Nissan Qashqai (2007-2010). Manual — part 18
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SPARK PLUG
3.
Remove spark plug with a spark plug wrench (commercial ser-
vice tool).
INSTALLATION
Installation is the reverse order of removal.
Inspection
INFOID:0000000000893833
INSPECTION AFTER REMOVAL
Use the standard type spark plug for normal condition.
CAUTION:
• Never drop or shock spark plug.
• Never use a wire brush for cleaning.
• If plug tip is covered with carbon, spark plug cleaner may be
used.
• Checking and adjusting plug gap is not required between
change intervals.
PBIC3871E
Spark plug (Standard type):
Refer to
.
Cleaner air pressure:
Less than 588 kPa (6 kg/cm
2
, 85 psi)
Cleaning time:
Less than 20 seconds
SMA773C
JPBIA0031ZZ
CAMSHAFT VALVE CLEARANCE
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CAMSHAFT VALVE CLEARANCE
Inspection and Adjustment
INFOID:0000000000893834
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.
1.
Remove rocker cover. Refer to
2.
Measure the valve clearance with the following procedure:
a.
Set No. 1 cylinder at TDC of its compression stroke.
• Rotate crankshaft pulley (2) clockwise and align TDC mark
(without paint mark) (A) to timing indicator (1) on front cover.
• At the same time, make sure that both intake and exhaust cam
noses of No. 1 cylinder face outside as shown in the figure.
• If they do not face outside, rotate crankshaft pulley once more
(360 degrees) and align as shown in the figure.
b.
Use a feeler gauge, measure the clearance between valve lifter
and camshaft.
• By referring to the figure, measure the valve clearances at
locations marked “
×
” as shown in the table below [locations
indicated with black arrow (
) in the figure] with a feeler
gauge.
B
: White paint mark (Not use for service)
PBIC3673E
1
: Camshaft (INT)
2
: Camshaft (EXH)
: Engine front
PBIC3359J
Valve Clearance:
SEM139D
A
: No. 1 cylinder compression TDC
: Engine front
PBIC3707E
EM-22
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CAMSHAFT VALVE CLEARANCE
c.
Rotate crankshaft pulley (2) one revolution (360 degrees) and
align TDC mark (without paint mark) (A) to timing indicator (1) on
front cover.
• By referring to the figure, measure the valve clearance at loca-
tions marked “
×
” as shown in the table below [locations indi-
cated with black arrow (
) in the figure] with a feeler gauge.
3.
If out of standard, perform adjustment. Refer to “ADJUSTMENT”.
ADJUSTMENT
• Perform adjustment depending on selected head thickness of valve lifter.
1.
Remove camshaft. Refer to
2.
Remove valve lifters at the locations that are out of the standard.
3.
Measure the center thickness of the removed valve lifters with a
micrometer (A).
4.
Use the equation below to calculate valve lifter thickness for replacement.
Measuring position
No. 1 CYL.
No. 2 CYL.
No. 3 CYL.
No. 4 CYL.
Measurement po-
sition
EXH
×
×
INT
×
×
B
: White paint mark (Not use for service)
PBIC3673E
A
: No. 4 cylinder compression TDC
: Engine front
Measuring position
No. 1 CYL.
No. 2 CYL.
No. 3 CYL.
No. 4 CYL.
Measurement
point
EXH
×
×
INT
×
×
PBIC3708E
PBIC3195J
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 (B) can be identified by stamp
mark (A) on the reverse side (inside the cylinder).
• Stamp mark “300” indicates 3.00 mm (0.118 in) in thickness.
NOTE:
Available thickness of valve lifter: 26 sizes range 3.00 to 3.50 mm (0.1181 to 0.1378 in) in steps of 0.02
mm (0.0008 in) (when manufactured at factory). Refer to
5.
Install the selected valve lifter.
6.
Install camshaft. Refer to
.
7.
Manually rotate crankshaft pulley a few rotations.
8.
Make sure that valve clearances for cold engine are within specifications by referring to the specified val-
ues.
9.
Install all removed parts in the reverse order of removal.
10. Warm up the engine, and check for unusual noise and vibration.
PBIC3196J
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