Mitsubishi 380. Manual - part 471

AK202226

MB991445

AB

TRANSMISSION

AUTOMATIC TRANSMISSION OVERHAUL

23B-44

3. Use the special tools Bush remover and installer 

(MB991445) to press the differential bearing outer 
race into the torque converter housing.

AK202103

4. Install the converter housing on the transmission 

case without applying FIPG. Tighten the mounting 
bolts to the specified torque of 48 

± 6 N⋅m.

5. Remove the bolts and converter housing, and 

take out the crushed plastigage.

6. If the plastigages have not crushed, replace the 

spacer with a thicker one and repeat steps 3 to 5.

AK402081

Plastigage

Spacer

AB

7. Measure the width of the crushed plastigage at its 

widest part using a scale printed on the plastigage 
package, and then select a spacer that will 
provide the standard value.

Spacer thickness: (T3 

− 0.045 mm) to (T3 − 

0.105 mm)
T3: The crushed plastigage thickness mm

Standard value: 0.045 

− 0.105 mm

OIL PUMP

AUTOMATIC TRANSMISSION OVERHAUL

23B-45

OIL PUMP

DISASSEMBLY AND REASSEMBLY

M1233001300325

AK301599

3

4

2

1

AC

Apply automatic

transmission fluid

to all moving parts

before installation.

Disassembly steps 

>>

B

<<

1.

O-ring

2.

Seal ring

>>

A

<<

3.

Oil seal

4.

Oil pump assembly

REASSEMBLY SERVICE POINTS

>>A<< OIL SEAL INSTALLATION

AK300522AD

MD998334

1. Apply a small amount of ATF to the oil seal lip.

2. Use special tool OIl installer (MD998334) to tap 

the oil seal in the oil pump body.

>>B<< O-RING INSTALLATION
Install a new O-ring to the outer groove of the oil 
pump, and apply ATF or petroleum jelly (Vaseline) to 
the O-ring.

UNDERDRIVE CLUTCH AND INPUT SHAFT

AUTOMATIC TRANSMISSION OVERHAUL

23B-46

UNDERDRIVE CLUTCH AND INPUT SHAFT

DISASSEMBLY AND REASSEMBLY

M1233020900199

AK301600

13

10

15

15

10

12

13

11

14

11

12

14

6

8

9

8

3

2

2

3

1

1

9

5

4

4

5

7

6

7

AC

Apply automatic

transmission fluid

to all moving parts

before installation.

Disassembly steps 

1.

Snap ring

2.

Input shaft

3.

Seal ring

>>

D

<<

4.

Snap ring

>>

C

<<

5.

Clutch reaction plate

>>

C

<<

6.

Clutch disc

>>

C

<<

7.

Clutch plate

<<

A

>>

>>

B

<<

8.

Snap ring

9.

Spring retainer

>>

A

<<

10. D-ring
11. Return spring
12. Underdrive clutch piston

>>

A

<<

13. D-ring

>>

A

<<

14. D-ring
15. Underdrive clutch retainer

DISASSEMBLY SERVICE POINT

<<A>> SNAP RING REMOVAL

AK300523AC

MD998907

MD998924

1. Use the special tools to install the snap ring.

• Spring compressor (MD998907)

• Spring compressor retainer (MD998924)

2. Compress the return spring and remove the snap 

ring.

UNDERDRIVE CLUTCH AND INPUT SHAFT

AUTOMATIC TRANSMISSION OVERHAUL

23B-47

REASSEMBLY SERVICE POINTS

>>A<< D-RING INSTALLATION
1. Install a D-ring in the groove in the underdrive 

clutch retainer and piston, and in the groove in the 
outside of the spring retainer. Be careful not to 
twist or damage the D-rings.

2. Apply ATF or petroleum jelly (Vaseline) to the D-

rings.

>>B<< SNAP RING INSTALLATION

AK300523AC

MD998907

MD998924

1. Place the snap ring on top of the spring retainer, 

and then set special tool as shown in the 
illustration.

• Spring compressor (MD998907)

• Spring compressor retainer (MD998924)

2. Compress the return spring and install the snap 

ring.

>>C<< CLUTCH PLATE/CLUTCH DISC/CLUTCH 
REACTION PLATE INSTALLATION

AK301272AB

A

B

CAUTION

Immerse the clutch disc in ATF before assem-
bling it. If the clutch disc is new, soak it in ATF for 
at least two hours.
1. Assemble the four clutch plates and four clutch 

discs one on top of the other inside the underdrive 
clutch retainer. All four clutch plates should be 
assembled so that the places with no teeth 
(marked "A") are aligned with the holes in the 
retainer (marked "B").

AK301764

Clutch plates

Rounded edge

Piston 

side

Clutch discs

AC

Clutch 

reaction 

plate

2. Install the clutch reaction plate in the direction 

shown.

 

Install it the same as the clutch plates, so that the 
areas with no teeth (marked "A") are aligned with 
the retainer (marked "B").

>>D<< SNAP RING INSTALLATION

AK202311

MB991629

MD998924

AB

1. Install the snap ring into the groove of clutch 

retainer.

2. Set special tools as shown in the illustration, and 

then compress the clutch element.

• Spring compressor (MB991629)

• Spring compressor retainer (MD998924)

3. Check that the clearance between the snap ring 

and the clutch reaction plate is within the standard 
value. If not within the standard value, select a 
snap ring to achieve the standard value 
clearance.

Standard value: 1.60 

− 1.80 mm