Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 512
DS-21
Rear Axle
DRIVE SHAFT SYSTEM
NOTE:
If it is hard to remove, use the ST.
ST1 926470000
AXLE SHAFT PULLER
ST2 28099PA110
AXLE SHAFT PULLER
PLATE
10) Remove the snap pin and nut from the front lat-
eral link.
11) Separate the rear housing and the ball joint us-
ing the puller.
12) Separate the upper arm, trailing link and rear
lateral link from the rear housing.
13) Remove the rear axle.
B: INSTALLATION
1) Temporarily tighten the rear housing to the up-
per arm.
2) Aligning with the mounting hole of the rear brake
back plate, temporarily tighten the rear hub unit
bearing to the rear housing.
CAUTION:
• Be careful not to damage the magnetic en-
coder.
• Do not get closer the tool which charged
magnetism to magnetic encoder.
3) Attach the rear drive shaft to the rear hub unit
bearing.
4) Tighten the new axle nut temporarily.
CAUTION:
Use new axle nuts.
(1) Snap pin
(2) Nut
DS-00122
ST2
ST1
(2)
(1)
RS-00189
RS-00190
(1) Magnetic encoder
(2) Rear hub unit bearing
DS-00415
DS-00251
(2)
(1)
DS-00360
DS-22
Rear Axle
DRIVE SHAFT SYSTEM
5) Attach the links to the rear housing and tighten
them to the specified torque.
CAUTION:
For parts which are not reusable, refer to COM-
PONENT. <Ref. to RS-3, COMPONENT, General
Description.>
Tightening torque:
Upper arm
80 N·m (8.16 kgf-m, 59 ft-lb)
Front lateral link
60 N·m (6.12 kgf-m, 44.3 ft-lb)
Rear lateral link
80 N·m (8.16 kgf-m, 59 ft-lb)
Trailing link
90 N·m (9.18 kgf-m, 66.4 ft-lb)
6) Tighten the four bolts of the rear housing.
Tightening torque:
65 N·m (6.63 kgf-m, 47.9 ft-lb)
7) Install the rear disc rotor.
8) Install the rear disc brake caliper on the rear
housing.
Tightening torque:
17-inch type
65 N·m (6.63 kgf-m, 47.9 ft-lb)
15-inch type
66 N·m (6.73 kgf-m, 48.7 ft-lb)
9) Install the brake hose bracket and rear ABS
wheel speed sensor.
Tightening torque:
Brake hose bracket
33 N·m (3.36 kgf-m, 24.3 ft-lb)
Rear ABS wheel speed sensor
7.5 N·m (0.76 kgf-m, 5.5 ft-lb)
10) While pressing the brake pedal, tighten the new
axle nuts to the specified torque.
CAUTION:
Do not apply weight to the rear axle before
tightening the axle nut. Doing so may damage
the hub bearing.
Tightening torque:
190 N·m (19.37 kgf-m, 140.1 ft-lb)
11) After tightening the axle nut, lock it securely.
12) Install the rear wheels.
Tightening torque:
100 N·m (10.20 kgf-m, 73.8 ft-lb)
13) Connect the battery ground terminal.
14) Inspect the wheel alignment and adjust if nec-
essary.
C: DISASSEMBLY
1. REAR HUB UNIT BEARING
1) Remove the four bolts from the rear housing,
and remove the rear hub unit bearing and back
plate.
CAUTION:
• Be careful not to damage the magnetic en-
coder.
• Do not get closer the tool which charged
magnetism to magnetic encoder.
DS-00414
(1) Magnetic encoder
(2) Rear hub unit bearing
DS-00048
DS-00414
DS-00251
(2)
(1)
DS-23
Rear Axle
DRIVE SHAFT SYSTEM
2) Disassemble the rear hub unit bearing. <Ref. to
DS-25, DISASSEMBLY, Rear Hub Unit Bearing.>
2. BUSHING
For the removal procedure of bushing, refer to
“Rear Trailing Link” in “REAR SUSPENSION”.
<Ref. to RS-11, REAR HOUSING BUSHING, DIS-
ASSEMBLY, Rear Trailing Link.>
D: ASSEMBLY
1. REAR HUB UNIT BEARING
Assemble each part in the reverse order of disas-
sembly.
Tightening torque:
Rear hub unit bearing
65 N·m (6.63 kgf-m, 47.9 ft-lb)
2. BUSHING
For the installation procedure of bushing, refer to
“Rear Trailing Link” in “REAR SUSPENSION”.
<Ref. to RS-12, REAR HOUSING BUSHING, AS-
E: INSPECTION
1) Moving the rear tire up and down by hand, check
that there is no backlash in bearing, and check that
the wheel rotates smoothly.
2) Inspect the lean of axis direction using a dial
gauge. Replace the bearing if the load range ex-
ceeds the limitation.
Service limit:
Maximum: 0.05 mm (0.0020 in)
DS-00061
DS-00062
DS-24
Rear Hub Unit Bearing
DRIVE SHAFT SYSTEM
6. Rear Hub Unit Bearing
A: REMOVAL
1) Lift up the vehicle, and then remove the rear
wheels.
2) Lift the crimped section of axle nut.
3) Remove the axle nut using a socket wrench
while depressing the brake pedal.
CAUTION:
Do not loosen the axle nut while the rear axle is
loaded. Doing so may damage the hub bearing.
4) Remove the disc brake caliper from the rear
housing, and suspend it from vehicle using a string.
5) Remove the rear disc rotor.
6) Remove the four bolts from the rear housing.
7) Remove the rear hub unit bearing.
CAUTION:
• Be careful not to damage the magnetic en-
coder.
• Do not get closer the tool which charged
magnetism to magnetic encoder.
NOTE:
If it is hard to remove, use the ST.
ST1 926470000
AXLE SHAFT PULLER
ST2 28099PA110
AXLE SHAFT PULLER
PLATE
DS-00038
FU-03358
DS-00414
(1) Magnetic encoder
(2) Rear hub unit bearing
DS-00251
(2)
(1)
DS-00360
DS-00122
ST2
ST1
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