Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual - part 423

6MT-29

Transmission Mounting System

MANUAL TRANSMISSION AND DIFFERENTIAL

5. Transmission Mounting Sys-

tem

A: REMOVAL

1. PITCHING STOPPER

1) Disconnect the ground cable from battery.

2) Remove  the  intercooler.  <Ref.  to  IN(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 transmission under cover.

4) Remove  the  center  exhaust  pipe.  <Ref.  to

EX(STI)-8, REMOVAL, Center Exhaust Pipe.>

5) Remove  the  rear  exhaust  pipe  and  muffler.

<Ref.  to  EX(STI)-13,  REMOVAL,  Rear  Exhaust

Pipe.> <Ref. to EX(STI)-15, REMOVAL, Muffler.>

6) Remove the heat shield cover.

7) Set the transmission jack under the transmission

body.
CAUTION:

Always  support  the  transmission  case  with  a

transmission jack.

8) Remove the rear crossmember.

9) 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(STI)-13,  IN-

STALLATION, Intercooler.>

3) Connect the ground cable to battery.

2. CROSSMEMBER AND CUSHION RUB-

BER

1) Install the transmission cushion rubber.
Tightening torque:

35 N·m (3.6 kgf-m, 25.8 ft-lb)

2) Install the crossmember.
Tightening torque:

T1: 35 N·m (3.6 kgf-m, 25.8 ft-lb)

T2: 70 N·m (7.1 kgf-m, 51.6 ft-lb)

T3: 140 N·m (14.3 kgf-m, 103 ft-lb)

3) Remove the transmission jack.

4) Install the heat shield cover.

5) Install the rear exhaust pipe and muffler. <Ref. to

EX(STI)-13, INSTALLATION, Rear Exhaust Pipe.>

<Ref. to EX(STI)-15, INSTALLATION, Muffler.>

6) Install the center exhaust pipe. <Ref. to EX(STI)-

9, INSTALLATION, Center Exhaust Pipe.>

MT-01938

MT-01939

MT-01301

T1

T2

MT-01940

T2

T3

T3

T2

T1

6MT-30

Transmission Mounting System

MANUAL TRANSMISSION AND DIFFERENTIAL

C: INSPECTION

Perform  the  following  inspection  procedures  and

repair or replace 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 is not stiff, cracked,

or otherwise damaged.

6MT-31

Manual Transmission Assembly

MANUAL TRANSMISSION AND DIFFERENTIAL

6. Manual Transmission As-

sembly

A: REMOVAL

1) Change the bolt installation position from (A) to

(B), then open the front hood completely.
Tightening torque:

7.5 N·m (0.8 kgf-m, 5.5 ft-lb)

2) Disconnect the ground cable from battery.

3) Remove  the  intercooler.  <Ref.  to  IN(STI)-12,

REMOVAL, Intercooler.>

4) Disconnect  the  following  harness  connectors,

and then remove the engine hanger rear.

5) Remove  the  secondary  air  combination  valve.

<Ref.  to  EC(STI)-29,  SECONDARY  AIR  COMBI-

NATION  VALVE  LH,  REMOVAL,  Secondary  Air

Combination Valve.>

6) Disconnect the transmission radio ground termi-

nal.

7) Remove the starter assembly. <Ref. to SC(STI)-

8, REMOVAL, Starter.>

8) Remove  the  operating  cylinder  from  the  trans-

mission.
NOTE:

Hang the removed operating cylinder with a piece

of wire.

9) Remove the return spring from the release fork.

10) Remove the pitching stopper. <Ref. to 6MT-29,

PITCHING  STOPPER,  REMOVAL,  Transmission

Mounting System.>

11) Remove  the  pitching  stopper  bracket,  return

spring bracket, and transmission radio ground ca-

ble.

(A) Front oxygen (A/F) sensor connector
(B) Rear oxygen sensor connector

(C) Neutral position switch backup light switch con-

nector

ME-03614

(A)

(B)

(A)

(B)

MT-01740

(A)

(B)

(C)

MT-01266

CL-00445

MT-02302

6MT-32

Manual Transmission Assembly

MANUAL TRANSMISSION AND DIFFERENTIAL

12) Set the ST.

ST1 41099AA010

ENGINE SUPPORT 

BRACKET

ST2 41099AA020

ENGINE SUPPORT

13) Remove the clutch release shaft.

(1) Remove the plug using a hexagon wrench.

(2) Attach a 6 mm (0.24 in) bolt to the release

shaft, and pull out the release shaft.

(3) Lift  the  release  fork,  and  remove  from  the

claw  of  the  release  bearing.  Pull  the  release

fork to the engine side, and make it so that it

moves freely.

14) Remove  the  bolts  which  hold  upper  side  of

transmission to engine.

15) Remove the front wheels.

16) Lift  up  the  vehicle,  and  remove  the  transmis-

sion under cover.

17) Drain transmission gear oil completely. <Ref. to

6MT-26,  REPLACEMENT,  Transmission  Gear

Oil.>

18) Remove  the  center  exhaust  pipe.  <Ref.  to

EX(STI)-8, REMOVAL, Center Exhaust Pipe.>

19) Remove the heat shield cover.

20) Remove  the  propeller  shaft.  <Ref.  to  DS-11,

REMOVAL, Propeller Shaft.>

21) Remove the front stabilizer link.

22) Remove  the  ball  joint  of  front  arm  from  the

housing.

23) Remove the front drive shaft. <Ref. to DS-27,

REMOVAL, Front Drive Shaft.>

24) Set the transmission jack under the transmis-

sion, and remove the front crossmember and rear

crossmember.

MT-01526

ST2

ST1

MT-01524

FS-00117

FS-00106

MT-01264