Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual - part 511

DS-17

Front Axle

DRIVE SHAFT SYSTEM

D: ASSEMBLY

1) Assemble  the  front  hub  unit  bearing.  <Ref.  to

DS-19, ASSEMBLY, Front Hub Unit Bearing.>

2) Place  the  disc  cover  between  housing  (A)  and

front hub unit, and tighten the four bolts.

Tightening torque:

65 N·m (6.63 kgf-m, 47.9 ft-lb)

CAUTION:

• Do  not  get  closer  the  tool  which  charged

magnetism to magnetic encoder.

• Be  careful  not  to  damage  the  magnetic  en-

coder.

E: INSPECTION

1) Moving  the  front  tire  up  and  down  by  hand,

check  there  is  no  play  in  bearing,  and  check  the

wheel rotates smoothly.

2) Inspect  the  lean  of  axis  direction  using  a  dial

gauge. Replace the bearing if the load range ex-

ceeds the limitation.
Service limit:

Maximum: 0.05 mm (0.0020 in)

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

DS-00231

(A)

DS-00250

(2)

(1)

DS-00061

DS-00062

DS-18

Front Hub Unit Bearing

DRIVE SHAFT SYSTEM

4. Front Hub Unit Bearing

A: REMOVAL

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

wheels.

2) Lift the crimped section of axle nut.

3) 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.

4) Remove the disc brake caliper from the housing,

and suspend it from strut using a wire.

5) Remove the disc rotor from the hub.
NOTE:

If it is difficult to remove the disc rotor from the hub,

drive the 8 mm bolt into the threaded end of rotor,

and then remove the rotor.

6) Remove the four bolts from the housing.

CAUTION:

• Do  not  get  closer  the  tool  which  charged

magnetism to magnetic encoder.

• Be  careful  not  to  damage  the  magnetic  en-

coder.

7) Remove the front hub unit bearing. If it is hard to

remove, use the ST.

ST1 926470000

AXLE SHAFT PULLER

ST2 28099PA110

AXLE SHAFT PULLER 

PLATE

DS-00038

DS-00041

(A) Housing

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

DS-00231

(A)

DS-00250

(2)

(1)

DS-00145

ST2

ST1

DS-19

Front Hub Unit Bearing

DRIVE SHAFT SYSTEM

B: INSTALLATION

1) Place  the  disc  cover  between  housing  (A)  and

front hub unit, and tighten the four bolts.

Tightening torque:

65 N·m (6.63 kgf-m, 47.9 ft-lb)

2) Install the front drive shaft. <Ref. to DS-27, IN-

STALLATION, Front Drive Shaft.>

3) Tighten the axle nut temporarily.

4) Install the disc rotor to hub.

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

17-inch type

155 N·m (15.81 kgf-m, 114.3 ft-lb)

16-inch type

80 N·m (8.16 kgf-m, 59 ft-lb)

6) While depressing the brake pedal, tighten a new

axle nut to the specified torque and lock it securely.
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)

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

8) Install the wheel.
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 (1) can not be disassem-

bled, only hub bolts can be removed.

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

Refer  to  “Front  Axle”  for  inspection  procedures.

<Ref. to DS-17, INSPECTION, Front Axle.>
CAUTION:

If there is any fault in the bearing, replace hub

unit bearing.

DS-00231

(A)

DS-00048

(1) Front hub unit bearing

DS-00252

ST

(1)

DS-00253

ST

(1)

DS-20

Rear Axle

DRIVE SHAFT SYSTEM

5. Rear Axle

A: REMOVAL

1) Disconnect the ground cable from battery.

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

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 rear axle is

loaded. Doing so may damage the hub bearing.

5) Remove  the  brake  hose  bracket  and  the  rear

ABS wheel speed sensor.

6) Remove  the  disc  brake  caliper  from  the  rear

housing, and suspend it from vehicle using a string.

7) Remove the rear disc rotor.

8) Remove the four bolts from the rear housing.

9) Remove the rear hub unit bearing.
CAUTION:

• Be  careful  not  to  damage  the  magnetic  en-

coder.

• Do  not  get  closer  the  tool  which  charged

magnetism to magnetic encoder.

DS-00038

DS-00412

FU-03358

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

DS-00414

DS-00251

(2)

(1)

DS-00360