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Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual - part 496

DI-29

Rear Differential (T-type)

DIFFERENTIALS

5) 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

6) 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.

7) Remove the oil seal and O-ring from the side re-

tainer.

8) When replacing the side bearing, remove the

bearing race from the side retainer using ST.

ST 398527700

PULLER ASSY

9) 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

10) Remove the hypoid driven gear by loosening

hypoid driven gear bolts.
NOTE:

Do not disassemble the differential case assembly.

11) Remove the self-locking nut while securing the

companion flange with ST.

ST 18633AA000 WRENCH COMPL

DI-00064

DI-00065

DI-00066

DI-00316

DI-00068

DI-00071

DI-30

Rear Differential (T-type)

DIFFERENTIALS

12) Extract the companion flange with a puller.

13) 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

14) Remove the rear bearing cone from drive pin-

ion by supporting the cone with ST.
NOTE:

Place the replacer so that its center-recessed side

faces the bearing cone.

ST 398517700

REPLACER

15) Remove the front oil seal from differential carri-

er using ST.

ST 398527700

PULLER ASSY

16) Remove the pilot bearing together with the front

bearing cone and spacer using the ST.

ST 398467700

DRIFT

17) When replacing the bearings, use a brass bar

to tap out the front bearing race and rear bearing

race in this order to remove them.

(A) Companion flange
(B) Puller

DI-00142

(B)

(A)

DI-00073

DI-00074

(A) Differential carrier
(B) Front oil seal

(A) Pilot bearing
(B) Spacer

(A) 2 cutout portions along diagonal lines
(B) Tap alternately with brass bar.

DI-00145

(B)

(A)

DI-00076

(B)

(A)

(C)

(D)

DI-00077

(B)

(A)

DI-31

Rear Differential (T-type)

DIFFERENTIALS

D: ASSEMBLY

1. T-TYPE (B2)

NOTE:

• Assemble in the reverse order of disassembly.

• Check and adjust each part during assembly.

• Keep the shims and washers in order, so that

they are not improperly installed.

• Thoroughly clean the surfaces on which the

shims, washers and bearings are to be installed.

• Apply gear oil when installing the bearings and

thrust washers.

• Be careful not to mix up the RH and LH bearing

races.

• Use a new O-ring and gasket.

• Replace the oil seal with a new part at every dis-

assembly.

• Be careful not to mix up the oil seal RH and LH.

• Apply differential gear oil to the lips when install-

ing the oil seal.

1) Adjusting preload for front and rear bearings
NOTE:

Adjust the bearing preload between front and rear

bearings with spacer and washer. Pinion height ad-

justing washer is not affected by this adjustment.

The adjustment must not be carried out with oil seal

inserted.

(1) Install the rear bearing race into the differen-

tial carrier using ST1 and ST2.

ST1 398477701

HANDLE

ST2 398477703

DRIFT 2

(2) Install the front bearing race to the differen-

tial carrier using ST1 and ST2.

ST1 398477701

HANDLE

ST2 398477702

DRIFT

(3) Insert the ST1 (DUMMY SHAFT) into carrier

with the pinion height adjusting washer and rear

bearing cone fitted onto it.

NOTE:

If tooth contact (drive pinion, hypoid driven gear) is

normal in the inspection before disassembling, ver-

ify that the washer is not deformed, and then re-use

the used washer.

(4) Install the preload adjusting spacer and

washer, front bearing cone, ST2, companion

flange and self-locking nut.

NOTE:

Use new front bearing cone.

ST1 398507702

DUMMY SHAFT

ST2 398507703

DUMMY COLLAR

DI-00697

DI-00079

ST2

ST1

(A) Pinion height adjusting washer
(B) Preload adjusting spacer

DI-00080

(B)

(A)

(C)

ST2

ST1

DI-32

Rear Differential (T-type)

DIFFERENTIALS

(5) Turn the ST1 by hand to smooth the bear-

ing, and tighten the self-locking nut while mea-

suring the initial load or initial torque with a

spring scale or torque wrench. Select the pre-

load adjusting washer and spacer so that the

specified preload is obtained when nut is tight-

ened to the specified torque.

NOTE:

• Use a new self-locking nut.

• Measure the preload in direction of tangent to the

flange.

• Be careful not to give excessive preload.

• When tightening the self-locking nut, lock ST1

with ST2 as shown in the figure.

ST1 398507702

DUMMY SHAFT

ST2 398507704

BLOCK

Tightening torque:

181.5 N·m (18.5 kgf-m, 133.9 ft-lb)

Initial load:

18.1 — 38.8 N (1.8 — 4.0 kgf, 4.1 — 8.7 lbf)

Initial torque:

0.69 — 1.47 N·m (0.07 — 0.15 kgf-m, 0.51 —

1.08 ft-lb)

DI-00081

ST1

ST2

DI-00715

Preload adjusting washer

Part No.

Thickness mm (in)

383705200

2.59 (0.1020)

383715200

2.57 (0.1012)

383725200

2.55 (0.1004)

383735200

2.53 (0.0996)

383745200

2.51 (0.0988)

383755200

2.49 (0.0980)

383765200

2.47 (0.0972)

383775200

2.45 (0.0965)

383785200

2.43 (0.0957)

383795200

2.41 (0.0949)

383805200

2.39 (0.0941)

383815200

2.37 (0.0933)

383825200

2.35 (0.0925)

383835200

2.33 (0.0917)

383845200

2.31 (0.0909)

Preload adjusting spacer

Part No.

Length mm (in)

383695201

56.2 (2.213)

383695202

56.4 (2.220)

383695203

56.6 (2.228)

383695204

56.8 (2.236)

383695205

57.0 (2.244)

383695206

57.2 (2.252)

DI-00481

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