Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 471
FS-19
Front Ball Joint
FRONT SUSPENSION
C: INSPECTION
1) Measure the play of the ball joint using the fol-
lowing procedures. Replace with a new part if the
play exceeds specification.
(1) With 686 N (70 kgf, 154 lbf) loaded in direc-
tion shown in the figure, measure the length L
1
.
(2) With 686 N (70 kgf, 154 lbf) loaded in direc-
tion shown in the figure, measure the length L
2
.
(3) Determine free play using the following for-
mula.
S = L
2
– L
1
(4) Replace with a new part if the play exceeds
specification.
Front ball joint
Specification for replacement S:
Less than 0.3 mm (0.012 in)
2) If the play is within specification, visually check
the dust cover.
3) Remove the ball joint and cover, and check for
wear, damage or cracks. If any damage is found,
replace the corresponding part.
4) If the dust cover is damaged, replace with a new
ball joint.
FS-00035
FS-00036
FS-20
Front Arm
FRONT SUSPENSION
6. Front Arm
A: REMOVAL
1) Lift up the vehicle, and then remove the front
wheels.
2) Remove the front crossmember support plate.
<Ref. to FS-16, REMOVAL, Front Crossmember
3) Remove the front stabilizer. <Ref. to FS-17, RE-
4) Remove the ball joint of front arm.
5) Remove the nut securing the front arm to cross-
member. (Do not remove the bolt.)
6) Remove the front arm support plate.
7) Remove the bolt securing front arm to cross-
member and pull the front arm out of the cross-
member.
8) To remove the stud bolt, use the ST. (Except for
STI model)
CAUTION:
Do not remove the stud bolt unnecessarily. Al-
ways replace the parts with new parts when re-
moved.
ST 20299AG020 STUD BOLT SOCKET
B: INSTALLATION
1) Using the ST, install the stud bolt. (Except for
STI model)
ST 20299AG020 STUD BOLT SOCKET
Tightening torque:
110 N·m (11.2 kgf-m, 81.1 ft-lb)
2) Using new bolts and self-locking nuts, temporari-
ly tighten the front arm to crossmember.
3) Attach the support plate.
• Except for STI model
Secure the front arm to body, and then install the
support plate with new bolts and self-locking nuts.
• STI model
Secure the front arm to body, and then install the
support plate with new bolts.
Tightening torque:
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)
Support plate to Body:
150 N·m (15.3 kgf-m, 110.6 ft-lb)
FS-00106
FS-00107
FS-00108
(1) Vehicle body
(2) Stud bolt
FS-00279
(2)
(1)
ST
FS-21
Front Arm
FRONT SUSPENSION
4) Install the ball joint into housing.
Tightening torque:
50 N·m (5.1 kgf-m, 36.9 ft-lb)
5) Install the stabilizer. <Ref. to FS-17, INSTALLA-
6) Install the front wheels.
7) Lower the vehicle from lift, and tighten the bolt
which secures the front arm to crossmember with
wheels in full contact with the ground and the vehi-
cle at curb weight.
Tightening torque:
95 N·m (9.7 kgf-m, 70.1 ft-lb)
8) Inspect the wheel alignment and adjust if neces-
sary.
C: DISASSEMBLY
1. FRONT BUSHING
Using the ST and a press, remove the front bush-
ing.
ST 927680000
INSTALLER & REMOVER
SET
2. REAR BUSHING
Steel front arm
1) Put an alignment mark on the front arm based on
the center of rear bushing recess portion.
CAUTION:
Always put an alignment mark for aligning the
position on bushing installation.
2) Using the ST and a press, remove the rear bush-
ing.
ST1 20299AG000 REMOVER
ST2 20299AG010 BASE
FS-00110
ST
(1) Put an alignment mark.
(2) Recess section
(1) Press
(2) Front arm
(3) Rear bushing
FS-00111
(1)
(2)
(1)
FS-00126
(1)
(2)
(3)
ST2
ST1
FS-22
Front Arm
FRONT SUSPENSION
Aluminum front arm
1) Put an alignment mark on the front arm based on
the center of pillow ball bushing recess portion.
CAUTION:
Always put an alignment mark for aligning the
position on bushing installation.
2) Using the ST and a press, remove the pillow ball
bushing.
ST1 20099AE020
INSTALLER & REMOVER
ST2 28099PA010
HOUSING STAND
NOTE:
Place the plate on the ST1 to use the press.
D: ASSEMBLY
1. FRONT BUSHING
Assemble each part in the reverse order of disas-
sembly.
2. REAR BUSHING
Steel front arm
1) Install the rear bushing with its longer inner cyl-
inder facing upward and the shorter facing down-
ward and protruding part rearward as shown in the
figure.
2) Align the center of rear bushing recess portion
with the aligning mark on the front arm.
(1) Put an alignment mark.
(2) Recess section
(1) Press
(2) Front arm
(3) Pillow ball bushing
(4) Plate
FS-00440
(1)
(2)
(1)
FS-00425
(1)
(2)
(3)
ST2
ST1
(4)
(1) Front arm
(2) Bushing inner cylinder
(3) Longer
(4) Shorter
(5) Protrusion portion
(1) Alignment mark
(2) Recess section
FS-00113
(2)
(1)
(3)
(4)
(5)
FS-00111
(1)
(2)
(1)
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