Infiniti QX56 (Z62). Manual - part 650

 

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Infiniti QX56 (Z62). Manual - part 650

 

 

EM-40

< REMOVAL AND INSTALLATION >

EXHAUST MANIFOLD AND THREE WAY CATALYST

EXHAUST MANIFOLD AND THREE WAY CATALYST

Exploded View

INFOID:0000000006289550

Removal and Installation

INFOID:0000000006289551

REMOVAL

WARNING:

Perform the work when the exhaust and cooling system have cooled sufficiently.

1.

Drain engine coolant from radiator. Refer to 

CO-8, "Draining"

.

CAUTION:

• Perform this step when the engine is cold.
• Never spill engine coolant on drive belt.

2.

Remove reservoir tank. Refer to 

CO-13, "Exploded View"

.

3.

Remove drive belt. Refer to 

EM-20, "Removal and Installation"

.

4.

Remove power steering oil pump. Refer to 

ST-48, "Exploded View"

.

5.

Remove radiator. Refer to 

CO-13, "Exploded View"

6.

Remove front under cover. Refer to 

EXT-25, "Exploded View"

.

7.

Remove front wheels and tires. Refer to 

WT-64, "Exploded View"

.

8.

Remove A/C compressor. Refer to 

HA-30, "Exploded View"

.

9.

Remove alternator and alternator bracket. Refer to 

CHG-25, "Exploded View"

.

10. Remove exhaust front tube (bank 1 and bank 2). Refer to 

EX-5, "Exploded View"

.

1.

Air fuel ratio sensor 1 (bank 2)

2.

Exhaust manifold cover (bank 2)

3.

Exhaust manifold and three way cat-
alyst (bank 2)

4.

Gasket

5.

Exhaust manifold and three way cat-
alyst (bank 1)

6.

Exhaust manifold cover (bank 1)

7.

Air fuel ratio sensor 1 (bank 1)

Refer to 

GI-4, "Components"

 for symbols in the figure.

JSBIA0389GB

EXHAUST MANIFOLD AND THREE WAY CATALYST

EM-41

< REMOVAL AND INSTALLATION >

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11. Remove front propeller shaft. Refer to 

DLN-128, "Exploded View"

.

12. Disconnect steering lower joint. Refer to 

ST-37, "Exploded View"

.

13. Remove air fuel ratio sensor 1 as per the following:

CAUTION:

Air fuel ratio sensor 1 is not reusable. Never remove air fuel ratio sensor 1 unless this is required.
• Using the heated oxygen sensor wrench [SST: KV10117100

(J-44626)] (A), remove air fuel ratio sensor 1 (1).

14. Remove exhaust manifold cover.
15. Remove oil level gauge guide. Refer to 

EM-57, "Exploded View"

.

16. Remove exhaust manifold.

• Loosen nuts in the reverse order of figure to remove exhaust

manifold with a power tool.

17. Remove exhaust manifold gaskets.

CAUTION:

Cover engine openings to avoid entry of foreign materials.

INSTALLATION

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

Exhaust Manifold Gasket

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

NOTE:
When install exhaust manifold gasket, coating surface (black) shall
be located on the exhaust manifold side.

Exhaust Manifold

: Vehicle front

JPBIA3492ZZ

A : 

Bank 

1

B : 

Bank 

2

: Engine front

JPBIA3475ZZ

A

: Triangle press

: Above

JPBIA2078ZZ

EM-42

< REMOVAL AND INSTALLATION >

EXHAUST MANIFOLD AND THREE WAY CATALYST

• Tighten mounting nuts in numerical order as shown in the figure.

CAUTION:

All exhaust manifold nuts are tightened at twice.

Air Fuel Ratio Sensor 1, Heated Oxygen Sensor 2

CAUTION:

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

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

• Sensors are not reusable. Replace them with a new one after removal. When replacing them, handle

with care not to impact on them.

•  When installing the new air fuel ratio sensors 1 (1), set the

heated oxygen sensor wrench [SST: KV10117100(J-44626)] (A)
in the hexagonal part to tighten the them.

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

on.

Inspection

INFOID:0000000006289552

INSPECTION AFTER DISASSEMBLY

Surface Distortion

• 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.

A

:  Bank  1

B

:  Bank  2

: Engine front

JPBIA3475ZZ

JPBIA3492ZZ

Limit

: Refer to 

EM-133, "Exhaust Manifold"

.

JPBIA0018ZZ

HIGH PRESSURE FUEL PUMP AND FUEL HOSE

EM-43

< REMOVAL AND INSTALLATION >

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HIGH PRESSURE FUEL PUMP AND FUEL HOSE

Exploded View

INFOID:0000000006289553

CAUTION:

Never remove or disassemble parts unless instructed as shown in the figure.

Removal and Installation

INFOID:0000000006289554

REMOVAL

WARNING:

• Be sure to read 

EM-4, "Precaution for Handling High Pressure Fuel System"

 when working on the

high pressure fuel system.

• Put a “CAUTION: FLAMMABLE” sign in the workshop.
• Be sure to work in a well ventilated area and furnish workshop with a CO

fire extinguisher.

• Never smoke while servicing fuel system. Keep open flames and sparks away from the work area.
• To avoid the danger of being scalded, never drain engine coolant when engine is hot.
1.

Release fuel pressure. Refer to 

EC-153, "Work Procedure"

.

2.

Remove intake manifold. Refer to 

EM-30, "Removal and Installation"

.

3.

Disconnect harness connector from high pressure fuel pump.

1.

High pressure fuel pump insulator

2.

High pressure fuel pump

3.

O-ring

4.

Lifter

5.

Fuel pump connector protector

6.

Copper washer

7.

Fuel feed hose

8.

Copper washer

9.

Low fuel pressure sensor

10. Bracket

11. Fuel feed tube (pump side)

A.

From fuel tank

: Engine front

Refer to 

GI-4, "Components"

 for symbols in the figure.

JPBIA4596GB

 

 

 

 

 

 

 

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