Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual — part 579

PS-37

Steering Gearbox

POWER ASSISTED SYSTEM (POWER STEERING)

6. FLUID LEAKAGE

1) Lift up the vehicle.

2) If a fluid leak is found, clean the fluid completely

from the suspect area, and turn the steering wheel

30 to 40 times to the left and right from lock to lock,

with the engine running, and check again for leaks

immediately, and also after a few hours have

passed.

3) Cause and solution for oil leakage from “a”

The oil seal is damaged. Replace the valve assem-

bly or valve housing side oil seal assembly with a

new part.

4) Cause and solution for oil leakage from “b”

The torsion bar O-ring is damaged. Replace the

valve assembly with a new part.

5) Cause and solution for oil leakage from “c”

The oil seal is damaged. Replace the valve assem-

bly or pinion side oil seal with a new part.

6) Cause and solution for oil leakage from “d”

The pipe is damaged. Replace the faulty pipe or O-

ring.

7) Cause and solution for oil leakage from “g”

The hose is damaged. Replace the hose with a

new part.

8) If leak is other than a, b, c, d or g, or if oil is leak-

ing from gearbox, move the right and left boots to-

ward tie-rod end side, respectively, with the

gearbox mounted to the vehicle, and remove fluid

from surrounding portions. Then, turn the steering

wheel from lock to lock about 30 to 40 times with

the engine running, then re-inspect the leaking

area immediately after and several hours after this

operation.

(1) Leakage from “e”

The cylinder seal is damaged. Replace the oil

seal.

(2) Leakage from “f”

There are two possible causes. Perform the fol-

lowing step first. Remove the pipe assembly B

from the valve housing, and close the circuit us-

ing ST.

ST 926420000

PLUG

Turn the steering wheel from lock to lock ap-

prox. 30 to 40 times with the engine running,

then inspect the leaked portion immediately af-

ter and several hours after this operation.

• If leakage from “f” is noted again:

The oil seal of pinion and valve assembly is dam-

aged. Replace the pinion & valve assembly with a

new part. Or, replace the oil seal.

• If oil stops leaking from “f”:

The oil seal of rack housing is damaged. Replace

the oil seal and back-up ring.

(1)

Power cylinder

(3)

Rack piston

(5)

Input shaft

(2)

Cylinder

(4)

Rack axle

(6)

Valve housing

PS-00622

(4) (3) (2)

(5)

(6)

c

d

a

b

(1)

f

g

g

d

e

PS-38

Steering Gearbox

POWER ASSISTED SYSTEM (POWER STEERING)

F: ADJUSTMENT

1) Adjust the front toe.

<Ref. to FS-12, FRONT WHEEL TOE-IN, INSPEC-

TION, Wheel Alignment.>

2) Check the steering angle of the wheels.
Standard of steering angle:

3) If the steering wheel spokes are not horizontal

when wheels are set in the straight ahead position,

or error is more than 5° on the periphery of the

steering wheel, correctly re-install the steering

wheel.

4) If the steering wheel spokes are not horizontal

with vehicle set in the straight ahead position after

this adjustment, correct it by turning the right and

left tie-rods in the opposite direction from each oth-

er by the same angle.

(1) Lock nut

Inner wheel

Outer wheel

36.6°±1.5°

32.2°±1.5°

(1) 5° or less

PS-00107

(1)

PS-00513

PS-39

Pipe Assembly

POWER ASSISTED SYSTEM (POWER STEERING)

6. Pipe Assembly

A: REMOVAL

1) Disconnect the ground cable from battery.

2) Remove the under cover. <Ref. to EI-28, RE-

MOVAL, Front Under Cover.>

3) Lift up the vehicle, and remove the front cross-

member support plate.

4) Remove the one pipe joint at the center of the

gearbox, and connect the vinyl hose to the pipe and

the joint. Discharge the fluid by turning the steering

wheel fully clockwise and counterclockwise. Dis-

charge the fluid similarly from other pipes.

5) Remove the clamp E from return hose and pres-

sure hose.

6) Disconnect the return hose from return pipe and

disconnect the pressure hose from feed pipe.

7) Remove the air intake duct.

• Except for STI model: <Ref. to IN(w/o STI)-10,

REMOVAL, Air Intake Duct.>

• STI model: <Ref. to IN(STI)-10, REMOVAL, Air

Intake Duct.>

(1) Front crossmember support plate

(1) Pipe A
(2) Pipe B

PS-00445

(1)

(2)

PS-00553

(1)

(1) Pressure hose
(2) Return hose
(3) Clamp E

(1) Feed pipe
(2) Return pipe
(3) Pressure hose
(4) Return hose

PS-00537

(3)

(1)

(2)

PS-00538

(4)

(3)

(2)

(1)

PS-40

Pipe Assembly

POWER ASSISTED SYSTEM (POWER STEERING)

8) Disconnect the suction hose and pressure hose

from oil pump.

9) Disconnect the suction hose and return hose

from the reservoir tank.

10) Remove the hose bracket and take out the

hose assembly from vehicle.

B: INSTALLATION

1) Temporarily tighten the hose bracket bolt.

2) Install the plastic clip to the pressure hose and

suction hose.
CAUTION:

Align the installation position of the plastic clip

with the protector edge of the suction hose.

(1) Suction hose
(2) Pressure hose

(1) Reservoir tank
(2) Suction hose
(3) Return hose

(1) Hose ASSY
(2) Hose bracket

PS-00459

(2)

(1)

PS-00799

(3)

(1)

(2)

PS-00624

(2)

(1)

(1) Hose ASSY
(2) Hose bracket

(1) Plastic clip
(2) Protector
(3) Suction hose
(4) Pressure hose

PS-00624

(2)

(1)

PS-00456

(1)

(2)

(3)

(4)