Mitsubishi Evolution X. Manual - part 337

EXHAUST MANIFOLD AND TURBOCHARGER

TSB Revision

INTAKE AND EXHAUST

15-23

INSPECTION

M1151009400132

.

EXHAUST MANIFOLD CHECK

1. Check the exhaust manifold for damage and cracks, and 

replace it if necessary.

2. Using a straight edge and a thickness gauge, check for 

distortion of the cylinder head and turbocharger installation 
surface. If it exceeds the limit value, replace it.

Limit <Cylinder head assembly side>: 0.70 mm 

(0.028 inch)

Limit <Turbocharger assembly side>: 0.40 mm (0.016 

inch)

.

TURBOCHARGER ASSEMBLY CHECK

1. Visually check the turbine wheel and the compressor wheel 

for cracking or other damage.

2. Check whether the turbine wheel and the compressor wheel 

can be easily turned by hand.

3. Check for oil leakage from the turbocharger assembly.
4. Check whether or not the turbocharger waste gate 

regulating valve remains open. If any problem is found, 
replace the part after disassembly.

EXHAUST PIPE AND MAIN MUFFLER

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INTAKE AND EXHAUST

15-24

EXHAUST PIPE AND MAIN MUFFLER

REMOVAL AND INSTALLATION

M1151008701854

AC708975

41 ± 10 N·m
30 ± 7 ft-lb

1

2

3

44 ± 5 N·m
33 ± 3 ft-lb

5

6

8

44 ± 5 N·m
33 ± 3 ft-lb

9

10

N

11

12

12

13

14

N

15

16

N

17

18

19

N

4

7

20

N

5.0 ± 2.0 N·m
45 ± 17 in-lb 

20

N

20

N

5.0 ± 2.0 N·m
45 ± 17 in-lb 

21

23

N

23

N

24

25

22

7.0 ± 3.0 N·m
62 ± 26 in-lb 

9.5 ± 3.5 N·m
85 ± 30 in-lb 

5.0 ± 2.0 N·m
45 ± 17 in-lb 

41 ± 10 N·m
30 ± 7 ft-lb

59 ± 10 N·m
44 ± 7 ft-lb

75 ± 19 N·m
56 ± 14 ft-lb

9.5 ± 3.5 N·m
85 ± 30 in-lb 

5.0 ± 2.0 N·m
45 ± 17 in-lb 

AB

Exhaust main muffler and rear 
floor panel heat protector 
removal steps 

1.

Exhaust main muffler

10. Seal ring
11. Exhaust muffler hanger
12. Exhaust tail pipe diffuser
13. Rear floor panel heat protector 

Center exhaust pipe removal 
steps 

2.

Center exhaust pipe

10. Seal ring
14. Exhaust pipe gasket
15. Exhaust muffler hanger

Catalytic converter removal 
steps 

3.

Harness cover

4.

Heated oxygen sensor (rear) 
connector

<<

A

>>

>>

B

<<

5.

Heated oxygen sensor (rear) 

6.

Catalytic converter

14. Exhaust pipe gasket
16. Exhaust pipe gasket
17. Exhaust muffler hanger
18. Exhaust muffler hanger protector

Front exhaust pipe removal 
steps 

•

Cowl side trim (Refer to GROUP 
52A, Trims 

P.52A-11

).

•

Footrest

•

Floor console side cover (Refer to 
GROUP 52A, Front Floor 
Console Assembly 

P.52A-9

).

•

Turn up the passenger side floor 
carpet.

•

Front floor backbone brace (Refer 
to GROUP 42, Loose Panel 

P.42A-192

).

7.

Heated oxygen sensor (front) 
connector

<<

A

>>

>>

B

<<

8.

Heated oxygen sensor (front)

9.

Front exhaust pipe

16. Exhaust pipe gasket
19. Seal ring

Front floor panel front heat 
protector and front floor panel 
rear heat protector removal 
steps 

2.

Center exhaust pipe

3.

Harness cover

EXHAUST PIPE AND MAIN MUFFLER

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INTAKE AND EXHAUST

15-25

Required Special Tool:

• MB991953: Oxygen Sensor Wrench

REMOVAL SERVICE POINTS

.

<<A>> HEATED OXYGEN SENSOR REMOVAL

AC301966

AG

MB991953

Heated oxygen 
sensor

Use special tool MB991953 to remove the heated oxygen sen-
sor.

.

4.

Heated oxygen sensor (rear) 
connector

6.

Catalytic converter

•

Cowl side trim (Refer to GROUP 
52A, Trims 

P.52A-11

).

•

Footrest

•

Floor console side cover (Refer to 
GROUP 52A, Front Floor 
Console Assembly 

P.52A-9

).

•

Turn up the passenger side floor 
carpet.

•

Front floor backbone brace (Refer 
to GROUP 42, Loose Panel 

P.42A-192

).

7.

Heated oxygen sensor (front) 
connector

9.

Front exhaust pipe

10. Seal ring
14. Exhaust pipe gasket
16. Exhaust pipe gasket
19. Seal ring
•

Propeller shaft assembly (Refer 
to GROUP 25, Propeller Shaft 

P.25-6

).

<<

B

>>

>>

A

<<

20. Rivet

<<

B

>>

>>

A

<<

21. Front floor rear panel heat 

protector

22. Dash panel heat protector

<<

B

>>

>>

A

<<

23. Rivet
24 Heated oxygen sensor clip

<<

B

>>

>>

A

<<

25. Front floor front panel heat 

protector

Front floor panel front heat 
protector and front floor panel 
rear heat protector removal 
steps (Continued)

EXHAUST PIPE AND MAIN MUFFLER

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INTAKE AND EXHAUST

15-26

<<B>> RIVET/FRONT FLOOR REAR PANEL HEAT 
PROTECTOR/FRONT FLOOR FRONT PANEL 
HEAT PROTECTOR REMOVAL

CAUTION

Be careful not to score the heat protector by drill.

AC301909AD

Heat
protector

Drill

Rivet

1. Use a 6.0 / diameter / mm drill to make a hole in the flange 

of rivet as shown.

2. Break the rivet, and remove the rivet and heat protector.

INSTALLATION SERVICE POINTS

.

>>A<< RIVET/FRONT FLOOR FRONT PANEL 
HEAT PROTECTOR/FRONT FLOOR REAR PANEL 
HEAT PROTECTOR/RIVET INSTALLATION

Use a riveter to tighten the rivet by the following procedure.

AC301910 AD

Heat protector

Rivet

Part A

Riveter

Rivet

Part A

1. Insert part A of rivet into the riveter, and insert the rivet into 

the assembling area.

2. Operate the tool's handle while pushing the flange surface of 

rivet by riveter. Part A of rivet is cut and the rivet is tightened.

.

>>B<< HEATED OXYGEN SENSOR 
INSTALLATION

AC301966

AG

MB991953

Heated oxygen 
sensor

Tighten the heated oxygen sensor to the specified torque by 
using special tool MB991953.

Tightening torque: 44 

± 5 N⋅ m (33 ± 3 ft-lb)