Infiniti G37 Coupe. Manual - part 627

CAMSHAFT

EM-83

< DISASSEMBLY AND ASSEMBLY >

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CAMSHAFT

Exploded View

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CAUTION:

As for replacement of parts on the intake side as shown in the exploded view, replace VVEL ladder
assembly & cylinder head assembly. (Single part replacement is not possible.) 
NOTE:

1.

VVEL control shaft position sensor 
(bank 1)

2.

VVEL actuator sub assembly (bank 1) 3.

Actuator bracket (rear) (bank 1)

4.

Washer

5.

VVEL ladder assembly (bank 1)

6.

Washer

7.

Timing chain tensioner (secondary) 
(bank 1)

8.

Camshaft (EXH) (bank 1)

9.

Valve lifter (EXH)

10. Valve lifter (INT)

11.

 Oil filter

12. Cylinder head (bank 1)

13.

Timing chain tensioner (secondary) 
(bank 2)

14.

Cylinder head (bank 2)

15. Camshaft (EXH) (bank 2)

16. VVEL ladder assembly (bank 2)

17.

VVEL actuator sub assembly (bank 2) 18.

VVEL control shaft position sensor 
(bank 2)

19. Actuator bracket (rear) (bank 2)

A.

Refer to 

EM-84

Refer to 

GI-4, "Components"

 for symbol marks in the figure.

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EM-84

< DISASSEMBLY AND ASSEMBLY >

CAMSHAFT

VVEL ladder assembly cannot be replaced as a single part, because it is machined together with cylinder
head assembly.

VVEL Ladder Assembly & Cylinder Head Assembly Features

NOTE:
The figure shows an example of bank 2.

Disassembly and Assembly

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DISASSEMBLY

CAUTION:

Never loosen adjusting bolts (A) and mounting bolts (black color) (B) of VVEL ladder assembly. If loos-
ened, the stroke of cam lift becomes out of adjustment. In such case, replacement of VVEL ladder
assembly and cylinder head assembly is required. 
NOTE:
VVEL ladder assembly cannot be replaced as a single part, because it is machined together with cylinder
head assembly.

1.

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

EM-45, "Exploded View"

.

2.

Remove VVEL actuator sub assembly as follows:

CAUTION:

VVEL actuator sub assembly and VVEL control shaft position sensor are nonreusable. Never
remove them unless they are required.

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A.

Control shaft

B.

Drive shaft

C.

Hexagonal part of drive shaft

D.

Hexagonal part of camshaft (EXH)

: Engine front

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CAMSHAFT

EM-85

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a.

Remove VVEL control shaft position sensor.

b.

Turn control shaft to the large lift side and fix it in order to prevent the interference of the stopper surface.
• If control shaft cannot be moved, set crankshaft in position referring to the information below. (To dis-

place cam nose)

c.

Fix two flat areas (C) of control shaft with a wrench to remove
mounting bolts of control shaft.

CAUTION:

• During the operation, never allow a wrench to interfere

with other parts.

• Fix control shaft to prevent the interference of the stopper

surface.

d.

Remove actuator bracket (rear).
• Loosen mounting bolts in the reverse order as shown in the

figure.

e.

Remove VVEL actuator sub assembly.
• Loosen mounting bolts in the reverse order as shown in the

figure.

CAUTION:

• When removing, prepare wastes because oil spills.
• When installing, be careful with VVEL actuator sub

assembly (bank 2) mounting bolt No. 1 because its length
is different. 

3.

Remove front timing chain case, camshaft sprockets, and timing chain. Refer to 

EM-48, "Exploded View"

.

Bank 1

: Turn 120 degrees from No. 1 cylinder at TDC

Bank 2

: No. 1 cylinder at TDC

A

: Bank 1

B

: Bank 2

: Engine front

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A

: Bank 1

B

: Bank 2

: Engine front

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A

:  Bank  2

B

:  Bank  1

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EM-86

< DISASSEMBLY AND ASSEMBLY >

CAMSHAFT

4.

Remove rear timing chain case. Refer to 

EM-78, "Exploded View"

.

5.

Remove VVEL ladder assembly.
• Loosen mounting bolts (gold color) in the reverse order as

shown in the figure.

CAUTION:

• Never loosen adjusting bolts and mounting bolts (black

color).

• When removing VVEL ladder assembly, hold the drive

shaft from below so as not to drop it.

6.

Remove camshaft (EXH).

7.

Remove valve lifter.
• Identify installation positions, and store them without mixing them up.

8.

Remove timing chain tensioners (secondary) (1) from cylinder
head.

• Remove timing chain tensioners (secondary) with its stopper

pin (C) attached.

NOTE:
Stopper pin should be attached when timing chain (secondary)
is removed.

9.

Remove oil filter from cylinder head, if necessary.

ASSEMBLY

1.

Install timing chain tensioners (secondary) (1) on both sides of
cylinder head.

• Install timing chain tensioner with its stopper pin (C) attached. 
• Install timing chain tensioner with sliding part facing downward

on cylinder head (bank 1), and with sliding part facing upward
on cylinder head (bank 2).

A

:  Bank  1

B

:  Bank  2

: Engine front

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A

:  Bank  1

B

:  Bank  2

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A

:  Bank  1

B

:  Bank  2

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