Infiniti QX56 (Z62). Manual - part 652

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< REMOVAL AND INSTALLATION >

FUEL INJECTOR AND FUEL TUBE

FUEL INJECTOR AND FUEL TUBE

Exploded View

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CAUTION:

• Never remove or disassemble parts unless instructed as shown in the figure.
• Be sure to follow the tightening instruction to avoid fuel leakage.

1.

Fuel tube insulator (bank 2)

2.

Fuel tube insulator (center)

3.

Fuel tube insulator (bank 1)

4.

High pressure fuel pump

5.

Fuel feed tube (pump side)

6.

Fuel feed tube (bank side)

7.

Fuel rail (bank 2)

8.

Injector holder

9.

O-ring (blue)

10. Backup ring

11. Fuel injector

12. Seal ring

13. Insulator

14. Fuel rail (bank 1)

15. Gasket

16. Fuel rail pressure sensor

A.

Comply with the installation proce-
dure when tightening. Refer to 

EM-

49, "Removal and Installation"

.

Refer to 

GI-4, "Components"

 for symbols in the figure.

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Removal and Installation

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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

2 

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.

Remove fuel feed tube (pump side) and fuel feed tube (bank side).

CAUTION:

Never reuse fuel feed tube.

4.

Remove fuel rail (bank 1) and fuel rail (bank 2).

5.

Disconnect harness connector from fuel injectors.

6.

Remove fuel injector from cylinder head as per the following:

CAUTION:

• Be careful with remaining fuel that may go out from fuel tube.
• Be careful not to damage injector nozzles during removal.
• Never bump or drop fuel injector.
• Never disassemble fuel injector.

a.

Remove injector holder.

b.

Install an injector remover [SST: KV10119600 (—)] (A) to the
injector connector side so that cutout (B) of injector remover
faces the injector connector side. 

• Hook pawl portion (B) of injector remover [SST: KV10119600

(—)] (A) to groove portion (C) of injector. 

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FUEL INJECTOR AND FUEL TUBE

c.

Press down body portion (A) of injector remover [SST:
KV10119600 (—)] until it contacts cylinder head. 

d.

Tighten injector remover [SST: KV10119600 (—)] clockwise and
remove injector from cylinder head. 

e.

Cut Teflon seal (1) while pinching it. Be careful not to damage
injector.

f.

Remove insulator from mounting hole of fuel injector of cylinder
head.

INSTALLATION

1.

Install seal ring to fuel injector as per the following:

CAUTION:

• Handle seal ring with bare hands. Never wear gloves.
• Never apply engine oil to seal ring.
• Never clean seal ring with solvent.

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a.

Install an injector seal drift set [SST: KV101197S0 (—)] (A) to
fuel injector (1). 

b.

Set seal ring (1) to injector seal drift set [SST: KV101197S0 (—)]
(A). 

c.

Straightly insert seal ring (1), which is set in step 2, to fuel injec-
tor as shown in the figure and install.

CAUTION:

Be careful that seal ring does not exceed the groove portion
of fuel injector.

d.

Insert injector seal drift set [SST: KV101197S0 (—)] (A) to injec-
tor and rotate clockwise and counterclockwise by 90

°

 while

pressing seal ring to fit it.
NOTE:
Compress seal ring, because this operation is for rectifying
stretch of seal ring caused by installation and for preventing
sticking when inserting injector into cylinder head.

2.

Install O-ring and backup ring to fuel injector. When handing new O-ring and backup ring, paying attention
to the following caution items:

CAUTION:

• Handle O-ring with bare hands. Never wear gloves.
• Lubricate O-ring with new engine oil.
• Never clean O-ring with solvent.
• Check that O-ring and its mating part are free of foreign material.
• When installing O-ring, be careful not to scratch it with tool or fingernails. Also be careful not to

twist or stretch O-ring. If O-ring was stretched while it was being attached, never insert it quickly
into fuel tube.

• Insert new O-ring straight into fuel rail. Never decenter or twist it.

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