Subaru Impreza 2003, Service Manual

Page: 2669 / 3610

PS-45
POWER ASSISTED SYSTEM (POWER STEERING)
STEERING GEARBOX [LHD MODEL]
6. OIL LEAKING
1) Lift up the vehicle.
2) Even if the location of the leak can be easily
found by observing the leaking condition, it is nec-
essary to thoroughly remove the fluid from the sus-
pected portion and turn the steering wheel from
lock to lock about thirty to forty times with engine
running, then make comparison of the suspected
portion between immediately after and several
hours after this operation.
3) Inspect leakage from “a”.
The oil seal is damaged. Replace the valve assem-
bly with a new one.
4) Inspect leakage from “b”.
The torsion bar O-ring is damaged. Replace the
valve assembly with a new one.
5) Inspect leakage from “c”.
The oil seal is damaged. Replace the valve assem-
bly or oil seal with a new one.
6) Inspect leakage from “d”.
The pipe is damaged. Replace the faulty pipe or O-
ring.
7) Inspect leakage from “g”.
The hose is damaged. Replace the hose with a
new one.
8) If leak is other than a, b, c, d, or g, and if oil is
leaking from the gearbox, move the right and left
boots toward tie-rod end side, respectively, with the
gearbox mounted to the vehicle, and remove fluid
from the surrounding portions. Then, turn the steer-
ing wheel from lock to lock thirty to forty times with
the engine running, then make comparison of the
leaked portion immediately after and several hours
after this operation. (1) Leakage from “e”
The cylinder seal is damaged. Replace the rack
bush with a new one.
(2) Leakage from “f”
There are two possible causes. Take the follow-
ing step first. Remove the pipe assembly B from
the valve housing, and close the circuit with ST.
ST 926420000 PLUG
Turn the steering wheel from lock to lock thirty to
forty times with the engine running, then make
comparison of the leaked portion between im-
mediately after and several hours after this op-
eration.
• If leakage from “f” is noted again:
The oil seal of pinion and valve assembly is dam-
aged. Replace the pinion and valve assembly with
a new one. Or replace the oil seal and parts that are
damaged during disassembly with new ones.
• If oil stops leaking from “f”:
The oil seal of rack housing is damaged. Replace
the oil seal and the parts that are damaged during
disassembly with new ones.
(1) Power cylinder (3) Rack piston (5) Input shaft
(2) Cylinder (4) Rack axle (6) Valve housing
PS-00272
(4) (3) (2)
(5)
(6)
c
d
d
a
b
(1)
d
e
d
f
g
d
g