Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 493
DI-17
General Description
DIFFERENTIALS
2. GENERAL TOOL
41399FG061
SPECIAL TOOL
RING
• Used for removing and installing the rear dif-
ferential mount bushing.
• For combination of tools for removal and instal-
lation, refer to “SPECIAL TOOL ASSY
(41399FG001)”.
41399FG070
SPECIAL TOOL
NUT
• Used for removing and installing the rear dif-
ferential mount bushing.
• For combination of tools for removal and instal-
lation, refer to “SPECIAL TOOL ASSY
(41399FG001)”.
41399FG080
SPECIAL TOOL
BEARING
• Used for removing and installing the rear dif-
ferential mount bushing.
• For combination of tools for removal and instal-
lation, refer to “SPECIAL TOOL ASSY
(41399FG001)”.
41399FG091
SPECIAL TOOL
SHAFT
• Used for removing and installing the rear dif-
ferential mount bushing.
• For combination of tools for removal and instal-
lation, refer to “SPECIAL TOOL ASSY
(41399FG001)”.
TOOL NAME
REMARKS
Transmission jack
Used for removing and installing the rear differential.
Puller
Used for removing the side retainer.
Thickness gauge
Used for measuring clearance.
ILLUSTRATION
TOOL NUMBER
DESCRIPTION
REMARKS
ST41399FG061
ST41399FG070
ST41399FG080
ST41399FG091
DI-18
Differential Gear Oil
DIFFERENTIALS
2. Differential Gear Oil
A: INSPECTION
1) Disconnect the ground cable from battery.
2) Lift up the vehicle.
3) Disconnect the oil temperature switch connec-
tor. (T-type (H3))
4) Remove the filler plug or the oil temperature
switch, and then check the gear oil. Replace the
gear oil if it is contaminated, deteriorated or cloudy.
<Ref. to DI-19, REPLACEMENT, Differential Gear
Oil.>
NOTE:
Remove the oil temperature switch and adapter as
a unit.
5) Check that the gear oil level is within –5 mm (–0.2
in) from the bottom of the filler plug hole or of the oil
temperature switch hole. If the level is low, confirm
that there is no oil leakage and refill up to the bottom
of filler plug hole or the oil temperature switch hole.
• T-type (B2)
• T-type (H3)
6) Install the filler plug or the oil temperature switch.
NOTE:
• For the T-type (B2), apply liquid gasket to the
drain plug.
• For T-type (H3), use a new gasket.
• Install the oil temperature switch and adapter as
a unit.
Liquid gasket:
THREE BOND 1105 (Part No. 004403010) or
equivalent
Tightening torque:
T-type (B2)
49 N·m (5.0 kgf-m, 36.1 ft-lb)
T-type (H3)
60 N·m (6.1 kgf-m, 44.3 ft-lb)
7) Connect the oil temperature switch connector.
(T-type (H3))
8) Lower the vehicle.
9) Connect the battery ground terminal.
(A) Oil temperature switch connector
(A) Filler plug
DI-00749
(A)
DI-00711
(A)
(A) Oil temperature switch
(A) Oil temperature switch connector
DI-00750
(A)
DI-00749
(A)
DI-19
Differential Gear Oil
DIFFERENTIALS
B: REPLACEMENT
CAUTION:
• Gear oil is extremely hot just after driving. Be
wary of receiving burns.
• Be careful not to spill the differential gear oil
on exhaust pipe. If gear oil is spilled, wipe it off
completely.
1) Disconnect the ground cable from battery.
2) Lift up the vehicle.
3) Disconnect the oil temperature switch connec-
tor. (T-type (H3))
4) Remove the drain plug and filler plug or the oil
temperature switch, and drain the gear oil.
NOTE:
Remove the oil temperature switch and adapter as
a unit.
• T-type (B2)
• T-type (H3)
5) Tighten the drain plug.
NOTE:
• For the T-type (B2), apply liquid gasket to the
drain plug.
• For T-type (H3), use a new gasket.
Liquid gasket:
THREE BOND 1105 (Part No. 004403010) or
equivalent
Tightening torque:
T-type (B2)
49 N·m (5.0 kgf-m, 36.1 ft-lb)
T-type (H3)
60 N·m (6.1 kgf-m, 44.3 ft-lb)
6) Fill the differential carrier with gear oil to the bot-
tom of filler plug hole or the oil temperature switch
hole.
NOTE:
Carefully refill gear oil while watching the level. Ex-
cessive or insufficient oil must be avoided.
Recommended gear oil:
<Ref. to DI-2, SPECIFICATION, General De-
scription.>
Oil capacity:
T-type (H3)
1.0 L (1.1 US qt, 0.9 Imp qt)
T-type (B2)
0.8 L (0.8 US qt, 0.7 Imp qt)
(A) Oil temperature switch connector
(A) Filler plug
(B) Drain plug
DI-00749
(A)
DI-00522
(A)
(B)
(A) Oil temperature switch
(B) Drain plug
DI-00593
(A)
(B)
DI-20
Differential Gear Oil
DIFFERENTIALS
• T-type (B2)
• T-type (H3)
7) Install the filler plug or the oil temperature switch.
NOTE:
• For the T-type (B2), apply liquid gasket to the
drain plug.
• For T-type (H3), use a new gasket.
• Install the oil temperature switch and adapter as
a unit.
Liquid gasket:
THREE BOND 1105 (Part No. 004403010) or
equivalent
Tightening torque:
T-type (B2)
49 N·m (5.0 kgf-m, 36.1 ft-lb)
T-type (H3)
60 N·m (6.1 kgf-m, 44.3 ft-lb)
8) Connect the oil temperature switch connector.
(T-type (H3))
9) Lower the vehicle.
10) Connect the battery ground terminal.
(A) Filler plug
(B) Drain plug
(A) Oil temperature switch
(B) Drain plug
DI-00521
(A)
(B)
DI-00531
(A)
(B)
(A) Oil temperature switch connector
DI-00749
(A)
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