Infiniti G37 Coupe. Manual — part 611
CAMSHAFT VALVE CLEARANCE
EM-19
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Mark a position 240 degrees (b) from a corner of the hexagonal
part of crankshaft pulley mounting bolt as shown in the figure.
Use the hexagonal part as a guide.
• 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
c.
Rotate crankshaft 240 degrees clockwise (when viewed from engine front) to align No. 5 cylinder at TDC
of compression stroke.
NOTE:
Mark a position 240 degrees (b) from a corner of the hexagonal
part of crankshaft pulley mounting bolt as shown in the figure.
Use the hexagonal part as a guide.
1
: Crankshaft pulley
A
: Paint mark
JPBIA0166ZZ
: Engine front
Measuring position [bank 1 (A)]
No. 1 CYL.
No. 3 CYL.
No. 5 CYL.
No. 3 cylinder at com-
pression TDC
EXH
×
(C)
INT
×
(D)
Measuring position [bank 2 (B)]
No. 2 CYL.
No. 4 CYL.
No. 6 CYL.
No. 3 cylinder at com-
pression TDC
INT
×
(E)
EXH
×
(F)
JPBIA1335ZZ
1
: Crankshaft pulley
A
: Paint mark
JPBIA0166ZZ
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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 or replacement if the measured value is out of the standard.
• Refer to “CAMSHAFT (EXH) VALVE CLEARANCE ADJUSTMENT”. (Exhaust side)
• Replace VVEL ladder assembly & cylinder head assembly. Refer to
. (Intake
side)
CAUTION:
Never adjust valve clearance on the intake side.
NOTE:
Since the valve lifter (INT) cannot be replaced by the piece, VVEL ladder assembly & cylinder head
assembly replacement are required.
CAMSHAFT (EXH) VALVE CLEARANCE ADJUSTMENT
• Perform adjustment depending on selected head thickness of valve lifter (EXH).
CAUTION:
Never adjust valve clearance on the intake side.
1.
Measure the valve clearance. Refer to “INSPECTION”.
2.
Remove VVEL ladder assembly and camshaft (EXH). Refer to
EM-84, "Disassembly and Assembly"
.
CAUTION:
Never loosen adjusting bolts and mounting bolts (black color) of VVEL ladder assembly.
3.
Remove valve lifter (EXH) at the locations that are out of the standard.
4.
Measure the center thickness of the removed valve lifters (EXH)
with a micrometer (A).
5.
Use the equation below to calculate valve lifter (EXH) thickness for replacement.
: Engine front
Measuring position [bank 1 (A)]
No. 1 CYL.
No. 3 CYL.
No. 5 CYL.
No. 5 cylinder at
compression TDC
EXH
×
(C)
INT
×
(D)
Measuring position [bank 2 (B)]
No. 2 CYL.
No. 4 CYL.
No. 6 CYL.
No. 5 cylinder at
compression TDC
INT
×
(E)
EXH
×
(F)
JPBIA1336ZZ
JPBIA0169ZZ
Valve lifter (EXH) thickness calculation:
t = t
1
+ (C
1
– C
2
)
t
= Valve lifter (EXH) thickness to be replaced
CAMSHAFT VALVE CLEARANCE
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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 788T 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
6.
Install selected valve lifter (EXH).
7.
Install VVEL ladder assembly and camshaft (EXH). Refer to
EM-84, "Disassembly and Assembly"
.
8.
Manually turn crankshaft pulley a few turns.
9.
Check that the valve clearances for cold engine are within the specifications by referring to the specified
values. Refer to
EM-17, "Inspection and Adjustment"
.
10. Install all removed parts in the reverse order of removal.
11. Warm up the engine, and check for unusual noise and vibration.
t
1
= Removed valve lifter (EXH) thickness
C
1
= Measured valve clearance
C
2
= Standard valve clearance:
Exhaust
: 0.33 mm (0.013 in)
A
: Stamp
B
: Thickness of valve lifter (EXH)
JPBIA0170ZZ
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COMPRESSION PRESSURE
COMPRESSION PRESSURE
Inspection
INFOID:0000000001547619
1.
Warm up engine thoroughly. Then, stop it.
2.
Release fuel pressure. Refer to
.
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
.
5.
Remove ignition coil and spark plug from each cylinder. Refer to
.
6.
Connect engine tachometer (not required in use of CONSULT-III).
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:
• Measure a six-cylinder under the same conditions since a measurement depends on measure-
ment conditions (engine water temperature, etc.).
• 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.
JMBIA0021ZZ
PBIC0900E
a
: 20 mm (0.79 in)
JPBIA0171ZZ
Compression pressure
: Refer to
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