Nissan Frontier. Instruction — part 736
SPARK PLUG
EM-133
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[VQ40DE]
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• Checking and adjusting spark plug gap is not required between
change intervals.
INSTALLATION
Installation is in the reverse order of removal.
CAUTION:
Do not drop or shock the spark plug.
*: Always check with the Parts Department for the latest parts information.
Cleaner air pressure
: Less than 588 kPa (6 kg/cm
2
, 85 psi)
Cleaning time
: Less than 20 seconds
SMA806CA
Make
NGK
Standard type*
DILFR5A-11
Gap (nominal)
1.1 mm (0.043 in)
EM-134
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[VQ40DE]
CAMSHAFT VALVE CLEARANCE
CAMSHAFT VALVE CLEARANCE
Valve Clearance
INFOID:0000000009478104
INSPECTION
NOTE:
Perform the following inspection after removal, installation or replacement of camshaft or valve-related parts,
or if there are unusual engine conditions due to changes in valve clearance over time (starting, idling, and/or
noise).
1. Remove the engine room cover using power tool. Refer to
EM-140, "Removal and Installation"
.
2. Remove the air cleaner and air duct assembly. Refer to
EM-141, "Removal and Installation"
3. Remove rocker covers (RH and LH banks). Refer to
EM-158, "Removal and Installation"
.
4. Measure the valve clearance as follows:
a. Set No. 1 cylinder at TDC of its compression stroke.
• Rotate crankshaft pulley clockwise to align timing mark (A)
(grooved line without color) with timing indicator (B).
• Make sure that intake and exhaust cam noses on No. 1 cylin-
der (engine front side of RH bank) are located as shown.
• If not, rotate crankshaft one revolution (360
°) and align as
shown.
b. Use feeler gauge, measure the clearance between valve lifter
and camshaft.
Valve Clearance
Unit: mm (in)
1
: Approximately 20
°C (68°F)
AWBIA0719ZZ
SEM418G
SEM139D
Cold
1
(reference data)
Hot
2
(reference data)
Intake
0.26 - 0.34 (0.010 - 0.013)
0.304 - 0.416 (0.012 - 0.016)
Exhaust
0.29 - 0.37 (0.011 - 0.015)
0.308 - 0.432 (0.012 - 0.017)
CAMSHAFT VALVE CLEARANCE
EM-135
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2
: Approximately 80
°C (176°F)
• Measure the valve clearances at locations marked “
×” as
shown in the table below (locations indicated in the illustration)
with feeler gauge.
• No. 1 cylinder at compression TDC
c. Rotate crankshaft by 240
° clockwise (when viewed from engine
front) to align No. 3 cylinder at TDC of its compression stroke.
NOTE:
Crankshaft pulley bolt flange has a stamped line every 60
°. They
can be used as a guide to rotation angle.
• Measure the valve clearances at locations marked “
×” as
shown in the table below (locations indicated in the illustration)
with feeler gauge.
• No. 3 cylinder at compression TDC
Measuring position (RH bank)
No. 1 CYL.
No. 3 CYL.
No. 5 CYL.
No. 1 cylinder at
compression TDC
EXH
×
INT
×
Measuring position (LH bank)
No. 2 CYL.
No. 4 CYL.
No. 6 CYL.
No. 1 cylinder at
compression TDC
INT
×
EXH
×
PBIC2054E
PBIC2916E
Measuring position (RH bank)
No. 1 CYL.
No. 3 CYL.
No. 5 CYL.
No. 3 cylinder at
compression TDC
EXH
×
INT
×
Measuring position (LH bank)
No. 2 CYL.
No. 4 CYL.
No. 6 CYL.
No. 3 cylinder at
compression TDC
INT
×
EXH
×
PBIC2055E
EM-136
< PERIODIC MAINTENANCE >
[VQ40DE]
CAMSHAFT VALVE CLEARANCE
d. Rotate crankshaft by 240
° clockwise (when viewed from engine
front) to align No. 5 cylinder at TDC of compression stroke.
• Measure the valve clearances at locations marked “
×” as
shown in the table below (locations indicated in the illustration)
with feeler gauge.
• No. 5 cylinder at compression TDC
5. For the measured value out of the standard, perform adjustment.
ADJUSTMENT
• Perform adjustment depending on selected head thickness of valve lifter.
1. Measure the valve clearance.
2. Remove camshaft. Refer to
EM-193, "Removal and Installation"
3. Remove valve lifters at the locations that are out of the standard.
4. Measure the center thickness of removed valve lifters with
micrometer.
5. Use the equation below to calculate valve lifter thickness for replacement.
PBIC2916E
Measuring position (RH bank)
No. 1 CYL.
No. 3 CYL.
No. 5 CYL.
No. 5 cylinder at
compression TDC
EXH
×
INT
×
Measuring position (LH bank)
No. 2 CYL.
No. 4 CYL.
No. 6 CYL.
No. 5 cylinder at
compression TDC
INT
×
EXH
×
PBIC2056E
KBIA0057E
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