Infiniti QX56 (Z62). Manual - part 661

EM-84

< REMOVAL AND INSTALLATION >

CAMSHAFT

• Move control shaft (A) to the small stopper and large stopper to

check that the control shaft functions smoothly.

CAUTION:

Turn VVEL ladder assembly upside down to prevent the drive
shaft from dropping off.

RINK CHECK FOR BACK-LASH (BONDING)

• Check that the link and the shaft of drive shaft and control shaft are

not fixed. 

• Check this by moving drive shaft and control shaft in the axial and

rotation directions.

• If there is an unusualness related to the above three items, replace VVEL ladder assembly & cylinder head

assembly.

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

INSPECTION AFTER ASSEMBLY

Inspection of Camshaft Sprocket (INT) Oil Groove

CAUTION:

• Perform this inspection only when DTC P0011, P0021 are detected in self-diagnostic results of CON-

SULT-III and it is directed according to inspection procedure of EC section. Refer to 

EC-177, "DTC

Logic"

.

• Check when engine is cold to prevent burns from the splashing engine oil.
1.

Check engine oil level. Refer to 

LU-7, "Inspection"

.

2.

Perform the following procedure to prevent the engine from being unintentionally started while checking.

a.

Release the fuel pressure. Refer to 

EC-153, "Work Procedure"

.

b.

Disconnect ignition coil and injector harness connectors.

3.

Remove valve timing control solenoid valve. Refer to 

EM-61, "Exploded View"

.

4.

Crank engine, and then check that engine oil comes out from
valve timing control solenoid valve hole (A). End crank after
checking.

WARNING:

Be careful not to touch rotating parts (drive belt, idler pul-
ley, and crankshaft pulley, etc.).

CAUTION:

• Prevent splashing by using a shop cloth to prevent the

worker from injury from engine oil and to prevent engine
oil contamination.

• Prevent splashing by using a shop cloth to prevent engine oil from being splashed to engine and

vehicle. Especially, be careful not to apply engine oil to rubber parts of drive belt, engine mount-
ing insulator, etc. Wipe engine oil out immediately if it is splashed.

: Engine front

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: Valve timing control cover (bank 2)

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CAMSHAFT

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5.

Perform the following inspection if engine oil does not come out from valve timing control solenoid valve
oil hole of the valve timing control cover.
• Remove oil filter, and then clean it. Refer to 

EM-61, "Exploded View"

.

• Clean oil groove between oil strainer and valve timing control solenoid valve. Refer to 

LU-5, "Engine

Lubrication System"

 and 

LU-6, "Engine Lubrication System Schematic"

.

6.

Remove components between valve timing control solenoid valve and camshaft sprocket, and then check
each oil groove for clogging.
• Clean oil groove if necessary. Refer to 

LU-5, "Engine Lubrication System"

 and 

LU-6, "Engine Lubrica-

tion System Schematic"

.

7.

After inspection, install removed parts in the reverse order.

Inspection for Leakage

The following are procedures for checking fluid leakage, lubricant leakage.

• Before starting engine, check oil/fluid levels including engine coolant and engine oil. If any are less than the

required quantity, fill them to the specified level. Refer to 

MA-10, "Fluids and Lubricants"

.

• Follow the procedure below to check for fuel leakage.
- Turn ignition switch to the “ON” position (with engine stopped). With fuel pressure applied to fuel piping,

check for fuel leakage at connection points.

- Start engine. With engine speed increased, check again for fuel leakage at connection points.
• Run engine to check for unusual noise and vibration.

NOTE:
If hydraulic pressure inside chain tensioner drops after removal/installation, slack in guide may generate a
pounding noise during and just after the engine start. However, this does not indicate a malfunction. The
noise will stop after hydraulic pressure rises.

• Warm up engine thoroughly to check that there is no leakage of fuel, or any oil/fluids including engine oil and

engine coolant.

• Bleed air from lines and hoses of applicable lines, such as in cooling system.
• After cooling down engine, again check oil/fluid levels including engine oil and engine coolant. Refill them to

the specified level, if necessary.

Summary of the inspection items:

* Power steering fluid, brake fluid, etc.

Items

Before starting engine

Engine running

After engine stopped

Engine coolant

Level

Leakage

Level

Engine oil

Level

Leakage

Level

Transmission /
transaxle fluid

AT & CVT Models

Leakage

Level / Leakage

Leakage

MT Models

Level / Leakage

Leakage

Level / Leakage

Other oils and fluids*

Level

Leakage

Level

Fuel

Leakage

Leakage

Leakage

EM-86

< REMOVAL AND INSTALLATION >

CYLINDER HEAD

CYLINDER HEAD

Exploded View

INFOID:0000000006289571

CAUTION:

A high degree of precision is required for a valve on the intake side. Never remove the valve related
parts unless necessary.

1.

Valve lifter (EXH)

2.

Valve collet (EXH)

3.

Valve spring retainer (EXH)

4.

Valve oil seal (EXH)

5.

Valve spring (with valve spring seat) 
(EXH)

6.

Valve guide (EXH)

7.

Spark plug

8.

Valve lifter (INT)

9.

Valve collet (INT)

10. Valve spring retainer (INT)

11.

Valve oil seal (INT)

12.

Valve spring (with valve spring seat) 
(INT)

13.  Cylinder head bolt

14. Cylinder head (bank 2)

15. Valve seat (EXH)

16. Valve (EXH)

17. Cylinder head gasket (bank 2)

18. Oil filter (for VVEL ladder assembly)

19. Cylinder block

20. Valve (INT)

21. Valve seat (INT)

22. Cylinder head gasket (bank 1)

23. Cylinder head (bank 1)

24. Engine coolant temperature sensor

A.

Comply with the installation proce-
dure when tightening. Refer to 

EM-

87, "Removal and Installation"

.

Refer to 

GI-4, "Components"

 for symbol marks in the figure.

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NOTE:
• As for replacement of parts on the intake side as shown in the exploded view, replace VVEL ladder assem-

bly & cylinder head assembly. (Only valve oil seals are replaceable as a single part.)

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

head assembly.

Removal and Installation

INFOID:0000000006289572

REMOVAL

1.

Remove the following parts:
• Rocker cover and spark plug: Refer to 

EM-33, "Exploded View"

.

• Intake manifold: Refer to 

EM-30, "Exploded View"

.

• Exhaust manifold: Refer to 

EM-40, "Exploded View"

.

• Water inlet and thermostat housing: Refer to 

CO-20, "Exploded View"

.

• Water pipe and heater pipe: Refer to 

CO-20, "Exploded View"

.

• Timing chain: Refer to 

EM-61, "Exploded View"

.

• Camshaft (EXH) and VVEL ladder assembly: Refer to 

EM-74, "Exploded View"

.

2.

Remove cylinder head.
• Loosen mounting bolts in reverse order as shown in the figure.

• Use TORX socket and power tool.

3.

Remove cylinder head gaskets.

4.

Remove oil filter (for VVEL ladder assembly) from cylinder block, if necessary.

5.

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

INSTALLATION

1.

Install oil filter (for VVEL ladder assembly) (1) in the direction
shown in the figure, if removed.
• Check that the oil filter does not protrude from the upper sur-

face of cylinder block (2) after installation.

A

:  Bank  2

B

:  Bank  1

: Engine front

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