect the real cause of trouble, inspect the fol-
lowing items before disassembling.
• Tooth contact and backlash between hypoid
driven gear and drive pinion
• Hypoid driven gear runout on its back surface
• Total preload of drive pinion
1) Set the ST on vise and install the differential as-
sembly to ST.
ST 398217700
ATTACHMENT SET
2) Remove the drain plug and oil temperature
switch, and drain the gear oil.
NOTE:
Remove the oil temperature switch and adapter as
a unit.
3) Remove the air breather cap.
NOTE:
• Do not attempt to remove the air breather cap
unless necessary.
• Whenever the air breather cap is removed, re-
place it with a new part.
4) Remove the bolts, and then remove the rear
cover.
(A) Pilot bearing
(B) Spacer
(C) Front bearing
(D) Rear bearing race
(A) 2 cutout portions along diagonal lines
(B) Tap alternately with brass bar.
DI-00076
ST
(B)
(A)
(C)
(D)
DI-00077
(B)
(A)
(A) Air breather cap
(B) Rear cover
(C) Oil temperature switch
(D) Drain plug
DI-00061
ST
DI-00678
(A)
(D)
(C)
(B)
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