Infiniti QX56 (Z62). Manual - part 646

EM-24

< PERIODIC MAINTENANCE >

SPARK PLUG

Install ignition coil marked with an identification mark (A) on
cylinder No. 5, 6, 7 and 8.

Inspection

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INSPECTION AFTER REMOVAL

Use the standard type spark plug for normal condition.

CAUTION:

• Never drop or impact spark plug.
• Never use a wire brush for cleaning.
• If plug tip is covered with carbon, use spark plug cleaner to

clean.

• Measure spark plug gap. When it exceeds the limit, replace spark plug even if it is within the speci-

fied replacement mileage. Refer to 

EM-132, "Spark Plug"

.

• Spark plug gap adjustment is not required between replace-

ment intervals.

: Engine front

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Spark plug (Standard type)

: Refer to 

EM-132, "Spark Plug"

.

Cleaner air pressure

: Less than 588 kPa (5.9 bar, 6 kg/cm

2

, 85 psi)

Cleaning time

: Less than 20 seconds

SMA773C

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ENGINE COVER

EM-25

< REMOVAL AND INSTALLATION >

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REMOVAL AND INSTALLATION

ENGINE COVER

Exploded View

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Removal and Installation

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REMOVAL

CAUTION:

Never damage or scratch engine cover when installing or removing.

1.

Remove mounting bolts.

2.

Pull forward and remove engine cover.

3.

Remove bracket (front) and bracket (rear).

INSTALLATION

Installation is the reverse order of removal.

1.

Engine cover

2.

Bracket (front)

3.

Intake manifold

4.

Bracket (rear)

Refer to 

GI-4, "Components"

 for symbols in the figure.

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EM-26

< REMOVAL AND INSTALLATION >

DRIVE BELT AUTO TENSIONER AND IDLER PULLEY

DRIVE BELT AUTO TENSIONER AND IDLER PULLEY

Exploded View

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Removal and Installation

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Removal

CAUTION:

The complete drive belt auto-tensioner must be replaced as a unit, including the pulley.

1.

Remove drive belts. Refer to 

EM-20, "Exploded View"

.

• Keep auto-tensioner pulley arm locked after drive belt is removed.

2.

Remove drive belt auto-tensioner.
• Keep auto-tensioner pulley arm locked to install or remove auto-tensioner.

CAUTION:

Never loosen the hexagonal part in center of drive belt auto tensioner pulley (Never turn it clock-
wise). If turned clockwise, the complete drive belt auto tensioner must be replaced as a unit,
including the pulley.

3.

Remove idler pulley.

Installation

Installation is the reverse order of removal.

CAUTION:

Never swap the pulley between new and old drive belt auto tensioner.

1.

Drive belt auto-tensioner

2.

Idler pulley

3.

Fan bracket

Refer to 

GI-4, "Components"

 for symbols in the figure.

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AIR CLEANER AND AIR DUCT

EM-27

< REMOVAL AND INSTALLATION >

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AIR CLEANER AND AIR DUCT

Exploded View

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Removal and Installation

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REMOVAL

NOTE:
Mass air flow sensor is removable under the car-mounted condition.

1.

Remove engine cover. Refer to 

EM-25, "Exploded View"

.

2.

Disconnect mass air flow sensor harness connector.

3.

Remove air cleaner case and mass air flow sensor assembly and air duct by disconnecting their joints.
• Add matching marks, if necessary for easier installation.

4.

Remove mass air flow sensor from air cleaner case, if necessary.

CAUTION:

Handle mass air flow sensor according to the following instructions.
• Never impact it.
• Never disassemble it.
• Never touch its sensor.

5.

Disconnect PCV hose from air duct.

6.

Remove air duct.

7.

Remove air cleaner filter.

8.

Remove air cleaner case (lower).

9.

Remove adapter.

10. If remove resonator (location in wheel house), refer to following.
a.

Remove LH front wheel and tire.

b.

Remove fender protector. Refer to 

EXT-23, "FENDER PROTECTOR : Exploded View"

.

c.

Remove resonator.

INSTALLATION

1.

Resonator

2.

Adapter

3.

Air cleaner case (lower)

4.

Air cleaner filter

5.

Air cleaner case (upper)

6.

Mass air flow sensor

7.

Air duct

8.

Clamp

Vehicle front

Refer to 

GI-4, "Components"

 for symbols in the figure.

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