Nissan Xterra. Manual - part 347

EM-16

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SPARK PLUG

SPARK PLUG

Exploded View

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Removal and Installation

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REMOVAL

1. Remove the ignition coil. Refer to 

EM-40, "Removal and Installation"

.

2. Remove the spark plug using a suitable tool.

CAUTION:

Do not drop or shock it.

INSPECTION AFTER REMOVAL

• Do not use a wire brush for cleaning.

• If the spark plug tip is covered with carbon, spark plug cleaner may be used.

1.

Ignition coil

2.

Spark plug

PBIC2901E

SEM294A

SMA773C

SPARK PLUG

EM-17

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• Checking and adjusting spark plug gap is not required between

change intervals.

INSTALLATION

Installation is in the reverse order of removal.

CAUTION:

Do not drop or shock the spark plug.

*Always check with the Parts Department for the latest parts information.

Cleaner air pressure

: Less than 588 kPa (6 kg/cm

2

, 85 psi)

Cleaning time

: Less than 20 seconds

SMA806CA

Make

NGK

Standard type*

DILFR5A-11

Gap (nominal)

1.1 mm (0.043 in)

EM-18

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CAMSHAFT VALVE CLEARANCE

CAMSHAFT VALVE CLEARANCE

Valve Clearance

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INSPECTION

NOTE:

Perform the following inspection after removal, installation or replacement of camshaft or valve-related parts,

or if there are unusual engine conditions due to changes in valve clearance over time (starting, idling, and/or

noise).
1. Remove the air cleaner and air duct assembly. Refer to 

EM-24, "Exploded View"

.

2. Remove rocker covers (RH and LH banks). Refer to 

EM-41, "Removal and Installation"

.

3. Measure the valve clearance as follows:
a. Set No. 1 cylinder at TDC of its compression stroke.

• Rotate crankshaft pulley clockwise to align timing mark (A)

(grooved line without color) with timing indicator (B).

• Make sure that intake and exhaust cam noses on No. 1 cylin-

der (engine front side of RH bank) are located as shown.

• If not, rotate crankshaft one revolution (360

°) and align as

shown.

b. Use feeler gauge to measure the clearance between valve lifter

and camshaft.

Unit: mm (in)

1

: Approximately 20

°C (68°F)

2

: Approximately 80

°C (176°F)

AWBIA0719ZZ

SEM418G

SEM139D

Valve Clearance

Cold 

1

 (reference data)

Hot 

2

 (reference data)

Intake

0.26 - 0.34 (0.010 - 0.013)

0.304 - 0.416 (0.012 - 0.016)

Exhaust

0.29 - 0.37 (0.011 - 0.015)

0.308 - 0.432 (0.012 - 0.017)

CAMSHAFT VALVE CLEARANCE

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• Measure the valve clearances at locations marked “

×” as

shown in the table below (locations indicated in the illustration)

with feeler gauge.

• No. 1 cylinder at compression TDC

c. Rotate crankshaft by 240

° clockwise (when viewed from engine

front) to align No. 3 cylinder at TDC of its compression stroke.

NOTE:

Crankshaft pulley bolt flange has a stamped line every 60

°. They

can be used as a guide to rotation angle.

• Measure the valve clearances at locations marked “

×” as

shown in the table below (locations indicated in the illustration)

with feeler gauge.

• No. 3 cylinder at compression TDC

Measuring position (RH bank)

No. 1 CYL.

No. 3 CYL.

No. 5 CYL.

No. 1 cylinder at 

compression TDC

EXH

×

INT

×

Measuring position (LH bank)

No. 2 CYL.

No. 4 CYL.

No. 6 CYL.

No. 1 cylinder at 

compression TDC

INT

× 

EXH

× 

PBIC2054E

PBIC2916E

Measuring position (RH bank)

No. 1 CYL.

No. 3 CYL.

No. 5 CYL.

No. 3 cylinder at 

compression TDC

EXH

×

INT

×

Measuring position (LH bank)

No. 2 CYL.

No. 4 CYL.

No. 6 CYL.

No. 3 cylinder at 

compression TDC

INT

×

 

EXH

 

×

PBIC2055E