Nissan Murano Z51. Manual - part 637

EM-20

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SPARK PLUG

SPARK PLUG

Exploded View

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Removal and Installation

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REMOVAL

1.

Remove engine cover. Refer to 

EM-29, "Exploded View"

.

2.

Remove air cleaner cases (upper and lower) and air duct assembly. Refer to 

EM-31, "Exploded View"

.

3.

Remove electric throttle control actuator. Refer to 

EM-33, "Exploded View"

.

4.

Remove intake manifold collector. Refer to 

EM-33, "Exploded View"

.

5.

Remove ignition coil. Refer to 

EM-54, "Exploded View"

.

1.

Ignition coil

2.

Spark plug

3.

PCV hose

4.

Clamp

5.

PCV valve

6.

O-ring

7.

Rocker cover (bank 1)

8.

PCV hose

9.

Rocker cover gasket (bank 1)

10.

O-ring

11.

Camshaft position sensor (PHASE) 
(bank 1)

12. Oil filler cap

13.

Rocker cover (bank 2)

14.

Rocker cover gasket (bank 2)

15.

Camshaft position sensor (PHASE) 
(bank 2)

16.

PCV hose

17.

Clamp

A.

To intake manifold collector

B.

Refer to 

EM-54

C.

Camshaft bracket side

D.

To air duct

Refer to 

GI-4, "Components"

 for symbols in the figure.

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SPARK PLUG

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6.

Remove spark plug with a spark plug wrench (commercial ser-
vice tool).

INSTALLATION

Install in the reverse order of removal.

Inspection

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INSPECTION AFTER REMOVAL

Use the standard type spark plug for normal condition.

CAUTION:

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

used.

• Spark plug gap adjustment is not required between replace-

ment intervals.

• Measure spark plug gap. When it exceeds the limit, replace

spark plug even if it is within the specified replacement mile-
age. Refer to 

EM-146, "Spark Plug"

.

a

: 14 mm (0.55 in)

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Spark plug (Standard type)

: Refer to 

EM-146, "Spark Plug"

.

Cleaner air pressure:

Less than 588 kPa (6 kg/cm

2

, 85 

psi)

Cleaning time:

Less than 20 seconds

SMA773C

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CAMSHAFT VALVE CLEARANCE

CAMSHAFT VALVE CLEARANCE

Inspection and Adjustment

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INSPECTION

Perform inspection as follows after removal, installation or replacement of camshaft or valve-related parts, or if
there is unusual engine conditions regarding valve clearance.
In cases of removing/installing or replacing camshaft and valve-
related parts, or of unusual engine conditions due to changes in
valve clearance (found malfunctions during stating, idling or causing
noise), perform inspection as follows:

1.

Remove rocker covers (bank 1 and bank 2). Refer to 

EM-54, "Exploded View"

.

2.

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

(grooved line without color) (

) with timing indicator.

• Check that intake and exhaust cam nose on No. 1 cylinder

(engine front side of bank 1) are located as shown in the fig-
ure.

• If not, turn crankshaft one revolution (360 degrees) and align

as shown in the figure.

b.

Use a feeler gauge, measure the clearance between valve lifter
and camshaft.

: Engine front

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SEM727G

: Engine front

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Valve clearance

: Refer to 

EM-146, "Camshaft"

.

SEM139D

CAMSHAFT VALVE CLEARANCE

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• By referring to the figure, measure the valve clearances at

locations marked “

×

” as shown in the table below (locations

indicated in the figure).

• No. 1 cylinder at compression TDC

c.

Rotate crankshaft by 240 degrees clockwise (when viewed from engine front) to align No. 3 cylinder at
TDC its compression stroke.
NOTE:
Mark a position 240 degrees (b) from a corner of the hexagonal
part of crankshaft pulley mounting bolt as shown in the figure.
Use the hexagonal part as a guide. 

: Engine front

Measuring position [bank 1 (A)]

No. 1 CYL.

No. 3 CYL. 

No. 5 CYL.

No. 1 cylinder at com-

pression TDC

EXH (C)

×

 (B)

INT (D)

×

 (E)

Measuring position [bank 2 (H)]

No. 2 CYL.

No. 4 CYL.

No. 6 CYL.

No. 1 cylinder at com-

pression TDC

INT (D)

×

 (F)

EXH (C)

×

 (G)

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: Crankshaft pulley

A

: Paint mark

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