Infiniti FX35, FX50 (S51). Manual - part 967

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SPARK PLUG

3.

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

INSTALLATION

Installation is 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 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-282, "Spark Plug"

.

• Spark plug gap adjustment is not required between replace-

ment intervals.

a

: 14 mm (0.55 in)

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Spark plug (Standard type)

: Refer to 

EM-282, "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

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CAMSHAFT VALVE CLEARANCE

Inspection

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INSPECTION

Check valve clearance if applicable to the following cases:

Intake side:

• At the removal and installation of VVEL ladder assembly or valve-related parts, or at the occurrence of mal-

function (poor starting, idle malfunction, unusual noise) due to aged deterioration in valve clearance.

CAUTION:

Valve clearance check on the intake side is not required after replacing the VVEL ladder assembly &
cylinder head assembly with a new one. (Install new VVEL ladder assembly & cylinder head assembly
in factory-shipped condition because it is factory-adjusted and inspected.)
NOTE:
VVEL ladder assembly cannot be replaced as a single part, because it is machined together with cylinder
head assembly.

Exhaust side:

• At the removal, installation, and replacement of camshaft (EXH) or valve-related parts, or at the occurrence

of malfunction (poor starting, idle malfunction, unusual noise) due to aged deterioration in valve clearance.

1.

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

EM-191, "Removal and Installation"

.

2.

Measure the valve clearance as per the following:
• Use the feeler gauge (commercial service tool) of curved-tip. This allows the feeler gauge to access the

clearance between camshaft (drive shaft) nose and valve lifter with ease.

NOTE:
Be sure to note the following points when measuring valve clearance on the intake side.
• Before measuring, check that the position of drive shaft nose

is within the angle shown in the figure.

• Refer to the figure for the insertion direction of the feeler

gauge since the direction depends on the bank.

a.

Set No. 1 cylinder at TDC of its compression stroke.

Valve clearance

: Refer to 

EM-283, "Camshaft"

.

A

:  Bank  2

B

: Feeler gauge (commercial service tool)

c

: 45 degrees (drive shaft nose angle)

D

:  View  D

: Insertion direction of feeler gauge on the bank 2

: Insertion direction of feeler gauge on the bank 1

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CAMSHAFT VALVE CLEARANCE

• Rotate crankshaft pulley clockwise to align timing mark

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

• Check that exhaust cam nose on No. 1 cylinder (engine front

side of bank 1) is located as shown in the figure.

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

as shown in the figure.

• 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

NOTE:

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1

: Camshaft (EXH) (bank 1)

: Engine front

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: Engine front

Measuring position [bank 2 (A)]

No. 2 

CYL.

No. 4 

CYL. 

No. 6 

CYL.

No. 8 

CYL.

No. 1 cylinder at com-

pression TDC

EXH

×

 (C)

INT

×

 (D)

×

 (E)

Measuring position [bank 1 (B)]

No. 1 

CYL.

No. 3 

CYL.

No. 5 

CYL.

No. 7 

CYL.

No. 1 cylinder at com-

pression TDC

INT

×

 (F)

×

 (G)

EXH

×

 (H)

×

 (I)

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CAMSHAFT VALVE CLEARANCE

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To measure valve clearance of No. 1 cylinder INT valve (front
side), insert feeler gauge (commercial service tool) from the
front side (A) of the control shaft bracket or camshaft (EXH) side
(B).

b.

Rotate crankshaft 270 degrees clockwise (when viewed from engine front) to align No. 3 cylinder at TDC
its compression stroke.
NOTE:
Crankshaft pulley mounting bolt flange has an angle mark (B)
every 90 degrees (c). They can be used as a guide to rotation
angle. 

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

locations marked “

×

” as shown in the table below (locations

indicated in the figure).

• No. 3 cylinder at compression TDC

c.

Rotate crankshaft 90 degrees clockwise (when viewed from engine front) to align No. 6 cylinder at TDC of
compression stroke.
NOTE:

1

: Valve lifter

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A

: Paint mark

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: Engine front

Measuring position [bank 2 (A)]

No. 2 

CYL.

No. 4 

CYL. 

No. 6 

CYL.

No. 8 

CYL.

No. 3 cylinder at com-

pression TDC

EXH

×

 (C)

INT

×

 (D)

Measuring position [bank 1 (B)]

No. 1 

CYL.

No. 3 

CYL.

No. 5 

CYL.

No. 7 

CYL.

No. 3 cylinder at com-

pression TDC

INT

×

 (E)

×

 (F)

EXH

×

 (G)

×

 (H)

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