Nissan Frontier D40. Instruction — part 600
EM-132
< ON-VEHICLE MAINTENANCE >
[VQ40DE]
CAMSHAFT VALVE CLEARANCE
CAMSHAFT VALVE CLEARANCE
Valve Clearance
INFOID:0000000005274323
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. Refer to
EM-138, "Removal and Installation"
2.
Remove the air cleaner and air duct assembly. Refer to
3.
Remove rocker covers (RH and LH banks). Refer to
EM-155, "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)
*: Approximately 80
°
C (176
°
F)
AWBIA0719ZZ
SEM418G
SEM139D
Cold
Hot * (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-133
< ON-VEHICLE MAINTENANCE >
[VQ40DE]
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• 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-134
< ON-VEHICLE 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-187, "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
CAMSHAFT VALVE CLEARANCE
EM-135
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• Thickness of new valve lifter can be identified by stamp marks
on the reverse side (inside the cylinder).
Intake
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
.
Exhaust
Available thickness of valve lifter: 25 sizes with range 7.88 to 8.36 mm (0.3102 to 0.3291 in) in steps of
0.02 mm (0.0008 in) (when manufactured at factory). Refer to
.
CAUTION:
Install identification letter at the end and top, “U” and “N”, at each of proper positions. (Be care-
ful of mis-installation between intake and exhaust.)
6.
Install selected valve lifter.
7.
Install camshaft. Refer to
EM-187, "Removal and Installation"
.
8.
Instructionly 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.
10. Installation of the remaining components is in the reverse order of removal.
11. Start the engine, and check for unusual noise and vibration.
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)*
*: Approximately 20
°
C (68
°
F)
KBIA0119E
Stamp mark
Thickness
788U
7.88 mm (0.3102 in)
790U
7.90 mm (0.3110 in)
·
·
·
·
840U
8.40 mm (0.3307 in)
Stamp mark
Thickness
N788
7.88 mm (0.3102 in)
N790
7.90 mm (0.3110 in)
·
·
·
·
N836
8.36 mm (0.3291 in)
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