Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. 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,

REMOVAL, Intercooler.>

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-

cooler.>

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

STI)-2, General Description.>

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-

MOVAL, Propeller Shaft.>

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-

STALLATION, Propeller Shaft.>

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

Shaft.>

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

STI)-2, General Description.>

10) Lower the vehicle.

11) Add  the  transmission  gear  oil  through  the  oil

level  gauge  hole.  <Ref.  to  5MT-22,  REPLACE-

MENT, Transmission Gear Oil.>

MT-01548

MT-01548

ST

MT-00103