Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service 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