Mitsubishi Galant 9G. Manual - part 349

EXHAUST MANIFOLD

TSB Revision

INTAKE AND EXHAUST

15-16

REMOVAL AND INSTALLATION <3.8L ENGINE>

M1151003301055

<LEFT BANK>

Pre-removal and Post-installation Operation
• Under Cover Removal and Installation (Refer to GROUP 

51, Under Cover 

P.51-11

). 

• Air Duct Removal and Installation (Refer to 

P.15-4

).

AC306910

19 ± 3 N·m
14 ± 2 ft-lb

44 ± 8 N·m
33 ± 5 ft-lb

44 ± 8 N·m
33 ± 5 ft-lb

44 ± 5 N·m
33 ± 3 ft-lb

49 ± 9 N·m
37 ± 6 ft-lb

14 ± 1 N·m
120 ± 13 in-lb

1

1

2

3

4

5

6

7

8

9

10

N

N

AC 

44 ± 5 N·m
33 ± 3 ft-lb

44 ± 5 N·m
33 ± 3 ft-lb

REMOVAL STEPS

1.

LEFT HEATED OXYGEN SENSOR 
CONNECTOR

<<A>> >>A<<

2.

LEFT BANK HEATED  OXYGEN 
SENSOR (FRONT)

<<B>> >>B<<

3.

LEFT BANK HEATED  OXYGEN 
SENSOR (REAR)

4.

HEAT PROTECTOR

5.

FRONT EXHAUST PIPE 
CONNECTING BOLTS

6.

FRONT EXHAUST PIPE GASKET

7.

EXHAUST MANIFOLD STAY, LEFT 
B

8.

EXHAUST MANIFOLD

9.

EXHAUST MANIFOLD GASKET

10. EXHAUST MANIFOLD STAY,  LEFT 

A

REMOVAL STEPS (Continued)

EXHAUST MANIFOLD

TSB Revision

INTAKE AND EXHAUST

15-17

<RIGHT BANK>

Required Special Tools:

• MB991953: Oxygen Sensor Wrench

• MD998770: Oxygen Sensor Wrench

Pre-removal and Post-installation Operation
• Air Cleaner Cover and Air Intake Duct Removal and 

Installation (Refer to 

P.15-4

).

• Battery Removal and Installation

• Under Cover Removal and Installation (Refer to GROUP 

51, Under Cover 

P.51-11

). 

• Front Exhaust Pipe, Center Exhaust Pipe Removal and 

Installation (Refer to 

P.15-20

).

• Strut Tower Bar Removal and Installation (Refer to 

GROUP 42, Strut Tower Bar 

P.42-12

).

• Engine Coolant Draining and Refilling (Refer to GROUP 

14, On-vehicle Service 

− Engine Coolant Replacement 

P.14-7

).

AC308063AB

44 ± 5 N·m
33 ± 3 ft-lb

1

N

2

3

4

5

6

7

8

9

10

11

12

19 ± 3 N·m
14 ± 2 ft-lb

14 ± 1 N·m
120 ± 13 in-lb

13

N

44 ± 5 N·m
33 ± 3 ft-lb

14 ± 1 N·m
120 ± 13 in-lb

44 ± 8 N·m
33 ± 5 ft-lb

19 ± 3 N·m
14 ± 2 ft-lb

59 ± 10 N·m
44 ± 7 ft-lb

REMOVAL STEPS

1.

CENTER UNDER FLOOR HEAT 

PROTECTOR

•

STEERING GEAR AND LINKAGE 

PROTECTOR (REFER TO GROUP 37, 

POWERSTEERING GEAR BOX AND 

LINKAGE 

P.37-33

)

2.

FRONT UNDER FLOOR HEAT 

PROTECTOR

3.

EXHAUST MANIFOLD STAY, RIGHT B

4.

RIGHT BANK HEATED OXYGEN 

SENSOR (FRONT) CONNECTOR

5.

RIGHT BANK HEATED OXYGEN 

SENSOR (REAR) CONNECTOR

<<A>>

>>A<<

6.

RIGHT BANK HEATED OXYGEN 

SENSOR (FRONT)

<<A>>

>>A<<

7.

RIGHT BANK HEATED OXYGEN 

SENSOR (REAR)

8.

EGR PIPE

9.

EGR PIPE GASKET

10.

UPPER HEAT PROTECTOR

11.

LOWER HEAT PROTECTOR

12.

EXHAUST MANIFOLD

13.

EXHAUST MANIFOLD GASKET

REMOVAL STEPS (Continued)

EXHAUST MANIFOLD

TSB Revision

INTAKE AND EXHAUST

15-18

REMOVAL SERVICE POINTS

.

<<A>> LEFT BANK HEATED OXYGEN SENSOR 
(FRONT)/RIGHT BANK HEATED OXYGEN SEN-
SOR (FRONT)/RIGHT BANK HEATED OXYGEN 
SENSOR (REAR) REMOVAL

Use special tool MD998770 to remove the heated oxygen sen-
sor.

.

<<B>> LEFT BANK HEATED OXYGEN SENSOR 
(REAR) REMOVAL

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

INSTALLATION SERVICE POINTS

.

>>A<< RIGHT BANK HEATED OXYGEN SENSOR 
(REAR)/RIGHT BANK HEATED OXYGEN SENSOR 
(FRONT)/LEFT BANK HEATED OXYGEN SENSOR 
(FRONT) INSTALLATION

Use special tool MD998770 to install the heated oxygen sen-
sor.

.

ACX02426 AB

MD998770

AC301966

AC

HEATED OXYGEN 
SENSOR

MB991953

ACX02426 AB

MD998770

EXHAUST MANIFOLD

TSB Revision

INTAKE AND EXHAUST

15-19

>>B<< LEFT BANK HEATED OXYGEN SENSOR 
(REAR) INSTALLATION

Use special tool MB991953 to install the heated oxygen sensor.

INSPECTION

M1151003400587

Check the following points; replace the part if a problem is 
found.

.

Exhaust Manifold Check

1. Check for damage or cracking of any part.
2. Using a straight edge and a feeler gauge, check for 

distortion of the cylinder head installation surface.

Standard value: 0.15 mm (0.006 inch) or less 
Limit: 0.20 mm (0.008 inch)

AC301966

AC

HEATED OXYGEN 
SENSOR

MB991953