Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 24
PM-34
Steering System (Power Steering)
PERIODIC MAINTENANCE SERVICES
24.Steering System (Power
Steering)
A: INSPECTION
1. STEERING WHEEL
1) Set the steering wheel in a straight-ahead posi-
tion, and check the wheel spokes to make sure
they are correctly set in their specified positions.
2) Lightly turn the steering wheel to the left and
right to determine the point where front wheels start
to move.
Measure the distance of the movement of steering
wheel at the outer periphery of wheel.
Steering wheel free play:
0 — 17 mm (0 — 0.67 in)
Move the steering wheel vertically toward the shaft
to ascertain if there is play in the direction.
Maximum permissible play:
0.5 mm (0.020 in)
3) Drive the vehicle and check the following items
during operation.
(1) Steering force:
The effort required for steering should be
smooth and even at all points, and should not
vary.
(2) Pulled to one side:
Steering wheel should not be pulled to either
side while driving on a level surface.
(3) Wheel runout:
Steering wheel should not show any sign of
runout.
(4) Return factor:
Steering wheel should return to its original posi-
tion after it has been turned and then released.
2. STEERING SHAFT JOINT
If steering wheel play is excessive, disconnect the
universal joint of steering shaft and then check the
play where the joints cross and yawing torque. Al-
so, check the seal for damage or serrations for
wear. If loose joints, tighten the mounting bolts to
specified torque.
Tightening torque:
24 N·m (2.4 kgf-m, 17.7 ft-lb)
3. GEARBOX
1) With the vehicle placed on a level surface, turn
the steering wheel 90° in both the left and right di-
rections.
While the wheel is being rotated, reach under the
vehicle and check for looseness in gearbox.
Tightening torque:
60 N·m (6.1 kgf-m, 44.3 ft-lb)
2) Check the boot for damage, cracks or deteriora-
tion.
(1) Steering wheel free play
(1)
PS-00450
(A) Boot
(B) Gearbox mounting bolt
PM-00392
PM-00393
(A)
(A)
(B)
(B)
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PM-35
Steering System (Power Steering)
PERIODIC MAINTENANCE SERVICES
3) With the vehicle placed on a level surface, quick-
ly turn the steering wheel to the left and right.
While steering wheel is being rotated, check the
gear backlash. If any noise is noticed, adjust the
gear backlash in the following manner.
(1) Loosen the adjusting screw, and apply liquid
gasket to at least 1/3 of the entire perimeter of
adjusting screw thread.
Liquid gasket:
THREE BOND 1102 or 1215
(2) Tighten the adjusting screw, then loosen it.
CAUTION:
Adjust the steering rack to the straight forward
position.
Tightening torque:
25 N·m (2.5 kgf-m, 18 ft-lb)
(3) Tighten the adjusting screw, then loosen it.
(4) Tighten the adjusting screw.
Tightening torque:
5.9 N·m (0.6 kgf-m, 4.2 ft-lb)
(5) Then, return the adjusting screw by 20° and
fix it.
(6) Install the lock nut. While holding the adjust-
ing screw with wrench, tighten the lock nut us-
ing ST.
ST 926230000
SPANNER
Tightening torque (lock nut):
25 N·m (2.5 kgf-m, 18 ft-lb)
Hold the adjusting screw with wrench to prevent
it from turning while tightening the lock nut.
4. TIE-ROD
1) Check the tie-rod and tie-rod end for bend,
cracks or other damages.
2) Make sure there is free play at the connection of
knuckle ball joint and check the dust seal for dam-
age, and the ball stud for play. If loose castle nut,
tighten it to the specified tightening torque, and
tighten further within 60° until the cotter pin hole is
aligned.
Tightening torque:
27 N·m (2.75 kgf-m, 19.9 ft-lb)
3) Check the tightening of tie-rod end lock nut. If it
is loose, tighten it to the specified torque.
Tightening torque:
85 N·m (8.7 kgf-m, 62.7 ft-lb)
5. POWER STEERING FLUID LEVEL
NOTE:
• At power steering fluid temperature 20°C (68°F);
read the fluid level on the “COLD” side.
• At power steering fluid temperature 80°C
(176°F); read the fluid level on the “HOT” side.
1) Place the vehicle with engine “OFF” on a level
surface.
2) Check the fluid level using the scale on the out-
side of the reservoir tank (A). If the level is below
“MIN”, fill fluid up to “MAX” level.
(1) Apply liquid gasket to 1/3 or more of the entire
perimeter.
PS-00092
(A) Tie-rod end
(B) Tie-rod
PM-00394
(A)
(B)
PI-00461
(A)
HOT MAX
COLD MAX
HOT MIN
COLD MIN
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PM-36
Steering System (Power Steering)
PERIODIC MAINTENANCE SERVICES
CAUTION:
If the power steering fluid is spilt over exhaust
pipe, wipe it off with cloth to avoid emitting
smoke or causing a fire.
NOTE:
If fluid level is at MAX level or above, drain fluid to
keep the level in the specified range of indicator by
using a syringe or the like.
Recommended fluid:
Refer to “RM” section. <Ref. to RM-4, FLUID,
RECOMMENDED MATERIALS, Recommend-
Fluid capacity:
0.7 L (0.7 US qt, 0.6 Imp qt)
6. POWER STEERING FLUID FOR LEAKS
Inspect the underside of oil pump and gearbox of
power steering system, hoses, pipes and their cou-
plings for fluid leaks.
If fluid leakage is found, tighten the mounting bolt
(or nut) again or replace with a new part.
NOTE:
• Wipe the leaked fluid off after correcting fluid
leaks.
• When inspecting the fluid leakage, be careful of
the clearance between the hose (or piping) and
other parts.
7. HOSES OF OIL PUMP FOR DAMAGES
Check the pressure hose and return hose of oil
pump for crack, swell or damage. Replace the hose
with a new part if necessary.
NOTE:
Prevent hoses from turning and/or bending when
installing hoses.
8. POWER STEERING PIPES FOR DAMAG-
ES
Check the power steering pipes for corrosion and
damage.
Replace the pipe with a new part if necessary.
9. GEARBOX BOOTS
Inspect both sides of the gearbox boot as follows,
and correct the defects if necessary.
1) Positions (A) and (B) of the gearbox boot are fit-
ted correspondingly in grooves (A) and (B) of the
gearbox and rod (C).
2) Clips are fitted onto the boot grooves to the po-
sitions (A) and (B) of the boot.
3) Boot does not have crack or hole.
NOTE:
Rotate (B) position of gearbox boot against the tor-
sion produced by the adjustment of toe-in etc.
10.FITTING BOLTS AND NUTS
Inspect the fitting bolts and nuts of oil pump and
bracket for looseness, and retighten them if neces-
sary.
Inspect and/or retighten them when engine is cold.
(1) Reservoir tank
(2) Suction hose
(3) Return hose
(4) Pressure hose
PM-00446
(3)
(1)
(2)
(4)
(C)
(B)
(A)
PM-00090
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PM-37
A/C Filter
PERIODIC MAINTENANCE SERVICES
25.A/C Filter
A: REPLACEMENT
1) Remove the glove box damper.
2) Disengage the stopper section and pull the glove
box lid to remove it.
3) Pinch the claw to unlock and remove the A/C fil-
ter.
4) Install in the reverse order of removal.
EI-01887
EI-01831
AC-01789
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