Infiniti FX35, FX50 (S51). Manual - part 984

EM-236

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[VK50VE]

CAMSHAFT

Align matching marks (B) of VVEL control shaft position sensor
and upper housing.
• Face connector toward matching mark (A).

Temporarily tighten bolt.

Adjust VVEL control shaft position sensor after setting the engine assembly in the vehicle. Refer to

EC-

583, "VVEL CONTROL SHAFT POSITION SENSOR ADJUSTMENT : Description"

CAUTION:

Be sure to adjust VVEL control shaft position sensor.

After adjusting VVEL control shaft position sensor, tighten bolts to the specified torque.

Install actuator cover.

Inspect the valve clearance. Refer to

EM-169, "Inspection"

10. Install in the reverse order of removal.

Inspection

INFOID:0000000005245255

CAMSHAFT (EXH) VALVE CLEARANCE ADJUSTMENT

• Perform adjustment depending on selected head thickness of valve lifter (EXH).

Measure the valve clearance. Refer to

EM-169, "Inspection"

Remove VVEL ladder assembly and camshaft (EXH). Refer to

EM-228, "Disassembly and Assembly"

CAUTION:

Never loosen adjusting bolts and mounting bolts (black color) of VVEL ladder assembly.

Remove valve lifter (EXH) at the locations that are out of the standard.

Measure the center thickness of the removed valve lifters (EXH)
with a micrometer (A).

Use the equation below to calculate valve lifter (EXH) thickness for replacement.

JPBIA2142ZZ

JPBIA0169ZZ

CAMSHAFT

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• Thickness of new valve lifter (EXH) can be identified by stamp

marks on the reverse side (inside the cylinder).
Stamp mark 788 indicates 7.88 mm (0.3102 in) in thickness.

Available thickness of valve lifter (EXH): 27 sizes with range 7.88 to 8.40 mm (0.3102 to 0.3307 in) in
steps of 0.02 mm (0.0008 in) (when manufactured at factory). Refer to

EM-283, "Camshaft"

Install selected valve lifter (EXH).

Install VVEL ladder assembly and camshaft (EXH). Refer to

EM-228, "Disassembly and Assembly"

Manually turn crankshaft pulley a few turns.

Check that the valve clearances for cold engine are within the specifications by referring to the specified
values. Refer to

EM-169, "Inspection"

10. Install all removed parts in the reverse order of removal.

11. Warm up the engine, and check for unusual noise and vibration.

INSPECTION AFTER DISASSEMBLY (EXHAUST SIDE)

Camshaft (EXH) Runout

Put V-block on precise flat table, and support No. 2 and 5 jour-
nals of camshaft.

CAUTION:

Never support No. 1 journal (on the side of camshaft
sprocket) because it has a different diameter from the other
four locations.

Set a dial indicator vertically to No. 3 journal.

Turn camshaft (EXH) to one direction with hands, and measure
the camshaft runout on a dial indicator. (Total indicator reading)

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

Camshaft (EXH) Cam Height

Valve lifter (EXH) thickness calculation:

t = t

+ (C

– C

)

= Valve lifter (EXH) thickness to be replaced

= Removed valve lifter (EXH) thickness

= Measured valve clearance

= Standard valve clearance:

Exhaust

: 0.33 mm (0.013 in)

: Stamp

: Thickness of valve lifter (EXH)

JPBIA0170ZZ

Standard and limit

: Refer to

EM-283, "Camshaft"

PBIC0929E

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CAMSHAFT

• Measure the camshaft (EXH) cam height with a micrometer.

• If wear exceeds the limit, replace camshaft (EXH).

Camshaft (EXH) Journal Oil Clearance

CAMSHAFT (EXH) JOURNAL DIAMETER

• Measure the outer diameter of camshaft (EXH) journal with a

micrometer (A).

VVEL LADDER ASSEMBLY (EXH SIDE) INNER DIAMETER

• Tighten VVEL ladder assembly bolts to the specified torque. Refer to “ASSEMBLY” for the tightening proce-

dure.

• Measure inner diameter (A) of VVEL ladder assembly (EXH side)

with a bore gauge.

CAMSHAFT (EXH) JOURNAL OIL CLEARANCE

• (Oil clearance) = [VVEL ladder assembly (EXH side) inner diameter] – [Camshaft (EXH) journal diameter].

• If the calculated value exceeds the limit, replace either or both camshaft (EXH) and 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.

Camshaft (EXH) End Play

Standard and limit

: Refer to

EM-283, "Camshaft"

EMQ0072D

Standard

: Refer to

EM-283, "Camshaft"

JPBIA0122ZZ

Standard

: Refer to

EM-283, "Camshaft"

PBIC1645E

Standard and limit

: Refer to

EM-283, "Camshaft"

CAMSHAFT

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

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

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

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

• Refer to the standards above, and then replace camshaft (EXH)

and/or 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 (EXH) Runout

Put V-block on precise flat table, and support No. 2 and 5 journals of camshaft (EXH).

CAUTION:

Never support No. 1 journal (on the side of camshaft sprocket) because it has a different diameter
from the other four locations.

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

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-

283, "Camshaft"

Valve Lifter Clearance (EXH)

VALVE LIFTER OUTER DIAMETER