Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual — part 472

FS-23

Front Arm

FRONT SUSPENSION

3) Using the ST and a press, install the rear bush-

ing.

ST1 20299AG000 REMOVER

ST2 20299AG010 BASE

Aluminum front arm
1) Install the pillow ball bushing with its longer inner

cylinder facing upward and the shorter facing

downward as shown in the figure.

2) Align the center of rear bushing recess portion

with the aligning mark on the front arm.

3) Using the ST and a press, install the rear bush-

ing.

ST1 20299AE020

INSTALLER & REMOVER

ST2 18723AA000

REMOVER ASSY (GEAR

DRIVEN)

NOTE:

Place the plate on the ST1 to use the press.

E: INSPECTION

1) Check the front arm for damage or cracks, and

correct or replace if defective.

2) Check the bushing for abnormal fatigue or dam-

age.

3) Check the pillow ball bushing for damage or

cracks, and replace if defective.

4) Try to wobble the pillow ball bushing. Replace

the pillow ball bushing if backlash or resistance are

found.

(1) Press
(2) Front arm
(3) Rear bushing

(1) Front arm
(2) Bushing inner cylinder
(3) Longer
(4) Shorter

(1) Alignment mark
(2) Recess section

FS-00127

(1)

(2)

(3)

ST2

ST1

FS-00441

(1)

(2)

(3)

(4)

FS-00440

(1)

(2)

(1)

(1) Press
(2) Front arm
(3) Rear bushing
(4) Plate

FS-00426

(1)

(2)

(3)

ST1

(4)

ST2

FS-24

Front Strut

FRONT SUSPENSION

7. Front Strut

A: REMOVAL

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

wheels.

2) Place an alignment mark on the camber adjust-

ing bolt and strut.

3) Remove the brake hose bracket.

4) Remove the bolt securing the ABS wheel speed

sensor harness.

5) Remove the two bolts securing the housing to

the strut.
NOTE:

While holding the head of the adjusting bolt, loosen

the flange nut.

6) Remove the three nuts securing strut mount to

body.

B: INSTALLATION

1) Install the strut mount at the upper side of strut to

body, and tighten it with new self-locking nuts.
Tightening torque:

20 N·m (2.0 kgf-m, 14.8 ft-lb)

2) Align alignment marks on the camber adjusting

bolt and strut.

Using new flange nuts, install the strut to the hous-

ing.
NOTE:

While holding the head of adjusting bolt, tighten the

flange nut.
Tightening torque:

155 N·m (15.8 kgf-m, 114.3 ft-lb)

3) Secure the ABS wheel speed sensor harness to

the strut.
Tightening torque:

33 N·m (3.4 kgf-m, 24.3 ft-lb)

4) Install the brake hose bracket.
Tightening torque:

33 N·m (3.4 kgf-m, 24.3 ft-lb)

5) Install the front wheels.

6) Inspect the wheel alignment and adjust if neces-

sary.

FS-00037

FS-00038

FS-00039

FS-25

Front Strut

FRONT SUSPENSION

C: DISASSEMBLY

1) Using a coil spring compressor, compress the

coil spring.

2) Using the ST, remove the self-locking nut.

ST 20399AG000 STRUT MOUNT SOCKET

3) Remove the strut mount and upper spring seat

from strut.

4) Gradually decrease the compression force of

compressor, and remove the coil spring.

5) Remove the dust cover.

D: ASSEMBLY

1) Using a coil spring compressor, compress the

coil spring.
NOTE:

Make sure that the vertical install direction of the

coil spring is as shown in the figure.

2) Set the coil spring correctly so that its end face

seats well in the spring seat as shown in the figure.

3) Install the dust cover to the piston rod.

4) Pull the piston rod fully upward, and install the

spring seat.
NOTE:

Position the upper spring seat as shown in the fig-

ure.

5) Install the strut mount and spacer to piston rod,

and temporarily attach and tighten a new self lock-

ing nut.

6) Using a hexagon wrench to prevent strut rod

from turning, tighten the new self-locking nut with

ST.

ST 20399AG000 STRUT MOUNT SOCKET
Tightening torque:

55 N·m (5.6 kgf-m, 40.6 ft-lb)

7) Loosen the coil spring compressor carefully.

(1) Diameter is small (upper part)
(2) Identification paint
(3) Diameter is large (bottom part)

FS-00040

FS-00041

ST

FS-00042

(2)

(1)

(3)

(1) Coil spring end face

(1) Outside of body

FS-00043

(1)

FS-00128

(1)

FS-00041

ST

FS-26

Front Strut

FRONT SUSPENSION

E: INSPECTION

Check the removed part for wear, damage and

cracks, and then repair or replace it if defective.

1. STRUT

1) Check for oil leaks.

2) Move the piston rod up and down to check that it

operates smoothly without any hitch.

3) Piston rod play

• Measure the play as follows:

Fix the outer shell in place and fully extend the rod.

Set a dial gauge at the end of rod L [10 mm (0.39

in)], and then read the dial gauge indication P

1

while applying a force of W [20 N (2 kgf, 4 lbf)] to

the threaded portion. Apply a force of 20 N (2 kgf, 4

lbf) from the opposite direction of “W”, and then

read the dial gauge indication P

2

.

Play limit (P

1

+ P

2

):

0.8 mm (0.031 in)

If the play exceeds limit, replace the strut.

2. STRUT MOUNT

Check the rubber part for deformation, cracks or

deterioration, and then replace it with a new part if

defective.

3. DUST COVER

If cracks or damage are found, replace with a new

part.

4. COIL SPRING

If a permanent strain is found, replaced it with a

new part.

5. HELPER

If major cracks or damage are found, replace it with

a new part. (Except for STI model)

F: DISPOSAL

CAUTION:

• Before handling struts, be sure to wear gog-

gles to protect eyes from gas, oil and cutting

powder.

• Do not disassemble the strut damper or

throw into flames.

• When discarding gas filled struts, drill holes

in them to purge the gas.

1) Place the strut on a level surface with the piston

rod fully expanded.

2) Using a 2 — 3 mm (0.08 — 0.12 in) dia. drill,

make a hole into the position (1) first, and then (2).

FS-00046

W

L

(1) 20 mm (0.78 in)
(2) 10 mm (0.39 in)
(3) Strut
(4) Damping tube

FS-00096

(1)

(4)

(2)

(3)