Infiniti FX35, FX50 (S51). Manual — part 930
EM-20
< PERIODIC MAINTENANCE >
[VQ35HR]
CAMSHAFT VALVE CLEARANCE
CAMSHAFT VALVE CLEARANCE
Inspection and Adjustment
INFOID:0000000005245121
INSPECTION
Perform inspection as follows after removal, installation or replacement of camshaft or valve-related parts, or if
there is unusual engine conditions regarding valve clearance.
In cases of removing/installing or replacing camshaft and valve-
related parts, or of unusual engine conditions due to changes in
valve clearance (found malfunctions during stating, idling or causing
noise), perform inspection as follows:
1.
Remove rocker covers (bank 1 and bank 2). Refer to
EM-50, "Removal and Installation"
2.
Measure the valve clearance as per the following:
a.
Set No. 1 cylinder at TDC of its compression stroke.
• Rotate crankshaft pulley clockwise to align timing mark
(grooved line without color) with timing indicator.
• Check that intake and exhaust cam nose on No. 1 cylinder
(engine front side of bank 1) are located as shown in the fig-
ure.
• If not, turn crankshaft one revolution (360 degrees) and align
as shown in the figure.
b.
Use a feeler gauge, measure the clearance between valve lifter
and camshaft.
: Engine front
JPBIA0164ZZ
: Timing mark (grooved line without color)
JPBIA0043ZZ
: Engine front
JPBIA0044ZZ
Valve clearance
: Refer to
.
SEM139D
CAMSHAFT VALVE CLEARANCE
EM-21
< PERIODIC MAINTENANCE >
[VQ35HR]
C
D
E
F
G
H
I
J
K
L
M
A
EM
N
P
O
• By referring to the figure, measure the valve clearances at
locations marked “
×
” as shown in the table below (locations
indicated in the figure).
• No. 1 cylinder at compression TDC
c.
Rotate crankshaft 240 degrees clockwise (when viewed from engine front) to align No. 3 cylinder at TDC
its 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.
: Engine front
Measuring position [bank 1 (A)]
No. 1 CYL.
No. 3 CYL.
No. 5 CYL.
No. 1 cylinder at com-
pression TDC
EXH (C)
×
(B)
INT (D)
×
(E)
Measuring position [bank 2 (H)]
No. 2 CYL.
No. 4 CYL.
No. 6 CYL.
No. 1 cylinder at com-
pression TDC
INT (D)
×
(F)
EXH (C)
×
(G)
JPBIA0165ZZ
1
: Crankshaft pulley
A
: Paint mark
JPBIA0166ZZ
EM-22
< PERIODIC MAINTENANCE >
[VQ35HR]
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. 3 cylinder at compression TDC
d.
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.
: 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)
×
(B)
INT (D)
×
(E)
Measuring position [bank 2 (H)]
No. 2 CYL.
No. 4 CYL.
No. 6 CYL.
No. 3 cylinder at com-
pression TDC
INT (D)
×
(F)
EXH (C)
×
(G)
JPBIA0167ZZ
1
: Crankshaft pulley
A
: Paint mark
JPBIA0166ZZ
CAMSHAFT VALVE CLEARANCE
EM-23
< PERIODIC MAINTENANCE >
[VQ35HR]
C
D
E
F
G
H
I
J
K
L
M
A
EM
N
P
O
• 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-70, "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 [bank 1 (A)]
No. 1 CYL.
No. 3 CYL.
No. 5 CYL.
No. 5 cylinder at
compression TDC
EXH (C)
×
(B)
INT (D)
×
(E)
Measuring position [bank 2 (H)]
No. 2 CYL.
No. 4 CYL.
No. 6 CYL.
No. 5 cylinder at
compression TDC
INT (D)
×
(F)
EXH (C)
×
(G)
JPBIA0168ZZ
JPBIA0169ZZ
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)
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