Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 473
FS-27
Front Crossmember
FRONT SUSPENSION
8. Front Crossmember
A: REMOVAL
1) Lift up the vehicle, and then remove the front
wheels.
2) Remove the front exhaust pipe.
3) Remove the front crossmember support plate.
<Ref. to FS-16, REMOVAL, Front Crossmember
4) Remove the front stabilizer. <Ref. to FS-17, RE-
5) Disconnect the tie-rod ends from the housing.
6) Remove the front arm. <Ref. to FS-20, REMOV-
7) Remove the nuts which install the engine mount-
ing cushion rubber onto the crossmember.
8) Remove the steering universal joint.
9) Disconnect the power steering hose from the
steering gearbox.
10) Lift the engine by approx. 10 mm (0.39 in) by
using the chain block.
11) Support the crossmember with jack, remove
the bolts which secure the crossmember to the ve-
hicle body, and gradually lower the crossmember
together with the steering gearbox.
CAUTION:
When removing the crossmember downward,
make sure that the tie-rod end does not inter-
fere with the drive shaft boot.
B: INSTALLATION
1) Install each part in the reverse order of removal.
CAUTION:
• Use a new bolt and self-locking nut. For parts
which are not reusable, refer to COMPONENT.
<Ref. to FS-3, COMPONENT, General Descrip-
• Always tighten the bushing in the state where
the vehicle is at curb weight and the wheels are
in full contact with the ground.
Tightening torque:
Crossmember to Body:
95 N·m (9.7 kgf-m, 70.1 ft-lb)
Engine mounting to Crossmember:
45 N·m (4.6 kgf-m, 33.2 ft-lb)
Front arm to Crossmember:
95 N·m (9.7 kgf-m, 70.1 ft-lb)
Support plate to Front arm:
Except for STI model: 110 N·m (11.2 kgf-m,
81.1 ft-lb)
STI model: 140 N·m (14.3 kgf-m, 103.3 ft-lb)
Front arm to Support plate (except for STI
model):
110 N·m (11.2 kgf-m, 81.1 ft-lb)
Support plate body:
150 N·m (15.3 kgf-m, 110.6 ft-lb)
Tie-rod end to Housing:
27 N·m (2.8 kgf-m, 19.9 ft-lb)
After tightening to the specified torque, tighten the
castle nut further but within 60° until the hole in the
ball stud is aligned with a slot in castle nut.
Tightening torque:
Universal joint:
24 N·m (2.4 kgf-m, 17.7 ft-lb)
Stabilizer bracket:
25 N·m (2.5 kgf-m, 18.4 ft-lb)
Stabilizer link:
38 N·m (3.9 kgf-m, 28.0 ft-lb)
Power steering hose to Steering gearbox:
15 N·m (1.5 kgf-m, 11.1 ft-lb)
2) Purge air from the power steering system.
3) Inspect the wheel alignment and adjust if neces-
sary.
C: INSPECTION
Check the crossmember for damage or cracks, and
correct or replace if defective.
FS-00118
FS-00119
FS-28
General Diagnostic Table
FRONT SUSPENSION
9. General Diagnostic Table
A: INSPECTION
1. IMPROPER VEHICLE POSTURE OR IMPROPER WHEEL ARCH HEIGHT
2. POOR RIDE COMFORT
1) Large rebound shock
2) Rocking of the vehicle continues too long after running over bump and hump.
3) Excessive shock in bumping
3. NOISE
Possible cause
Corrective action
(1) Permanent distortion or damage of the coil spring
Replace.
(2) Rough operation of strut or shock absorber
Replace.
(3) Improper installation of strut or shock absorber
Replace with appropriate parts.
(4) Installation of the wrong coil spring
Replace with appropriate parts.
Possible cause
Corrective action
(1) Damaged coil spring
Replace.
(2) Overinflation of tires
Adjust.
(3) Improper wheel arch height
Replace the coil springs with new parts.
(4) Fault in operation of strut or shock absorber
Replace.
(5) Damage or deformation of strut mount or shock absorber mount
Replace.
(6) Unsuitable length (maximum or minimum) of strut or shock absorber
Replace with appropriate parts.
(7) Abnormal deformation or loss of bushing
Replace.
(8) Deformation or damage of helper in strut assembly or shock absorber
Replace.
(9) Oil leakage from the strut or shock absorber
Replace.
Possible cause
Corrective action
(1) Wear or damage of strut or shock absorber component parts
Replace.
(2) Loosening of the suspension link installing bolt
Tighten to the specified torque.
(3) Abnormal deformation or loss of bushing
Replace.
(4) Unsuitable length (maximum or minimum) of strut or shock absorber
Replace with appropriate parts.
(5) Damaged coil spring
Replace.
(6) Wear or damage of the ball joint
Replace.
(7) Deformation of the stabilizer clamp
Replace.
REAR SUSPENSION
RS
Page
General Description . . . . . . . . . . . . . . . . . . . . ...2
Wheel Alignment . . . . . . . . . . . . . . . . . . . . . . 8
Rear Stabilizer . . . . . . . . . . . . . . . . . . . . . . . 9
Rear Trailing Link . . . . . . . . . . . . . . . . . . . . . .10
Upper Arm . . . . . . . . . . . . . . . . . . . . . . . . 13
Rear Shock Absorber . . . . . . . . . . . . . . . . . . . ...14
Front Lateral Link . . . . . . . . . . . . . . . . . . . . . .15
Rear Lateral Link . . . . . . . . . . . . . . . . . . . . . ..16
Rear Sub Frame . . . . . . . . . . . . . . . . . . . . . ...17
General Diagnostic Table . . . . . . . . . . . . . . . . . . .19
RS-2
General Description
REAR SUSPENSION
1. General Description
A: SPECIFICATION
Refer to “FS” section for rear suspension specifica-
tions. <Ref. to FS-2, SPECIFICATION, General
Description.>
NOTE:
• Front and rear toe-in and front camber can be
adjusted. Adjust if the toe-in or camber tolerance
exceeds specifications.
• Other items indicated in the specifications is not
equipped with adjustment mechanisms. If other
items exceed specifications, check the suspension
parts and connections for deformation. If defective,
replace with new parts.
(1) Front
A – B = Positive: Toe-in, Negative: Toe-out
α = Individual toe angles
B
A
(1)
FS-00269
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