Subaru 2009 IMPREZA, Service Manual

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PM-40
Suspension
PERIODIC MAINTENANCE SERVICES
3. WHEEL ARCH HEIGHT
1) Unload the cargoes and set the vehicle in curb
weight (empty) condition.
2) Check the wheel arch height of front and rear
suspensions to ensure that they are within speci-
fied values. <Ref. to FS-7, Wheel Alignment.>
3) When the wheel arch height is out of the toler-
ance value, visually inspect the following compo-
nents and replace deformed parts.
• Suspension components [Front strut assembly
and rear strut assembly]
• Parts connecting suspension and body
4) When no components are deformed, adjust
wheel arch height by replacing coil spring in the
suspension whose wheel arch height is out of stan-
dard. <Ref. to FS-7, Wheel Alignment.>
4. WHEEL ALIGNMENT OF FRONT
SUSPENSION
1) Check the alignment of front suspension to
make sure the following items are within tolerance.
• Toe-in
• Camber
• Caster
• Steering angle
<Ref. to FS-7, 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 out of tolerance
value, adjust them so that they conform to standard
value.
4) When the right-and-left turning angles of tire are
out of standard, adjust to standard value.
5. WHEEL ALIGNMENT OF REAR
SUSPENSION
1) Check the alignment of rear suspension to make
sure the following items are within tolerance.
• Toe-in
• Camber
• Thrust angle
<Ref. to RS-8, Wheel Alignment.>
2) When the camber angle does not conform to tol-
erance value, visually inspect the following compo-
nents. If the deformation is observed, replace the
damaged parts.
• Suspension components [Shock absorber, front
lateral link, rear lateral link, upper arm, trailing link
and sub frame]
• Parts connecting suspension and body
3) When the toe-in and thrust angle are out of toler-
ance value, adjust them so that they conform to tol-
erance value.
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-
tion.>
Rear suspension: <Ref. to RS-2, General Descrip-
tion.>
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.