Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual — part 416

MANUAL TRANSMISSION AND

DIFFERENTIAL

6MT

Page

1.

General Description . . . . . . . . . . . . . . . . . . . . ...2

2.

Transmission Gear Oil . . . . . . . . . . . . . . . . . . . .26

3.

Oil Seal . . . . . . . . . . . . . . . . . . . . . . . . . .27

4.

Differential Side Retainer Oil Seal . . . . . . . . . . . . . . . 28

5.

Transmission Mounting System . . . . . . . . . . . . . . . ...29

6.

Manual Transmission Assembly . . . . . . . . . . . . . . . ..31

7.

Preparation for Overhaul . . . . . . . . . . . . . . . . . . ..37

8.

Air Breather Hose . . . . . . . . . . . . . . . . . . . . . .38

9.

Back-up Light Switch . . . . . . . . . . . . . . . . . . . . 39

10.

Neutral Position Switch . . . . . . . . . . . . . . . . . . . 41

11.

Extension Case . . . . . . . . . . . . . . . . . . . . . . 43

12.

Reverse Check System . . . . . . . . . . . . . . . . . . . 50

13.

Transfer Drive Gear . . . . . . . . . . . . . . . . . . . . .53

14.

Transfer Driven Gear . . . . . . . . . . . . . . . . . . . ...55

15.

Center Differential . . . . . . . . . . . . . . . . . . . . . 57

16.

Transmission Case . . . . . . . . . . . . . . . . . . . . ..58

17.

Main Shaft Assembly . . . . . . . . . . . . . . . . . . . ...65

18.

Driven Gear Assembly . . . . . . . . . . . . . . . . . . . .80

19.

Reverse Idler Gear Assembly . . . . . . . . . . . . . . . . ..89

20.

Drive Pinion Shaft Assembly . . . . . . . . . . . . . . . . . 94

21.

Front Differential Assembly . . . . . . . . . . . . . . . . . 100

22.

Shifter Fork and Rod . . . . . . . . . . . . . . . . . . . ..107

23.

Clutch Housing . . . . . . . . . . . . . . . . . . . . . ...121

24.

Driver’s Control Center Differential Control Module . . . . . . . ...123

25.

General Diagnostic Table . . . . . . . . . . . . . . . . . ...124

6MT-2

General Description

MANUAL TRANSMISSION AND DIFFERENTIAL

1. General Description

A: SPECIFICATION

1. MANUAL TRANSMISSION AND FRONT DIFFERENTIAL

2. TRANSMISSION GEAR OIL

Recommended oil:

GL-5 (75W-90) or equivalent

Type

6-forward speeds and 1-reverse

Transmission gear ratio

1st

3.636

2nd

2.235

3rd

1.521

4th

1.137

5th

0.971

6th

0.756

Reverse

3.545

Front reduction
gear

Final

Type of gear

Hypoid

Gear ratio

3.900

Rear reduction
gear

Transfer

Type of gear

Helical

Gear ratio

1.103

Final

Type of gear

Hypoid

Gear ratio

3.545

Front differential

Type and number of gear

Planetary gear (pinion gear: 8, gear: 2)

LSD type

Helical

Center differential Type and number of gear

Planetary gear

(Internal gear: 1, pinion gear: 6, sun gear: 1, and solenoid compression

variable control multiplate clutch)

Transmission gear oil

GL-5

Transmission gear oil capacity

4.1 L (4.3 US qt, 3.6 Imp qt)

6MT-3

General Description

MANUAL TRANSMISSION AND DIFFERENTIAL

B: COMPONENT

1. CLUTCH HOUSING

(1)

Gasket

(7)

Oil seal

Tightening torque: N·m (kgf-m, ft-lb)

(2)

Plug

(8)

Clutch release bearing guide

T1: 6.4 (0.7, 4.7)

(3)

Pitching stopper bracket

(9)

Return spring bracket

T2: 41 (4.2, 30.2)

(4)

Clip

(10) Plug

T3: 50 (5.1, 36.9)

(5)

Clutch housing

(11) Drain plug

T4: 70 (7.1, 51.6)

(6)

Gasket

(12) Transmission radio ground cable

T5: 46 (4.7, 33.9)

MT-02307

(5)

(6)

(7)

(8)

T3

T4

T1

(4)

(3)

(2)

(9)

T2

(12)

(1)

(10)

(11)

T5

6MT-4

General Description

MANUAL TRANSMISSION AND DIFFERENTIAL

2. ADAPTER PLATE

(1)

Breather hose

(7)

O-ring

Tightening torque: N·m (kgf-m, ft-lb)

(2)

Check plug

(8)

Checking spring

T1: 18 (1.8, 13.3)

(3)

O-ring

(9)

Check ball

T2: 25 (2.5, 18.4)

(4)

Checking spring

(10) Oil guide A

T3: 50 (5.1, 36.9)

(5)

Plunger

(11) Oil guide B

(6)

Check plug

(12) Adapter plate

MT-02308

(2)

(3)

(1)

(4)

(6)

(5)

(7)

(8)

(9)

(12)

T2

T1

T3

T2

T1

(11)

T1

(10)