Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual - part 513

DS-25

Rear Hub Unit Bearing

DRIVE SHAFT SYSTEM

B: INSTALLATION

1) Aligning with the mounting hole of the rear brake

back  plate,  temporarily  tighten  the  rear  hub  unit

bearing to the rear housing.
CAUTION:

• Be  careful  not  to  damage  the  magnetic  en-

coder.

• Do  not  get  closer  the  tool  which  charged

magnetism to magnetic encoder.

2) Tighten the four bolts of the rear housing.

Tightening torque:

65 N·m (6.63 kgf-m, 47.9 ft-lb)

3) Tighten the new axle nut temporarily.

4) Install the rear disc rotor.

5) Install the disc brake caliper on the rear housing.
Tightening torque:

17-inch type

65 N·m (6.63 kgf-m, 47.9 ft-lb)

15-inch type

66 N·m (6.73 kgf-m, 48.7 ft-lb)

6) While pressing the brake pedal, tighten the new

axle nuts to the specified torque.
Tightening torque:

190 N·m (19.4 kgf-m, 140.1 ft-lb)

CAUTION:

Do  not  apply  weight  to  the  rear  axle  before

tightening the axle nut. Doing so may damage

the hub bearing.

7) After tightening the axle nut, lock it securely.

8) Install the rear wheels.
Tightening torque:

100 N·m (10.20 kgf-m, 73.8 ft-lb)

C: DISASSEMBLY

Using the ST and a hydraulic press, push out the

hub bolts.
CAUTION:

• Be careful not to hammer the hub bolts. This

may deform the hub.

• Do not reuse the hub bolt.

ST 28399AG000 HUB STAND
NOTE:

Since  the  hub  unit  bearing  can  not  be  disassem-

bled, only hub bolts can be removed.

(1) Magnetic encoder
(2) Rear hub unit bearing

DS-00251

(2)

(1)

DS-00414

(1) Rear hub unit bearing

DS-00048

DS-00254

ST

(1)

DS-26

Rear Hub Unit Bearing

DRIVE SHAFT SYSTEM

D: ASSEMBLY

1) Attach the hub to the ST securely.

ST 28099PA080 HUB STAND

2) Using a press, press the new hub bolts until their

seating surfaces contact the hub.
NOTE:

Use  the  12  mm  (0.47  in)  dia.  holes  in  the  HUB

STAND to prevent bolts from tilting.

E: INSPECTION

1) Moving the rear tire up and down by hand, check

there  is  no  backlash  in  bearing,  and  check  the

wheel rotates smoothly.

2) Inspect  the  lean  of  axis  direction  using  a  dial

gauge. Replace the hub bearing if the play exceeds

the limit value.
Service limit:

Maximum: 0.05 mm (0.0020 in)

(1) Rear hub unit bearing

DS-00255

ST

(1)

DS-00183

DS-00062

DS-27

Front Drive Shaft

DRIVE SHAFT SYSTEM

7. Front Drive Shaft

A: REMOVAL

1) Disconnect the ground cable from battery.

2) Lift  up  the  vehicle,  and  then  remove  the  front

wheels.

3) Lift the crimped section of axle nut.

4) Remove  the  axle  nut  using  a  socket  wrench

while depressing the brake pedal.
CAUTION:

Do not loosen the axle nut while the front axle is

loaded. Doing so may damage the hub bearing.

5) Drain the transmission gear oil.

6) Remove the stabilizer link from front arm.

7) Disconnect the front arm ball joint from the hous-

ing.

8) Remove  the  front  drive  shaft  assembly.  If  it  is

hard to remove, use ST1 and ST2.

ST1 926470000

AXLE SHAFT PULLER

ST2 28099PA110

AXLE SHAFT PULLER 

PLATE

9) Using  a  bar,  remove  the  front  drive  shaft  from

transmission.
CAUTION:

Be careful not to allow the bar to damage holder

area.

B: INSTALLATION

1) Replace the differential side retainer oil seal with

a new part.
NOTE:

After pulling out the drive shaft, be sure to replace

with a new oil seal.
6MT model: <Ref. to 6MT-28, REPLACEMENT, 

Differential Side Retainer Oil Seal.>
5MT model: <Ref. to 5MT-32, REPLACEMENT, 

Differential Side Retainer Oil Seal.>

2) Insert the AC into hub splines.

3) Draw the drive shaft into specified position.
CAUTION:

Do not hammer drive shaft when installing it.

4) Tighten the axle nut temporarily.

5) Using the ST, install the front drive shaft to trans-

mission.

ST 28399SA010 OIL SEAL PROTECTOR

6) Connect the front arm ball joint to the housing.
Tightening torque:

50 N·m (5.10 kgf-m, 36.9 ft-lb)

7) Install the stabilizer link.
CAUTION:

Use a new flange nut.
Tightening torque:

38 N·m (3.87 kgf-m, 28 ft-lb)

8) While pressing the brake pedal, tighten the new

axle nuts to the specified torque.
CAUTION:

Do  not  apply  weight  to  the  front  axle  before

tightening the axle nut. Doing so may damage

the hub bearing.
Tightening torque:

220 N·m (22.43 kgf-m, 162.3 ft-lb)

9) After tightening axle nut, lock it securely.

DS-00038

FS-00106

DS-00145

ST2

ST1

AT-00110

ST

DS-28

Front Drive Shaft

DRIVE SHAFT SYSTEM

10) Fill transmission gear oil.

11) Install the front wheels.
Tightening torque:

100 N·m (10.20 kgf-m, 73.8 ft-lb)

12) Connect the battery ground terminal.

13) Inspect the wheel alignment and adjust if nec-

essary.

C: DISASSEMBLY

1. EXCEPT FOR STI MODEL

1) Place  alignment  marks  on  the  shaft  and  outer

race.

2) Remove the PTJ boot band and boot.
CAUTION:

Be careful not to damage the boot.

3) Remove the snap ring from PTJ outer race.

4) Remove the PTJ outer race from shaft assem-

bly.

5) Wipe off grease.
CAUTION:

The grease is a special type of grease. Do not

mix with other grease.

6) Place alignment marks on the roller kit and trun-

nion.

7) Remove the roller kit from trunnion.
CAUTION:

Be careful with the roller kit position.

8) Place  alignment  marks  on  the  trunnion  and

shaft.

DS-00106

DS-00107

DS-00108

DS-00109

DS-00110