Infiniti G37 Coupe. Manual - part 630

CAMSHAFT

EM-95

< DISASSEMBLY AND ASSEMBLY >

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2.

Measure the camshaft sprocket (EXH) runout with a dial indica-
tor. (Total indicator reading)

3.

If it exceeds the limit, replace camshaft sprocket (EXH).

Valve Lifter (EXH)

• Check if surface of valve lifter has any wear or crack.
• If wear or crack is found, replace valve lifter (EXH). Refer to 

EM-

139, "Camshaft"

.

Valve Lifter Clearance (EXH)

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 VVEL ladder assembly & cylinder head
assembly.

Limit

: Refer to 

EM-139, "Camshaft"

.

PBIC0930E

KBIA0182E

Standard

: Refer to 

EM-139, "Camshaft"

.

JPBIA0125ZZ

Standard

: Refer to 

EM-139, "Camshaft"

.

SEM867E

Standard

: Refer to 

EM-139, "Camshaft"

.

EM-96

< DISASSEMBLY AND ASSEMBLY >

CAMSHAFT

NOTE:
Cylinder head assembly cannot be replaced as a single part, because it is machined together with VVEL lad-
der assembly.

INSPECTION AFTER REMOVAL (INTAKE SIDE)

Drive Shaft End Play

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

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

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

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

• If it exceeds the limit, replace VVEL ladder assembly & cylinder

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

Camshaft Sprocket (INT) Runout

1.

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

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 (INT) runout with a dial indicator. (Total indicator reading)

3.

If it exceeds the limit, replace camshaft sprocket (INT).

Valve Lifter (INT)

• Check if surface of valve lifter has any wear or crack.
• If wear or crack is found, replace VVEL ladder assembly & cylinder

head assembly. Refer to 

EM-139, "Camshaft"

.

NOTE:
Since the valve lifter (INT) cannot be replaced by the piece, VVEL
ladder assembly & cylinder head assembly replacement are
required.

Valve Lifter Clearance (INT)

VALVE LIFTER OUTER DIAMETER

Standard and limit

: Refer to 

EM-139, "Camshaft"

.

JPBIA1337ZZ

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-139, "Camshaft"

.

KBIA0182E

CAMSHAFT

EM-97

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• Measure the outer diameter at 1/2 height of valve lifter (INT) 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, replace VVEL ladder assembly & cylinder head assembly.

NOTE:
Since the valve lifter (INT) cannot be replaced by the piece, VVEL ladder assembly & cylinder head assem-
bly replacement are required.

VVEL Ladder Assembly

DRIVE SHAFT OPERATIONAL CHECK

• Hold the both ends of the drive shaft (A) and rotate it to check that

it rotates smoothly.

CAUTION:

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

CONTROL SHAFT OPERATIONAL CHECK

Standard

: Refer to 

EM-139, "Camshaft"

.

JPBIA0125ZZ

Standard

: Refer to 

EM-139, "Camshaft"

.

SEM867E

Standard

: Refer to 

EM-139, "Camshaft"

.

JPBIA1327ZZ

EM-98

< DISASSEMBLY AND ASSEMBLY >

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, replace VVEL ladder assembly & cylinder head assem-

bly.

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

INSPECTION AFTER INSTALLATION

Inspection of Camshaft Sprocket (INT) Oil Groove

CAUTION:

• Perform this inspection only when DTC P0011 is detected in self-diagnostic results of CONSULT-III

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

EC-107, "Diagnosis

Description"

.

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

1.

Check engine oil level. Refer to 

LU-6, "Inspection"

.

2.

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

a.

Release the fuel pressure. Refer to 

EC-601, "Inspection"

.

b.

Disconnect ignition coil and injector harness connectors. Refer to 

EM-45, "Exploded View"

.

3.

Remove intake valve timing control solenoid valve. Refer to 

EM-48, "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 to prevent the

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

JPBIA1328ZZ

JPBIA1329ZZ

1

: Intake valve timing control cover (bank 1)

: Engine front

JPBIA0410ZZ