Infiniti FX35, FX50 (S51). Manual - part 943

EM-72

< REMOVAL AND INSTALLATION >

[VQ35HR]

CAMSHAFT

• Install timing chain tensioners (1) with its stopper pin (C)

attached. 

2.

Install valve lifter.
• Install it in the original position.

3.

Install camshafts.
• Follow your identification marks made during removal, or fol-

low the identification marks that are present on new camshafts
for proper placement and direction.

• Install camshaft so that dowel pin (A) on front end face are

positioned as shown in the figure. (No. 1 cylinder TDC on its
compression stroke)

NOTE:
Though camshaft does not stop at the portion as shown in the
figure, for the placement of cam nose, it is generally accepted
camshaft is placed for the same direction of the figure.

Bank 1 side (A)

: Sliding part facing downward

Bank 2 side (B)

: Sliding part facing upward

JPBIA0121ZZ

: Engine front

Bank

INT/EXH

Dowel pin 

(1)

Paint marks

Identification 

mark (C)

M1 (E)

M2 (F)

M3 (D)

1

EXH (B)

Yes

No

Green

Light 

blue

1F

INT (A)

Yes

Green

No

Light 

blue

1E

2

INT (A)

Yes

Green

No

Light 

blue

1G

EXH (B)

Yes

No

Green

Light 

blue

1H

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1

: Crankshaft key

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CAMSHAFT

EM-73

< REMOVAL AND INSTALLATION >

[VQ35HR]

C

D

E

F

G

H

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K

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M

A

EM

N

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O

4.

Install camshaft brackets.

• Remove foreign material completely from camshaft bracket

backside and from cylinder head installation face.

• Install camshaft bracket in original position and direction as

shown in figure.

• Install camshaft brackets (No. 2 to 4) aligning the stamp marks

(A) as shown in the figure.

NOTE:
There are no identification marks indicating bank 1 and bank 2
for camshaft bracket (No. 1).

• Apply liquid gasket to mating surface of camshaft bracket (No.

1) as shown on both bank 1 and bank 2.

Use Genuine RTV Silicone Sealant or an equivalent. Refer
to 

GI-16, "Recommended Chemical Products and Seal-

ants"

.

A

:  No.  1

B

:  No.  2

C

:  No.  3

D

:  No.  4

E

: Camshaft brackets (bank 1)

F

: Exhaust side

G

: Intake side

H

: Camshaft brackets (bank 2)

I

: Intake side

J

: Exhaust side

: Engine front

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B

:  Bank  1

C

:  Bank  2

: Engine front

JPBIA0272ZZ

a

: 8.5 mm (0.335 in)

b

: 2 mm (0.08 in)

c

: Clearance 5 mm (0.20 in)

d

: 

φ

2.5 mm (0.098 in) 

*

: Apply liquid gasket to rear timing chain side

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EM-74

< REMOVAL AND INSTALLATION >

[VQ35HR]

CAMSHAFT

• Apply liquid gasket to camshaft bracket (No. 1) contact surface

on the rear timing chain case backside as shown on both bank
1 and bank 2.

Use Genuine RTV Silicone Sealant or an equivalent. Refer
to 

GI-16, "Recommended Chemical Products and Seal-

ants"

.

CAUTION:

For camshaft bracket (No. 1) near installation position,
and install it without disturbing the liquid gasket applied
to the surfaces.

5.

Tighten camshaft bracket bolts in the following steps, in numeri-
cal order as shown in the figure.

a.

Tighten No. 7 to 10 in numerical order as shown.

b.

Tighten No. 1 to 6 in numerical order as shown.

c.

Tighten No. 1 to 10 in numerical order as shown.

d.

Tighten No. 1 to 10 in numerical order as shown.

6.

Install camshaft sensor bracket.
• Tighten camshaft sensor bracket bolts in numerical order as

shown in the figure.

NOTE:
The order of tightening bolts is the same for bank 1 and bank 2.

7.

Inspect and adjust the valve clearance. Refer to 

EM-20, "Inspection and Adjustment"

.

8.

Install in the reverse order of removal after this step.

Inspection

INFOID:0000000005245151

INSPECTION AFTER REMOVAL

Camshaft Runout

1

: Rear timing chain case

a

: 

φ

3.9 mm (0.154 in)

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: Engine front

: 1.96 N·m (0.20 kg-m, 1 ft-lb)

: 1.96 N·m (0.20 kg-m, 1 ft-lb)

: 5.88 N·m (0.60 kg-m, 4 ft-lb)

: 10.4 N·m (1.1 kg-m, 8 ft-lb)

JPBIA0257ZZ

: Engine front

JPBIA1960ZZ

CAMSHAFT

EM-75

< REMOVAL AND INSTALLATION >

[VQ35HR]

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1.

Put V-block on precise flat table, and support No. 2 and 4 jour-
nals of camshaft.

CAUTION:

Never support No. 1 journal (on the side of camshaft
sprocket) because it has a different diameter from the other
three locations.

2.

Set a dial indicator vertically to No. 3 journal.

3.

Turn camshaft to one direction with hands, and measure the
camshaft runout on a dial indicator. (Total indicator reading)

4.

If it exceeds the limit, replace camshaft.

Camshaft Cam Height

1.

Measure the camshaft cam height with a micrometer.

2.

If wear exceeds the limit, replace camshaft.

Camshaft Journal Oil Clearance

CAMSHAFT JOURNAL DIAMETER

• Measure the outer diameter of camshaft journal with a micrometer

(A).

CAMSHAFT BRACKET INNER DIAMETER

• Tighten camshaft bracket bolt with the specified torque. Refer to “INSTALLATION” for the tightening proce-

dure.

• Measure inner diameter (A) of camshaft bracket with a bore gauge.

CAMSHAFT JOURNAL OIL CLEARANCE

• (Oil clearance) = (Camshaft bracket inner diameter) – (Camshaft journal diameter).

Standard and limit

: Refer to 

EM-143, "Camshaft"

.

PBIC0929E

Standard cam height 

: Refer to 

EM-143, "Camshaft"

.

 (Intake and exhaust)

Cam wear limit

: Refer to 

EM-143, "Camshaft"

.

EMQ0072D

Standard

: Refer to 

EM-143, "Camshaft"

.

JPBIA0122ZZ

Standard

: Refer to 

EM-143, "Camshaft"

.

PBIC1645E