Infiniti FX35, FX50 (S51). Manual - part 930

EM-20

< PERIODIC MAINTENANCE >

[VQ35HR]

CAMSHAFT VALVE CLEARANCE

CAMSHAFT VALVE CLEARANCE

Inspection and Adjustment

INFOID:0000000005245121

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-50, "Removal and Installation"

.

2.

Measure the valve clearance as per the following:

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

JPBIA0164ZZ

: Timing mark (grooved line without color)

JPBIA0043ZZ

: Engine front

JPBIA0044ZZ

Valve clearance

: Refer to 

EM-143, "Camshaft"

.

SEM139D

CAMSHAFT VALVE CLEARANCE

EM-21

< PERIODIC MAINTENANCE >

[VQ35HR]

C

D

E

F

G

H

I

J

K

L

M

A

EM

N

P

O

• 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 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)

JPBIA0165ZZ

1

: Crankshaft pulley

A

: Paint mark

JPBIA0166ZZ

EM-22

< PERIODIC MAINTENANCE >

[VQ35HR]

CAMSHAFT VALVE CLEARANCE

• 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

d.

Rotate crankshaft 240 degrees clockwise (when viewed from engine front) to align No. 5 cylinder at TDC
of 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. 3 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. 3 cylinder at com-

pression TDC

INT (D)

×

 (F)

EXH (C)

×

 (G)

JPBIA0167ZZ

1

: Crankshaft pulley

A

:  Paint  mark

JPBIA0166ZZ

CAMSHAFT VALVE CLEARANCE

EM-23

< PERIODIC MAINTENANCE >

[VQ35HR]

C

D

E

F

G

H

I

J

K

L

M

A

EM

N

P

O

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

locations marked “

×

” as shown in the table below (locations

indicated in the figure).

• No. 5 cylinder at compression TDC

3.

Perform adjustment if the measured value is out of the standard. Refer to “ADJUSTMENT”.

ADJUSTMENT

• Perform adjustment depending on selected head thickness of valve lifter.
1.

Measure the valve clearance. Refer to “INSPECTION”.

2.

Remove camshaft. Refer to 

EM-70, "Removal and Installation"

.

3.

Remove valve lifters at the locations that are out of the standard.

4.

Measure the center thickness of the removed valve lifters with a
micrometer (A).

5.

Use the equation below to calculate valve lifter thickness for replacement.

: Engine front

Measuring position [bank 1 (A)]

No. 1 CYL.

No. 3 CYL.

No. 5 CYL.

No. 5 cylinder at 

compression TDC

EXH (C)

×

 (B)

INT (D)

×

 (E)

Measuring position [bank 2 (H)]

No. 2 CYL.

No. 4 CYL.

No. 6 CYL.

No. 5 cylinder at 

compression TDC

INT (D)

×

 (F)

EXH (C)

×

 (G)

JPBIA0168ZZ

JPBIA0169ZZ

Valve lifter thickness calculation:

t = t

1

+ (C

1 

– C

2

)

t

= Valve lifter thickness to be replaced

t

1

= Removed valve lifter thickness

C

1

= Measured valve clearance

C

2

= Standard valve clearance:

Intake

: 0.30 mm (0.012 in) 

Exhaust

: 0.33 mm (0.013 in)