CAMSHAFT VALVE CLEARANCE
EM-21
< PERIODIC MAINTENANCE >
[VQ40DE]
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EM
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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 EM-129, "Standard and Limit"
.
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 EM-129, "Standard and Limit"
.
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-76, "Removal and Installation"
.
8. Manually 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+ (C1– C2)
t = Valve lifter thickness to be replaced
t
1 = Removed valve lifter thickness
C
1 = Measured valve clearance
C
2 = Standard valve clearance:
Intake : 0.26 - 0.34 mm (0.010 - 0.013 in)*
Exhaust : 0.29 - 0.37 mm (0.011 - 0.015 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)
Revision: January 2013 2013 Xterra
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