Infiniti FX35, FX50 (S51). Manual - part 940

EM-60

< REMOVAL AND INSTALLATION >

[VQ35HR]

TIMING CHAIN

1.

Install timing chain tensioners (secondary) to cylinder head as follows if removed. Refer to 

EM-70,

"Exploded View"

.

2.

Check that dowel pin (A) and crankshaft key (1) are located as
shown in the figure. (No. 1 cylinder at compression TDC)
NOTE:
Though camshaft does not stop at the position as shown in the
figure, for the placement of cam noses, it is generally accepted
camshaft is placed for the same direction of the figure.

3.

Install timing chains (secondary) and camshaft sprockets as per the following:

CAUTION:

Matching marks between timing chain and sprockets slip easily. Confirm all matching mark posi-
tions repeatedly during the installation process.

1.

Internal chain guide

2.

Camshaft sprocket (INT)

3.

Timing chain (secondary)

4.

Camshaft sprocket (EXH)

5.

Timing chain tensioner (primary)

6.

Slack guide

7.

Timing chain (primary)

8.

Crankshaft sprocket

9.

Water pump

10. Timing chain tensioner (secondary)

A.

Matching mark [punched (back side)]

B.

Matching mark (yellow link)

C.

Matching mark (punched)

D.

Matching mark (orange link)

E.

Matching mark (notched)

F.

Crankshaft key

Camshaft dowel pin

: At cylinder head upper face side in each bank.

Crankshaft key

: At cylinder head side of bank 1.

JPBIA0066ZZ

JPBIA0094ZZ

TIMING CHAIN

EM-61

< REMOVAL AND INSTALLATION >

[VQ35HR]

C

D

E

F

G

H

I

J

K

L

M

A

EM

N

P

O

a.

Push plunger of timing chain tensioner (secondary) and keep it
pressed in with a stopper pin (A).

b.

Install timing chains (secondary) and camshaft sprockets.
• Align the matching marks on timing chain (secondary) (orange

link) with the ones on intake and exhaust camshaft sprockets
(punched), and install them.

NOTE:
• Figure shows bank 1 (rear view).
• Matching marks for camshaft sprockets are on the back side

of camshaft sprockets (secondary).

• There are two types of matching marks, circle and oval

types. They should be used for the bank 1 and bank 2,
respectively.

• Align dowel pin camshafts with the groove or dowel hole on sprockets, and install them.
• On the intake side, align dowel pin on camshaft front end with pin groove on the back side of camshaft

sprocket, and install them.

• On the exhaust side, align dowel pin on camshaft front end with pin hole on camshaft sprocket, and

install them.

• In case that positions of each matching mark and each dowel pin are not fit on matching parts, make

fine adjustment to the position holding the hexagonal portion on camshaft with wrench or an equivalent.

• Mounting bolts for camshaft sprockets must be tightened in the next step. Tightening them by hand is

enough to prevent the dislocation of dowel pins.

• Check the matching marks (punched) (D) on each camshaft

sprocket are positioned on the matching marks (orange link)
(C) on timing chain (secondary).

NOTE:
Matching mark (punched) in the figure is for checking loose at
this step.

JPBIA0095ZZ

A

:  Camshaft  sprocket (INT) back face

B

: Orange link

C

: Matching mark (Circle)

D

: Matching mark (Oval)

E

: Dowel groove

F

: Matching mark (2 oval)

G

: Camshaft sprocket (EXH) back face

H

: Matching mark (2 circle)

I

: Dowel hole

J

: Timing chain (secondary)

Bank 1

: Use circle type.

Bank 2

: Use oval type.

A

: Intake side

B

: Exhaust side

JPBIA1791ZZ

JPBIA0114ZZ

EM-62

< REMOVAL AND INSTALLATION >

[VQ35HR]

TIMING CHAIN

c.

After confirming the matching marks are aligned, tighten camshaft sprocket mounting bolts.
• Secure camshaft using a wrench at the hexagonal portion to

tighten mounting bolts.

d.

Pull stopper pins (2) out from timing chain tensioners (second-
ary) (1).

4.

Install timing chain (primary) as per the following:

a.

Install crankshaft sprocket (1).

• Check the matching marks on crankshaft sprocket face the

front of the engine.

b.

Install timing chain (primary).

KBIA4379J

A

:  Bank  1

B

:  Bank  2

JPBIA0087ZZ

A

: Matching mark (Front side)

: Engine front

JPBIA1108ZZ

TIMING CHAIN

EM-63

< REMOVAL AND INSTALLATION >

[VQ35HR]

C

D

E

F

G

H

I

J

K

L

M

A

EM

N

P

O

• Install timing chain (primary) so the matching mark (punched)

(B) on camshaft sprocket (INT) (1) is aligned with the yellow
link (A) on timing chain, while the matching mark (notched) (C)
on crankshaft sprocket (2) is aligned with the orange link (D)
one on timing chain, as shown in the figure.

• When it is difficult to align matching marks of timing chain (pri-

mary) with each sprocket, gradually turn camshaft using
wrench on the hexagonal portion to align it with the matching
marks.

• During alignment, be careful to prevent dislocation of matching

mark alignments of timing chains (secondary).

5.

Install internal chain guide (1), slack guide (2).

CAUTION:

3

: Water pump

JPBIA1601ZZ

JPBIA0086ZZ