Infiniti G35 (V35) Sedan. Manual - part 605

CAMSHAFT VALVE CLEARANCE

EM-19

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• By referring to the figure, measure the valve clearances at

locations marked “

×

” as shown in the table below (locations

indicated in the figure).

• No. 3 cylinder at compression TDC

d.

Rotate crankshaft by 240 degrees clockwise (when viewed from engine front) to align No. 5 cylinder at
TDC of compression stroke.
NOTE:
To align cylinder No. 5 with the compression top dead center,
place matching marks (A) on the crankshaft pulley (1) side and
on the cylinder block side at a point 240

°

counterclockwise from

the compression top dead center using the hex head of the
crankshaft pulley bolt as a guide.

: Engine front

Measuring position [right bank (A)]

No. 1 CYL.

No. 3 CYL.

No. 5 CYL.

No. 3 cylinder at com-

pression TDC

EXH (C)

×

 (B)

INT (D)

×

 (E)

Measuring position [left bank (H)]

No. 2 CYL.

No. 4 CYL.

No. 6 CYL.

No. 3 cylinder at com-

pression TDC

INT (D)

×

 (F)

 

EXH (C)

 

×

 (G)

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CAMSHAFT VALVE CLEARANCE

• By referring to the figure, measure the valve clearances at

locations marked “

×

” as shown in the table below (locations

indicated in the figure).

• No. 5 cylinder at compression TDC

3.

Perform adjustment if the measured value is out of the standard. Refer to “ADJUSTMENT”.

ADJUSTMENT

• Perform adjustment depending on selected head thickness of valve lifter.
1.

Measure the valve clearance. Refer to “INSPECTION”.

2.

Remove camshaft. Refer to 

EM-65, "Removal and Installation"

.

3.

Remove valve lifters at the locations that are out of the standard.

4.

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

5.

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

: Engine front

Measuring position [right bank (A)]

No. 1 CYL.

No. 3 CYL.

No. 5 CYL.

No. 5 cylinder at 

compression TDC

EXH (C)

×

 (B)

INT (D)

×

 (E)

Measuring position [left bank (H)]

No. 2 CYL.

No. 4 CYL.

No. 6 CYL.

No. 5 cylinder at 

compression TDC

INT (D)

×

 (F)

 

EXH (C)

 

×

 (G)

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Valve lifter thickness calculation:

t = t

1

+ (C

1

– C

2

)

t

= Valve lifter thickness to be replaced

t

1

 

= Removed valve lifter thickness

C

1

= Measured valve clearance

C

2

= Standard valve clearance:

Intake

: 0.30 mm (0.012 in) 

Exhaust

: 0.33 mm (0.013 in) 

CAMSHAFT VALVE CLEARANCE

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• Thickness of new valve lifter can be identified by stamp marks

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

Available thickness of valve lifter: 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-142, "Camshaft"

.

6.

Install selected valve lifter.

7.

Install camshaft. Refer to 

EM-65, "Removal and Installation"

.

8.

Manually turn crankshaft pulley a few turns. 

9.

Make sure that the valve clearances for cold engine are within the specifications by referring to the speci-
fied values. Refer to 

EM-17, "Inspection and Adjustment"

.

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

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

A

:  Stamp

B

: thickness of valve lifter

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EM-22

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COMPRESSION PRESSURE

COMPRESSION PRESSURE

Inspection

INFOID:0000000000956233

1.

Warm up engine thoroughly. Then, stop it.

2.

Release fuel pressure. Refer to 

EC-543, "Inspection"

.

3.

Disconnect fuel pump fuse (1) from IPDM E/R (2) to avoid fuel
injection during measurement.

4.

Remove engine cover with power tool. Refer to 

EM-27, "Exploded View"

.

5.

Remove ignition coil and spark plug from each cylinder. Refer to 

EM-45, "Exploded View"

.

6.

Connect engine tachometer (not required in use of CONSULT-lll).

7.

Install compression gauge with an adapter (commercial service
tool) onto spark plug hole.

• Use the adapter whose picking up end inserted to spark plug

hole is smaller than 20 mm (0.79 in) in diameter. Otherwise, it
may be caught by cylinder head during removal.

8.

With accelerator pedal fully depressed, turn ignition switch to “START” for cranking. When the gauge
pointer stabilizes, read the compression pressure and the engine rpm. Perform these steps to check each
cylinder.

CAUTION:

Always use a fully changed battery to obtain the specified engine speed.
• If the engine speed is out of the specified range, check battery liquid for proper gravity. Check the

engine speed again with normal battery gravity. 

• If compression pressure is below minimum value, check valve clearances and parts associated with

combustion chamber (valve, valve seat, piston, piston ring, cylinder bore, cylinder head, cylinder head
gasket). After the checking, measure compression pressure again.

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PBIC0900E

a

: 20 mm (0.79 in)

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Compression pressure

: Refer to 

EM-141, "General Specification"

.