Infiniti F50. Manual - part 542

CAMSHAFT

EM-55

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EM

9.

Remove adjusting shim using a small screwdriver and a mag-
netic finger.

10. Determine replacement adjusting shim size following formula.

●

Using a micrometer determine thickness of removed shim
with measured at center.

●

Calculate thickness of new adjusting shim so valve clearance
comes within specified values (Cold value).
R = Thickness of removed shim
N = Thickness of new shim
M = Measured valve clearance

Shims are available in 64 sizes from 2.32 mm (0.0913 in) to 2.95 mm (0.1161 in) in steps of 0.01
mm (0.0004 in).

●

Select new shim with thickness as close as possible to calcu-
lated value.

11. Install new shim using a suitable tool.

●

Install with the surface on which the thickness is
stamped facing down.

SEM872E

Intake

: N = R + [M 

−

 0.30 mm (0.0118 in)]*

Exhaust

: N = R + [M 

−

 0.33 mm (0.0130 in)]*

*: Approximately 20

°

 C (68

°

 F)

SEM145D

SEM873E

SEM146D

EM-56

CAMSHAFT

12. Place Tool (A) as mentioned in steps 4 and 5.

13. Remove Tool (B).

14. Remove Tool (A).

15. Recheck valve clearance. (Cold value)
16. Finally check valve clearance with warmed up engine. (Hot

value)

Valve clearance:

Unit: mm (in)

*: Approximately 20

°

C (68

°

F)

SEM874E

Cold* (reference data)

Hot 

   Intake

0.26 - 0.34 (0.010 - 0.013)

0.32 - 0.40 (0.013 - 0.016)

 Exhaust

0.29 - 0.37 (0.011 - 0.015)

0.33 - 0.41 (0.013 - 0.016)

OIL SEAL

EM-57

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OIL SEAL

PFP:00100

Removal and Installation of Valve Oil Seal

EBS00JX7

REMOVAL

1.

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

EM-46, "CAMSHAFT"

 .

2.

Remove adjusting shims and valve lifters. Refer to 

EM-46, "CAMSHAFT"

 .

●

Correctly identify location where each part is installed. Keep parts in an organized way to avoid mixing
them up.

3.

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

4.

Remove valve collet. 

●

Compress valve spring with valve spring compressor.
Remove valve collet with magnet driver.

5.

Remove valve spring retainer and valve spring.

CAUTION:

Do not remove valve spring seat from valve spring.

6.

Remove valve oil seal using valve oil seal puller (special service
tool).

INSTALLATION

1.

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

2.

Install valve oil seal.

●

Install with valve oil seal drift to match dimension in illustra-
tion.

3.

Perform steps in the reverse order of removal for the following
operations.

PBIC0071E

PBIC0072E

PBIC0073E

EM-58

OIL SEAL

Removal and Installation of Front Oil Seal

EBS00JX8

REMOVAL

1.

Remove the following parts:

●

Undercover

●

Drive belt; Refer to 

EM-12, "DRIVE BELTS"

 .

●

Cooling fan; Refer to 

CO-18, "COOLING FAN"

 .

2.

Set ring gear stopper (SST).

3.

Remove crankshaft pulley.

4.

Remove front oil seal using a suitable tool.

CAUTION:

Be careful not to damage front timing chain case and crank-
shaft.

INSTALLATION

1.

Install front oil seal onto front cover. 

●

Apply engine oil on new front oil seal.

●

Using oil seal drift or drift with 54 mm (2.13 in) diameter, force
fit the seal until it levels with the front end surface of front
cover.

PBIC1656E

SBIA0358E

SBIA0359E

SBIA0359E