Infiniti FX35 / FX45. Manual - part 627

INTAKE MANIFOLD

EM-25

< SERVICE INFORMATION >

[VQ35DE]

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• Check the surface distortion of the intake manifold mating surface

with a straightedge and a feeler gauge.

• If it exceeds the limit, replace intake manifold.

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 specified torque below.

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

more steps in numerical order shown in the figure.

Limit

: 0.1 mm (0.004 in)

PBIC0870E

 : 10.8 N·m (1.1 kg-m, 8 ft-lb)

1st step:

 : 7.4 N·m (0.75 kg-m, 5 ft-lb)

2nd step and after:

 : 29.0 N·m (3.0 kg-m, 21 ft-lb)

PBIC0778E

EM-26

< SERVICE INFORMATION >

[VQ35DE]

EXHAUST MANIFOLD AND THREE WAY CATALYST

EXHAUST MANIFOLD AND THREE WAY CATALYST

Component

INFOID:0000000001325714

• Refer to 

GI-8, "Component"

 for symbols in the figure.

Removal and Installation

INFOID:0000000001325715

REMOVAL

WARNING:

Perform the work when the exhaust and cooling system have completely cooled down.

1.

Remove engine cover with power tool. Refer to 

EM-19, "Component"

.

2.

Drain engine coolant. Refer to 

CO-10, "Changing Engine Coolant"

.

CAUTION:

• Perform this step when the engine is cold.
• Do not spill engine coolant on drive belts.

3.

Remove air cleaner case and air duct. Refer to 

EM-17, "Component"

.

4.

Remove front and rear engine undercover and front cross bar with power tool.

5.

Disconnect heated oxygen sensors 2 (bank 1 and bank 2) harness connectors.

1.

Heated oxygen sensor 2 (bank 1)

2.

Three way catalyst (right bank)

3.

Gasket

4.

Air fuel ratio sensor 1 (bank 1)

5.

Exhaust manifold cover (right bank)

6.

Exhaust manifold (right bank)

7.

Exhaust manifold (left bank)

8.

Exhaust manifold cover (left bank)

9.

Three way catalyst (left bank)

10. Air fuel ratio sensor 1 (bank 2)

11. Heated oxygen sensor 2 (bank 2)

JPBIA0829GB

EXHAUST MANIFOLD AND THREE WAY CATALYST

EM-27

< SERVICE INFORMATION >

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6.

Using the heated oxygen sensor wrench (SST), remove heated
oxygen sensors 2 (bank 1 and bank 2).

CAUTION:

• Be careful not to damage heated oxygen sensor.
• Discard any heated oxygen sensor which has been

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

7.

Remove exhaust mounting bracket between three way catalysts (right and left bank) and transmission.
Refer to 

EX-3

.

8.

Remove three way catalysts (right and left bank).

9.

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

10. Using the heated oxygen sensor wrench (SST), remove air fuel

ratio sensor 1 (bank 1 and bank 2).

CAUTION:

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

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

11. Remove water pipe and heater pipe on both right and left side. Refer to 

CO-29, "Component"

.

12. Remove exhaust manifold cover (right and left bank).
13. Loosen mounting nuts in the reverse order as shown in the fig-

ure to remove exhaust manifold with power tool.
NOTE:
Disregard the numerical order No. 7 and 8 in removal.

14. Remove gaskets.

CAUTION:

Cover engine openings to avoid entry of foreign materials.

INSPECTION AFTER REMOVAL

KBIA1740E

SBIA0575E

PBIC2042E

EM-28

< SERVICE INFORMATION >

[VQ35DE]

EXHAUST MANIFOLD AND THREE WAY CATALYST

Surface Distortion

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

face with a straightedge and a feeler gauge.

• If it exceeds the limit, replace exhaust manifold.

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 same procedure for both banks.)

Exhaust Manifold

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

• Install exhaust manifold and tighten mounting bolts 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 and Heated Oxygen Sensor 2 

CAUTION:

Limit

: 0.3 mm (0.012 in)

PBIC1096E

A

: Right bank

B

: Triangle press

C

: Left bank

: Engine front

PBIC4954E

 : 14.7 N·m (1.5 kg-m, 11 ft-lb)

PBIC2042E