Infiniti M45 (Y34). Manual - part 530

CAMSHAFT

EM-57

C

D

E

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EM

CAUTION:

If inspection was carried out with cold engine, check that values with fully warmed up engine
are still within specifications.

7.

Turn crankshaft pulley clockwise by 270 degrees from the posi-
tion of No. 1 cylinder compression TDC to obtain No. 3 cylinder
compression TDC. 

8.

By referring to the figure, measure valve clearances at locations
marked “X” as shown in the table below (locations indicated with
white arrow in figure) 

●

No.3 cylinder compression TDC

9.

Turn crankshaft pulley clockwise by 90 degrees from the posi-
tion of No. 3 cylinder compression TDC (clockwise by 360
degrees from the position of No. 1 cylinder compression TDC) to
align No.6 cylinder at TDC of its compression stroke. 

PBIC2346E

Measuring position (right bank)

No.2 CYL

No.4 CYL

No.6 CYL

No. 8 CYL

No. 3 cylinder at TDC

 EXH

 

×

INT

 

×

Measuring position (left bank)

No.1 CYL

No. 3 CYL

No. 5 CYL

No. 7 CYL

No. 3 cylinder at TDC

INT

×

×

 

EXH

×

×

PBIC0823E

PBIC2346E

EM-58

CAMSHAFT

10. By referring to the figure, measure valve clearances at locations

marked “

×

” as shown in the table below. 

●

No. 6 cylinder compression TDC

11. For measured value are out of the standard, perform adjustment. Refer to 

EM-58, "ADJUSTMENT"

 .

ADJUSTMENT

NOTE:
Adjust valve clearance while engine is cold.

1.

Turn crankshaft to position cam nose on camshaft of valve that
must be adjusted upward.

2.

Thoroughly wipe off engine oil around adjusting shim using a
rag.

3.

Using a extra-fine screwdriver, turn the round hole of the adjust-
ing shim in the direction of the arrow.

CAUTION:

Perform (the above procedure) while camshaft do not con-
tact with adjusting shim.

4.

Compress valve spring by snapping camshaft using the cam-
shaft pliers (SST), by pulling camshaft to the same direction of
the arrow and by pushing valve lifter down.

CAUTION:

Be careful not to damage cam surface with the camshaft pli-
ers (SST).

5.

Place the lifter stopper (SST) between camshaft and the edge of
the valve lifter to retain valve lifter.

CAUTION:

●

The lifter stopper (SST) must be placed as close to cam-
shaft bracket as possible.

●

Be careful not to damage cam surface with the lifter stop-
per (SST).

6.

Remove the camshaft pliers (SST).

CAUTION:

When returning the camshaft pliers (SST) quickly, the lifter stopper (SST) hit and damages the
journal portion of camshaft. Therefore turn the camshaft pliers slowly.

Measuring position (right bank)

No. 2 

CYL.

No. 4 

CYL.

No. 6 

CYL.

No. 8 

CYL.

No. 6 cylinder at TDC

 EXH

×

 

×

INT

 

×

PBIC0824E

PBIC0047E

PBIC2276E

PBIC1565E

CAMSHAFT

EM-59

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7.

Blow air into the hole to separate adjusting shim from valve lifter.

CAUTION:

When blowing, use goggles to protect your eye.

8.

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

9.

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.

PBIC1566E

PBIC2359E

Intake

: N = R + [M 

−

 0.30 mm (0.0118 in)]*

Exhaust

: N = R + [M 

−

 0.33 mm (0.0130 in)]*

*: Reference data at approximately 20

°

 C (68

°

 F)

SEM145D

SEM873E

EM-60

CAMSHAFT

10. Install new shim using a suitable tool.

●

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

11. Place the camshaft pliers (SST) as mentioned in step 4.

12. Remove the lifter stopper (SST).

13. Remove the camshaft pliers (SST).

14. Rotate crankshaft 2 to 3 turns by hand.

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

Valve clearance:

Unit: mm (in)

*: Reference data at approximately 20

°

C (68

°

F)

PBIC1568E

PBIC1569E

Hot

Cold* (reference data)

   Intake

0.304 - 0.416 (0.012 - 0.016)

0.26 - 0.34 (0.010 - 0.013)

 Exhaust

0.308 - 0.432 (0.012 - 0.017)

0.29 - 0.37 (0.011 - 0.015)