Infiniti FX35, FX50 (S51). Manual - part 934

 

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Infiniti FX35, FX50 (S51). Manual - part 934

 

 

EM-36

< REMOVAL AND INSTALLATION >

[VQ35HR]

EXHAUST MANIFOLD

EXHAUST MANIFOLD

Exploded View

INFOID:0000000005245135

Removal and Installation

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REMOVAL

WARNING:

Perform the work when the exhaust and cooling system have completely cooled down.
NOTE:
When removing bank 1 side parts only, step 2, 5 and 10 are unnecessary.
1.

Remove engine undercover with power tool.

2.

Drain engine coolant. Refer to 

CO-8, "Draining"

.

3.

Remove engine cover with power tool. Refer to 

EM-27, "Exploded View"

.

4.

Remove air cleaner case and air duct. Refer to 

EM-29, "Exploded View"

.

5.

Remove heater pipe and water hose. Refer to 

CO-24, "Exploded View"

.

6.

Remove exhaust front tube. Refer to 

EX-5, "Exploded View"

.

7.

Disconnect heated oxygen sensor 2 harness connectors (bank 1 and bank 2) and remove harness clip.

1.

Heated oxygen sensor 2 (bank 1)

2.

Air fuel ratio sensor 1 (bank 1)

3.

Exhaust manifold cover (upper)

4.

Exhaust manifold (bank 1)

5.

Exhaust manifold cover (lower)

6.

Gasket

7.

Ring gasket

8.

Three way catalyst (bank 1)

9.

Gasket

10. Heated oxygen sensor 2 (bank 2)

11. Gasket

12.

Three way catalyst (bank 2)

13. Ring gasket

14. Exhaust manifold (bank 2)

15.

Exhaust manifold cover (lower)

16. Gasket

17. Air fuel ratio sensor 1 (bank 2)

18.

Exhaust manifold cover (upper)

Refer to 

GI-4, "Components"

 for symbols in the figure.

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EXHAUST MANIFOLD

EM-37

< REMOVAL AND INSTALLATION >

[VQ35HR]

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8.

Using heated oxygen sensor wrench [SST: KV10114400 (J-
38365)] (C), removal heated oxygen sensor 2.

9.

Remove three way catalysts (bank 1 and bank 2).

10. Disconnect steering lower joint at power steering gear assembly side, and release steering lower shaft.

11. Disconnect air fuel ratio sensor 1 harness connectors (bank 1 and bank 2) and remove harness clip.
12. Using the heated oxygen sensor wrench [SST: KV10114400 (J-

38365)] (C), remove air fuel ratio sensor 1 (bank 1 and bank 2).

CAUTION:

• Be careful not to damage air fuel ratio sensor 1.
• Discard any air fuel ratio sensor 1 which has been

dropped onto a hard surface such as a concrete floor.
Replace with a new sensor.

13. Remove exhaust manifold cover (upper) (bank 1 and bank 2).

14. Loosen mounting nuts in the reverse order as shown in the fig-

ure to remove exhaust manifold.

NOTE:
Disregard the numerical order No. 7 and 8 in removal.

15. Remove gaskets.

CAUTION:

Cover engine openings to avoid entry of foreign materials.

INSTALLATION

Note the following item, and install in the reverse order of removal.

A

:  Bank  2

B

:  Bank  1 

: Vehicle front

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A

:  Bank  2

B

:  Bank  1

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A

:  Bank  1

B

:  Bank  2

: Engine front

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EM-38

< REMOVAL AND INSTALLATION >

[VQ35HR]

EXHAUST MANIFOLD

EXHAUST MANIFOLD GASKET

• Install exhaust manifold gasket in direction shown in the figure.

(Follow same procedure for both banks.)

EXHAUST MANIFOLD

• If stud bolts were removed, install them and tighten to the specified torque below.

• Install exhaust manifold and tighten mounting nuts in numerical

order as shown in the figure.

NOTE:
Tighten nuts No. 1 and 2 in two steps. The numerical order No. 7
and 8 shows second step.

AIR FUEL RATIO SENSOR 1, HEATED OXYGEN SENSOR 2

CAUTION:

• Before installing a new sensors, clean exhaust system threads using heated oxygen sensor thread

cleaner tool (commercial service tool: J-43897-18 or J-43897-12) and apply anti-seize lubricant.

• Never over torque sensors. Doing so may cause damage to sensors, resulting in the “MIL” coming

on.

Inspection

INFOID:0000000005245137

INSPECTION AFTER REMOVAL

Surface Distortion

A

:  Bank  1

B

: Triangle press

C

:  Bank  2

: Engine front

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Tightening torque

: Refer to 

EM-36, "Exploded View"

.

A

:  Bank  1

B

:  Bank  2

: Engine front

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EXHAUST MANIFOLD

EM-39

< REMOVAL AND INSTALLATION >

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• Check the surface distortion of the exhaust manifold mating sur-

face with a straightedge (A) and a feeler gauge (B).

• If it exceeds the limit, replace exhaust manifold.

Limit

: Refer to 

EM-143, "Exhaust Manifold"

.

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