Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 23
PM-30
Suspension
PERIODIC MAINTENANCE SERVICES
3. WHEEL ARCH HEIGHT
1) Unload the vehicle, so that it is at curb weight.
2) Check the wheel arch height of the front and rear
suspensions to ensure that they are within toler-
ance. <Ref. to FS-8, Wheel Alignment.>
3) If the wheel arch height is out of the specifica-
tion, visually check the following components and
replace deformed parts.
• Suspension components [Front strut assembly
and rear shock absorber assembly]
• Parts connecting suspension and body
4) When no components are deformed, adjust the
wheel arch height by replacing the suspension for
which the wheel arch height is not within tolerance.
<Ref. to FS-8, Wheel Alignment.>
4. WHEEL ALIGNMENT OF FRONT SUS-
PENSION
1) Check the alignment of front suspension to
make sure the following items are within tolerance.
• Toe-in
• Camber
• Caster (referential value)
• Steering angle
<Ref. to FS-8, Wheel Alignment.>
2) When the caster angle does not conform to the
reference value obviously, visually inspect the fol-
lowing components and replace deformed parts.
• Suspension components [Strut assembly, cross-
member, front arm, etc.]
• Parts connecting suspension and body
3) When the toe-in and camber are outside of the
tolerance value, adjust each one so that they con-
form to the tolerance value.
4) When the rotating angles of the right and left
tires are not within tolerance, adjust them to stan-
dard. <Ref. to FS-8, Wheel Alignment.>
5. WHEEL ALIGNMENT OF REAR SUS-
PENSION
1) Inspect the alignment of the rear suspension and
check the following items are within the specified
range.
• Toe-in
• Camber
• Thrust angle
<Ref. to RS-8, Wheel Alignment.>
2) If camber is out of the specification, visually
check the items listed below. If the deformation is
found, replace the damaged part.
• Suspension component [shock absorber, front
lateral link, rear lateral link, upper arm, trailing link,
sub frame etc.]
• Parts connecting suspension and body
3) If the toe-in or thrust angle is out of the tolerance,
adjust to the tolerance value. <Ref. to FS-8, Wheel
6. OIL LEAKAGE OF STRUT AND SHOCK
ABSORBER
Visually inspect the front strut and rear shock ab-
sorber for oil leakage. Replace the front strut and
rear shock absorber if oil leaks excessively.
7. TIGHTNESS OF BOLTS AND NUTS
Check the bolts and nuts for looseness. Retighten
the bolts and nuts to specified torque. If the self-
locking nuts and bolts are removed, replace them
with new parts.
Front suspension: <Ref. to FS-2, General Descrip-
Rear suspension: <Ref. to RS-2, General Descrip-
8. DAMAGE TO SUSPENSION PARTS
Check the following parts and the fastening portion
of the vehicle body for deformation or excessive
rusting which impairs the suspension. If necessary,
replace the damaged parts with new parts. If minor
rust formation, pitting, etc. are noted, remove the
rust and take rust prevention measure.
• Front suspension
• Front arm
• Crossmember
• Strut
• Rear suspension
• Sub frame
• Front lateral link
• Rear lateral link
• Upper arm
• Trailing link
• Shock absorber
• In the area where salt is sprayed to melt snow on
a road in winter, check suspension parts for dam-
age caused by rust every 12 months after lapse of
60 months. Take rust prevention measures as re-
quired.
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PM-31
Wheel Bearing
PERIODIC MAINTENANCE SERVICES
21.Wheel Bearing
A: INSPECTION
1. FRONT HUB UNIT
1) Jack-up the front side of vehicle.
2) While holding the front wheel by hand, swing it in
and out to check that there is no bearing free play.
3) Loosen the wheel nuts, and remove the front
wheel.
4) If the bearing free play exists in step 2) above,
attach a dial gauge to hub and measure the loose-
ness in the axial direction.
Service limit:
Straight-ahead position within 0.05 mm
(0.0020 in)
5) Remove the bolts and self-locking nuts, and ex-
tract transverse link from the front crossmember.
6) Remove the AAR of front drive shaft from trans-
mission. <Ref. to DS-14, Front Axle.>
7) While supporting the front drive shaft horizontal-
ly with one hand, turn the hub with the other hand to
check for noise or binding.
If the hub is noisy or binds, replace the front hub
unit.
2. REAR HUB UNIT
1) Jack-up the rear side of vehicle.
2) While holding the rear wheel by hand, swing it in
and out to check bearing free play.
3) Loosen the wheel nuts, and remove the rear
wheel.
4) If the bearing free play exists in step 2) above,
attach a dial gauge to hub and measure the loose-
ness in the axial direction.
Service limit:
Straight-ahead position within 0.05 mm
(0.0020 in)
5) Remove the EDJ of the rear drive shaft from the
rear differential. <Ref. to DS-35, Rear Drive Shaft.>
6) While supporting rear drive shaft horizontally
with one hand, turn the hub with the other to check
for noise or binding.
If the hub is noisy or binds, replace the rear hub
unit.
PM-00408
PM-00408
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PM-32
Axle Boots & Joints
PERIODIC MAINTENANCE SERVICES
22.Axle Boots & Joints
A: INSPECTION
1. FRONT AND REAR AXLE BOOTS
Inspect the front axle boots (A) and rear axle boots
(B) for deformation, damage or failure. If faulty, re-
place with new part. <Ref. to DS-27, Front Drive
Shaft.> <Ref. to DS-35, Rear Drive Shaft.>
2. PROPELLER SHAFT
Inspect the propeller shaft for damage or failure. If
faulty, replace with new part. <Ref. to DS-11, Pro-
PM-00390
(A)
PM-00391
(B)
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PM-33
Tire Rotation
PERIODIC MAINTENANCE SERVICES
23.Tire Rotation
A: INSPECTION
1) When the tread has worn down to less than 1.6
mm (0.063 in) or the wear indicator appears across
the tread, replace the tire. (Replace the right and
left tires as a set.)
2) If the tire appears to be worn unevenly, adjust
the wheel alignment.
3) Next, make a tire rotation between front and rear
as shown in the figure, make sure tires are worn
evenly.
• When the direction of tire rotation is not specified
• When the direction of tire rotation is specified
(A) New tread
(B) Damaged tread
(C) Tread wear indicator
(1) Front
(1) Front
(A)
(B)
(C)
PM-00080
WT-00113
1
WT-00115
1
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