Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 422
6MT-25
General Description
MANUAL TRANSMISSION AND DIFFERENTIAL
2. GENERAL TOOL
18675AA000
DIFFERENTIAL
SIDE OIL SEAL
INSTALLER
Used for installing the differential side retainer oil
seal.
28399SA010
OIL SEAL PROTEC-
TOR
Used for protecting oil seal when installing front
drive shaft.
18657AA020
OIL SEAL
INSTALLER
Used for installing the oil seal.
18270KA020
SOCKET (E20)
Used for removing and installing the hypoid
driven gear.
TOOL NAME
REMARKS
Circuit tester
Used for measuring resistance, voltage and current.
TORX
®
bit T70
Used for removing and installing transmission gear oil drain
plug.
Depth gauge
Used for measuring the transmission end play.
ILLUSTRATION
TOOL NUMBER
DESCRIPTION
REMARKS
ST18675AA000
ST28399SA010
ST18657AA020
ST18270KA020
6MT-26
Transmission Gear Oil
MANUAL TRANSMISSION AND DIFFERENTIAL
2. Transmission Gear Oil
A: INSPECTION
1) Lift up the vehicle.
2) Remove the transmission under cover.
3) Remove the filler plug, and then check the trans-
mission gear oil.
4) Check that the transmission gear oil level is up to
the bottom of the filler plug. If the transmission gear
oil level is low, refill up to the bottom of filler plug.
5) Using a new gasket, and tighten the filler plug.
Tightening torque:
50 N·m (5.1 kgf-m, 36.9 ft-lb)
B: REPLACEMENT
1) Lift up the vehicle.
2) Remove the transmission under cover.
3) Remove the filler plug.
4) Remove the two drain plugs (oil pan side, clutch
housing side), and then drain the transmission gear
oil completely.
CAUTION:
• Immediately after running the vehicle or after
idling for a long time, the transmission gear oil
will be hot. Be careful not to receive burns.
• Be careful not to spill the transmission gear
oil on exhaust pipe to prevent it from emitting
smoke or causing fires. If transmission gear oil
is spilled on the exhaust pipe, wipe it off com-
pletely.
NOTE:
• Tighten the drain plug of the transmission gear
oil after draining the transmission gear oil.
• Always use a new gasket.
• Use TORX
®
bit T70 to remove and install the
drain plug on clutch housing side.
Tightening torque:
Oil pan side
50 N·m (5.1 kgf-m, 36.9 ft-lb)
Clutch housing side
70 N·m (7.1 kgf-m, 51.6 ft-lb)
5) Pour transmission gear oil to the bottom end of
filler plug.
NOTE:
Carefully refill transmission gear oil while checking
the level. Excessive or insufficient oil must be
avoided.
Recommended gear oil
GL-5 (75W-90) or equivalent
Transmission gear oil capacity
4.1 L (4.3 US qt, 3.6 Imp qt)
6) Check the level of the transmission gear oil.
7) Using a new gasket, and tighten the filler plug.
Tightening torque:
50 N·m (5.1 kgf-m, 36.9 ft-lb)
(A) Filler plug
(A) Filler plug
MT-01706
(A)
MT-01706
(A)
(A) Drain plug (oil pan side)
(B) Drain plug (clutch housing side)
MT-01830
(A)
(B)
6MT-27
Oil Seal
MANUAL TRANSMISSION AND DIFFERENTIAL
3. Oil Seal
A: INSPECTION
Check that there is no oil leaking from the oil seal.
If there is any deformation, hardening, wear or oth-
er malfunctions of the oil seal, perform the follow-
ing:
• Replace the oil seal.
• Inspect the propeller shaft.
B: REPLACEMENT
1) Clean the transmission exterior.
2) Drain transmission gear oil completely. <Ref. to
6MT-26, REPLACEMENT, Transmission Gear
3) Remove the rear exhaust pipe and muffler.
<Ref. to EX(STI)-13, REMOVAL, Rear Exhaust
Pipe.> <Ref. to EX(STI)-15, REMOVAL, Muffler.>
4) Remove the heat shield cover.
5) Remove the propeller shaft. <Ref. to DS-11, RE-
6) Using the ST, remove the oil seal.
ST 398527700
PULLER ASSY
7) Using the ST, install the oil seal.
NOTE:
• When grease is not applied to the oil seal lips,
apply the transmission gear oil to the oil seal lips.
• Use a new oil seal.
ST 498057300
INSTALLER
8) Install the propeller shaft. <Ref. to DS-12, IN-
9) Install the heat shield cover.
10) Install the rear exhaust pipe and muffler. <Ref.
to EX(STI)-13, INSTALLATION, Rear Exhaust
Pipe.> <Ref. to EX(STI)-15, INSTALLATION, Muf-
11) Pour in transmission gear oil and check the oil
level. <Ref. to 6MT-26, REPLACEMENT, Trans-
(A) Oil seal
MT-00451
(A)
ST
MT-00099
6MT-28
Differential Side Retainer Oil Seal
MANUAL TRANSMISSION AND DIFFERENTIAL
4. Differential Side Retainer Oil
Seal
A: INSPECTION
Check that there is no oil leaking from the differen-
tial side retainer oil seal. If there is oil leakage, per-
form the following procedures.
• Replace the oil seal.
• Check the front drive shaft.
B: REPLACEMENT
1) Lift up the vehicle.
2) Remove the front exhaust pipe and center ex-
haust pipe. <Ref. to EX(STI)-6, REMOVAL, Front
3) Drain transmission gear oil completely. <Ref. to
6MT-26, REPLACEMENT, Transmission Gear
4) Separate the front drive shaft from the transmis-
sion. <Ref. to DS-27, REMOVAL, Front Drive
5) Remove the differential side retainer oil seal by
using a flat tip screwdriver or similar tools.
6) Using the ST, install the differential side retainer
oil seal by lightly tapping with a hammer.
ST 18675AA000 DIFFERENTIAL SIDE OIL
SEAL INSTALLER
7) Apply transmission gear oil to the oil seal lips.
8) Set the ST to the side retainer.
ST 28399SA010 OIL SEAL PROTECTOR
9) Install the front drive shaft into the transmission.
NOTE:
Replace the circlip of drive shaft with a new part.
10) Install the front drive shaft into transmission, re-
move the ST and insert the drive shaft securely.
ST 28399SA010 OIL SEAL PROTECTOR
11) Install the front exhaust pipe and the center ex-
haust pipe. <Ref. to EX(STI)-6, INSTALLATION,
12) Pour transmission gear oil to the bottom end of
filler plug. <Ref. to 6MT-26, REPLACEMENT,
13) Lower the vehicle.
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