Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 402
5MT-29
Transmission Mounting System
MANUAL TRANSMISSION AND DIFFERENTIAL
4. Transmission Mounting Sys-
tem
A: REMOVAL
1. PITCHING STOPPER
1) Disconnect the ground cable from battery.
2) Remove the intercooler. <Ref. to IN(w/o STI)-12,
3) Remove the pitching stopper.
2. CROSSMEMBER AND CUSHION RUB-
BER
1) Disconnect the ground cable from battery.
2) Lift up the vehicle.
3) Remove the center exhaust pipe. <Ref. to EX(w/
o STI)-2, General Description.>
4) Remove the rear exhaust pipe and muffler.
<Ref. to EX(w/o STI)-2, General Description.>
5) Remove the heat shield cover.
6) Set the transmission jack under the transmission
case.
CAUTION:
Always support the transmission case with a
transmission jack.
7) Remove the front crossmember and the rear
crossmember.
8) Remove the transmission cushion rubber.
B: INSTALLATION
1. PITCHING STOPPER
1) Install the pitching stopper.
Tightening torque:
T1: 50 N·m (5.1 kgf-m, 36.9 ft-lb)
T2: 58 N·m (5.9 kgf-m, 42.8 ft-lb)
2) Install the intercooler.
<Ref. to IN(w/o STI)-12, INSTALLATION, Inter-
3) Connect the battery ground terminal.
MT-00069
MT-01660
MT-01851
MT-00085
T2
T1
5MT-30
Transmission Mounting System
MANUAL TRANSMISSION AND DIFFERENTIAL
2. CROSSMEMBER AND CUSHION RUB-
BER
1) Install the transmission cushion rubber to the
transmission, and tighten the bolt (A).
2) Install the transmission cushion rubber to the
center crossmember, and tighten the nut (B).
Tightening torque:
Bolt (A)
35 N·m (3.6 kgf-m, 25.8 ft-lb)
Nut (B)
35 N·m (3.6 kgf-m, 25.8 ft-lb)
3) Install the front crossmember and rear cross-
member.
Tightening torque:
T1: 70 N·m (7.1 kgf-m, 51.6 ft-lb)
T2: 140 N·m (14.3 kgf-m, 103.3 ft-lb)
4) Remove the transmission jack.
5) Install the heat shield cover. <Ref. to EI-74, IN-
STALLATION, Heat Shield Cover.>
6) Install the center exhaust pipe. <Ref. to EX(w/o
7) Install the rear exhaust pipe and muffler. <Ref. to
EX(w/o STI)-2, General Description.>
8) Lower the vehicle.
9) Connect the battery ground terminal.
C: INSPECTION
Check the following; repair or replace the faulty
parts.
1. PITCHING STOPPER
Check the pitching stopper for bends or damage.
Check that the rubber is not stiff, cracked or other-
wise damaged.
2. CROSSMEMBER AND CUSHION RUB-
BER
Check the crossmember for bending or damage.
Check that the cushion rubber does not have hard-
ening, cracks or other damages.
MT-01676
(A)
(A)
(B)
MT-01672
T 1
T 1
T 2
T 2
5MT-31
Oil Seal
MANUAL TRANSMISSION AND DIFFERENTIAL
5. Oil Seal
A: INSPECTION
Check for leakage of transmission gear oil from the
oil seal. If there is oil leakage, replace the oil seal
with the new part and check the propeller shaft.
B: REPLACEMENT
1) Clean the transmission exterior.
2) Using the TORX
®
bit T70, remove the drain
plug, and drain the transmission gear oil complete-
ly.
3) Tighten the drain plug using TORX
®
bit T70.
NOTE:
Use a new gasket.
Tightening torque:
44 N·m (4.5 kgf-m, 32.5 ft-lb) (Aluminum gas-
ket silver)
70 N·m (7.1 kgf-m, 51.6 ft-lb) (Copper gasket
brown)
70 N·m (7.1 kgf-m, 51.6 ft-lb) (Metal gasket
black)
4) Remove the rear exhaust pipe and muffler.
<Ref. to EX(w/o STI)-2, General Description.>
5) Remove the heat shield cover.
6) Remove the propeller shaft. <Ref. to DS-11, RE-
7) Using the ST, remove the oil seal.
ST 398527700
PULLER ASSY
8) 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
9) Install the propeller shaft. <Ref. to DS-12, IN-
10) Install the heat shield cover. <Ref. to EI-74, IN-
STALLATION, Heat Shield Cover.>
11) Install the rear exhaust pipe and muffler. <Ref.
to EX(w/o STI)-2, General Description.>
12) Pour in transmission gear oil and check the oil
level. <Ref. to 5MT-22, Transmission Gear Oil.>
MT-01548
MT-01660
(A) Oil seal
MT-00098
(A)
ST
MT-01299
ST
5MT-32
Differential Side Retainer Oil Seal
MANUAL TRANSMISSION AND DIFFERENTIAL
6. Differential Side Retainer Oil
Seal
A: INSPECTION
Check for leakage of gear oil from differential side
retainer oil seal part. If there is oil leakage, replace
the oil seal with the new part and check the drive
shaft.
B: REPLACEMENT
1) Lift up the vehicle.
2) Remove the transmission gear oil drain plug us-
ing TORX
®
bit T70, and drain the transmission
gear oil completely.
3) Replace the gasket with a new part and tighten
the drain plug using the TORX
®
bit T70.
Tightening torque:
44 N·m (4.5 kgf-m, 32.5 ft-lb) (aluminum gas-
ket, silver)
70 N·m (7.1 kgf-m, 51.6 ft-lb) (copper gasket,
brown)
70 N·m (7.1 kgf-m, 51.6 ft-lb) (metal gasket,
black)
4) Remove the center exhaust pipe. <Ref. to EX(w/
o STI)-2, General Description.>
5) Separate the front drive shaft from the transmis-
sion. <Ref. to DS-27, REMOVAL, Front Drive
6) Remove the differential side retainer oil seal.
NOTE:
• Be sure to replace the differential side retainer oil
seal whenever the front drive shaft is removed from
the transmission.
• Use the ST 398527700 PULLER ASSY to re-
move the oil seal. If removing the oil seal with a flat
tip screwdriver, be careful not to scratch the differ-
ential side retainer.
7) Using the ST, install the differential side retainer
oil seal by lightly tapping with a plastic hammer.
ST 18675AA000 DIFFERENTIAL SIDE OIL
SEAL INSTALLER
CAUTION:
• Apply transmission gear oil to the oil seal
lips, and install the oil seal while being careful
not to deform the lip.
• Check the identification marks (R, L) during
the installation so as not to mix up the oil seal
RH and LH.
NOTE:
Use a new oil seal.
8) Install the front drive shaft. <Ref. to DS-27, IN-
STALLATION, Front Drive Shaft.>
ST 28399SA010 OIL SEAL PROTECTOR
9) Install the center exhaust pipe. <Ref. to EX(w/o
10) Lower the vehicle.
11) Add the transmission gear oil through the oil
level gauge hole. <Ref. to 5MT-22, REPLACE-
MT-01548
MT-01548
ST
MT-00103
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