Disassembly and Assembly: Disassembly

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CAUTION: Never loosen adjusting bolts (A) and mounting bolts (black color) (B) of VVEL Ladder Assembly. If loosened, 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.

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

Remove VVEL Actuator Sub Assembly as per the following:

CAUTION: VVEL Actuator Sub Assembly and VVEL Control Shaft Position Sensor are not reusable. Never remove them unless they are required.

Remove VVEL Control Shaft Position Sensor.

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

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A	: Bank 2
B	: Bank 1
	: Engine front

CAUTION:

During the operation, never allow a wrench to interfere with other parts.
Fix control shaft to prevent the interference of the stopper surface.

Remove VVEL Actuator Sub Assembly.

Loosen mounting bolts in the reverse order as shown in the figure, below.

Fig 1: VVEL Actuator Sub Assembly Tightening Sequence
Courtesy of NISSAN NORTH AMERICA, INC.

A	: Bank 1
B	: Bank 2

CAUTION:

When removing, prepare rags because oil spills.
When installing, be careful with VVEL Actuator Sub Assembly (Bank 1) mounting bolt No. 4 because its length is different.

Remove Actuator Bracket (Rear).

Loosen mounting bolts in the reverse order as shown in the figure, below.

Fig 2: Actuator Bracket (Rear) Mounting Bolt Tightening Sequence

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A	: Bank 2
B	: Bank 1
	: Engine front

Remove front cover, camshaft sprockets, and timing chains. Refer to Exploded View .

Remove VVEL Ladder Assembly.

Loosen mounting bolts (gold color) in the reverse order as shown in the figure, below.

Fig 3: VVEL Ladder Assembly Mounting Bolt Tightening Sequence

Courtesy of NISSAN NORTH AMERICA, INC.

A	: Bank 2
B	: Bank 1
	: Engine front

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.

Remove camshaft (EXH).
Remove valve lifter, if necessary.
- Identify installation positions, and store them without mixing them up.