Infiniti G37 Coupe. Manual - part 614

INTAKE MANIFOLD

EM-31

< ON-VEHICLE REPAIR >

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INTAKE MANIFOLD

Exploded View

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Removal and Installation

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REMOVAL

1.

Release fuel pressure. Refer to 

EC-601, "Inspection"

.

2.

Remove intake manifold collector. Refer to 

EM-28, "Exploded View"

.

3.

Remove fuel tube and fuel injector assembly. Refer to 

EM-36, "Exploded View"

.

4.

Loosen mounting bolts in reverse order as shown in the figure to
remove intake manifold with power tool.

CAUTION:

• Cover engine openings to avoid entry of foreign materi-

als.

• Put a mark on the intake manifold and the cylinder head

with paint before removal because they need to be
installed in the specified direction. 

• Loosen mounting bolts from the inside of manifold to the

outside.

5.

Remove gaskets.

INSTALLATION

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

INTAKE MANIFOLD

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

1.

Intake manifold

2.

Gasket

A.

Refer to 

EM-31

Refer to 

GI-4, "Components"

 for symbols in the figure.

JPBIA1350GB

: Engine front

JPBIA1352ZZ

: 10.8 N·m (1.1 kg-m, 8 ft-lb)

EM-32

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INTAKE MANIFOLD

• Tighten all mounting bolts to the specified torque in two or more

steps in numerical order as shown in the figure.

CAUTION:

• Install intake manifold with the marks (put on the intake

manifold and the cylinder head before removal) aligned.

• Tighten mounting bolts from the outside of manifold to the

inside.

Inspection

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INSPECTION AFTER REMOVAL

Surface Distortion

• Check the surface distortion of the intake manifold mating surface

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

• If it exceeds the limit, replace intake manifold.

: Engine front

1st step:

: 7.4 N·m (0.75 kg-m, 5 ft-lb)

2nd step and after:

: 25.5 N·m (2.6 kg-m, 19 ft-lb)

JPBIA1352ZZ

Limit

: Refer to 

EM-139, "Intake Manifold"

.

JPBIA1348ZZ

EXHAUST MANIFOLD

EM-33

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EXHAUST MANIFOLD

Exploded View

INFOID:0000000001547588

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, steps 1, 4 and 7 are unnecessary.
1.

Drain engine coolant. Refer to 

CO-8, "Draining"

.

2.

Remove engine cover with power tool. Refer to 

EM-28, "Exploded View"

.

3.

Remove air cleaner case and air duct (RH and LH). Refer to 

EM-26, "Exploded View"

.

4.

Remove water pipe and water hose. Refer to 

CO-24, "Exploded View"

.

5.

Remove engine undercover with power tool.

6.

Remove exhaust front tube and three way catalysts (bank 1 and bank 2). Refer to 

EX-5, "Exploded View"

.

7.

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

1.

Heated oxygen sensor (bank 1)

2.

Air fuel ratio sensor (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 (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 (bank 2)

18.

Exhaust manifold cover (upper)

Refer to 

GI-4, "Components"

 for symbols in the figure.

JPBIA1355GB

EM-34

< ON-VEHICLE REPAIR >

EXHAUST MANIFOLD

8.

Disconnect air fuel ratio sensor (bank 1 and bank 2) harness connectors and remove harness clip.

9.

Using the heated oxygen sensor wrench [SST: KV10114400
(J38365)] (C), remove air fuel ratio sensor (bank 1 and bank 2).

CAUTION:

• Be careful not to damage air fuel ratio sensor.
• Discard any air fuel ratio sensor that has been dropped

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

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

11. 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.

12. Remove gaskets.

CAUTION:

Cover engine openings to avoid entry of foreign materials.

INSTALLATION

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

EXHAUST MANIFOLD GASKET

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

(Follow the same procedure for both banks.)

EXHAUST MANIFOLD

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

A

: Bank 2

B

: Bank 1

JPBIA0271ZZ

A

:  Bank  1

B

:  Bank  2

: Engine front

JPBIA0017ZZ

A

:  Bank  1

B

: Triangle press

C

:  Bank  2

: Engine front

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