Infiniti FX35, FX50 (S51). Manual - part 944

EM-76

< REMOVAL AND INSTALLATION >

[VQ35HR]

CAMSHAFT

• If the calculated value exceeds the limit, replace either or both camshaft and cylinder head.

NOTE:
Camshaft brackets cannot be replaced as single parts, because there are machined together with cylinder
head. Replace whole cylinder head assembly.

Camshaft End Play

• Install a dial indicator in thrust direction on front end of camshaft.

Measure the end play of a dial indicator when camshaft is moved
forward/backward (in direction to axis).

• Measure the following parts if out of the limit.
- Dimension “A” for camshaft No. 1 journal

- Dimension “B” for cylinder head No. 1 journal bearing

• Refer to the standards above, and then replace camshaft and/or

cylinder head.

Camshaft Sprocket Runout

1.

Put V-block on precise flat table, and support No. 2 and 4 journals 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.

Measure the camshaft sprocket runout with a dial indicator.
(Total indicator reading)

• If it exceeds the limit, replace camshaft sprocket.

Valve Lifter 

Standard and limit

: Refer to 

EM-143, "Camshaft"

.

Standard and limit

: Refer to 

EM-143, "Camshaft"

.

SEM864E

Standard

: 27.500 - 27.548 mm (1.0827 - 1.0846 in)

Standard

: 27.360 - 27.385 mm (1.0772 - 1.0781 in)

KBIA2404J

Limit

: Refer to 

EM-143, "Camshaft"

.

PBIC0930E

CAMSHAFT

EM-77

< REMOVAL AND INSTALLATION >

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Check if surface of valve lifter has any wear or cracks.
• If anything above is found, replace valve lifter. Refer to 

EM-143,

"Camshaft"

.

Valve Lifter Clearance

VALVE LIFTER OUTER DIAMETER

• Measure the outer diameter at 1/2 height of valve lifter with a

micrometer (A) since valve lifter is in barrel shape.

VALVE LIFTER HOLE DIAMETER

• Measure the inner diameter of valve lifter hole of cylinder head with

an inside micrometer.

VALVE LIFTER CLEARANCE

• (Valve lifter clearance) = (Valve lifter hole diameter) – (Valve lifter outer diameter)

• If the calculated value is out of the standard, referring to each standard of valve lifter outer diameter and

valve lifter hole diameter, replace either or both valve lifter and cylinder head.

INSPECTION AFTER INSTALLATION

Inspection of Camshaft Sprocket (INT) Oil Groove

CAUTION:

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

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

EC-111,

"Diagnosis Description"

.

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

1.

Check engine oil level. Refer to 

LU-6, "Inspection"

.

2.

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

a.

Release the fuel pressure. Refer to 

EC-566, "Inspection"

.

KBIA0182E

Standard

: Refer to 

EM-143, "Camshaft"

.

(Intake and exhaust)

JPBIA0125ZZ

Standard

: Refer to 

EM-143, "Camshaft"

.

(Intake and exhaust)

SEM867E

Standard

: Refer to 

EM-143, "Camshaft"

.

(Intake and exhaust)

EM-78

< REMOVAL AND INSTALLATION >

[VQ35HR]

CAMSHAFT

b.

Disconnect ignition coil and injector harness connectors. Refer to 

EM-50, "Exploded View"

 and 

EM-40,

"Exploded View"

.

3.

Remove intake valve timing control solenoid valve. Refer to 

EM-53, "Exploded View"

.

4.

Crank engine, and then check that engine oil comes out from
intake 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 so as to prevent

the worker from injury from engine oil and so as to prevent engine oil contamination.

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

engine and vehicle. Especially, be careful no to apply engine oil to rubber parts of drive belt,
engine mounting insulator, etc. Wipe engine oil off immediately if it is splashed.

5.

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

EM-53, "Exploded View"

.

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

LU-3,

"Engine Lubrication System"

 and 

LU-3, "Engine Lubrication System Schematic"

.

6.

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

LU-3, "Engine Lubrication System"

 and 

LU-3, "Engine Lubrica-

tion System Schematic"

.

7.

After inspection, install removed parts in the reverse order.

Inspection for Leakage

The following are procedures for checking fluids leakage, lubricates leakage.

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

quantity, fill to the specified level. Refer to 

MA-12, "Fluids and Lubricants"

.

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

age 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 timing chain tensioner drops after removal/installation, slack in the guide may
generate a pounding noise during and just after engine start. However, this is normal. Noise will stop after
hydraulic pressure rises.

• Warm up engine thoroughly to check 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 to the

specified level, if necessary.

Summary of the inspection items:

*: Transmission/transaxle/CVT fluid, power steering fluid, brake fluid, etc.

1

: Valve timing control cover (bank 1)

: Engine front

JPBIA0410ZZ

Items

Before starting engine

Engine running

After engine stopped

Engine coolant

Level

Leakage

Level

Engine oil

Level

Leakage

Level

Other oils and fluid*

Level

Leakage

Level

Fuel

Leakage

Leakage

Leakage

OIL SEAL

EM-79

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OIL SEAL

VALVE OIL SEAL

VALVE OIL SEAL : Removal and Installation

INFOID:0000000005245152

REMOVAL

1.

Remove camshaft relating to valve oil seal to be removed. Refer to 

EM-107, "Exploded View"

.

2.

Remove valve lifters. Refer to 

EM-70, "Exploded View"

.

3.

Turn crankshaft until the cylinder requiring new oil seals is at TDC. This will prevent valve from dropping
into cylinder.

4.

Remove valve collet.
• Compress valve spring with the valve spring compressor [SST:

KV10116200 (J-26336-A)] (A), the attachment [SST:
KV10115900 (J-26336-20)] (C), the adapter [SST:
KV10109220 (

—

)] (B). Remove valve collet with a magnet

hand.

CAUTION:

When working, take care not to damage valve lifter holes.

5.

Remove valve spring retainer, and valve spring.

6.

Remove valve oil seal using the valve oil seal puller [SST:
KV10107902 (J-38959)] (A).

INSTALLATION

1.

Apply new engine oil on new valve oil seal joint and seal lip.

2.

Using the valve oil seal drift [SST: KV10115600 (J-38958)] (A),
press fit valve seal to height (b) shown in the figure.
NOTE:
Dimension: Height measured before valve spring seat installa-
tion

3.

Install in the reverse order of removal after this step.

FRONT OIL SEAL

FRONT OIL SEAL : Removal and Installation

INFOID:0000000005245153

REMOVAL

JPBIA0180ZZ

JPBIA0177ZZ

Intake and exhaust

: 14.3 - 14.9 mm (0.563 - 0.587 in)

JPBIA0178ZZ