QX4 2WD V6-3.5L (VQ35DE) (2003)
Valve Clearance: Adjustments
ADJUSTING
Adjust valve clearance while engine is cold.
Perform adjustment by selecting head thickness of valve lifter (Adjusting shims are not used).
1. Remove camshaft.
2. Remove valve lifter at location where measured value is outside standard.
3. Measure center thickness of removed valve lifter with micrometer.
4. Use equation below to calculate valve lifter thickness for replacement. Valve lifter thickness calculation:
Thickness of replacement valve lifter = t1 + (C1 - C2)
t1 = Thickness of removed valve lifter
C1 = Measured valve clearance
C2 = Standard valve clearance:
Intake: 0.30 mm (0.012 inch)
Exhaust: 0.33 mm (0.013 inch)
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Thickness of new valve lifter can be identified by stamp mark on reverse side (inside cylinder).
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Available thickness of valve lifter (Factory setting): 7.88 - 8.40 mm (0.3102 - 0.3307 inch) [in 0.02 mm (0.0008 inch) step] in 27 sizes
(Intake/Exhaust).
5. Install selected valve lifter.
6. Install camshaft.
7. Rotate crankshaft a few turns by hand.
8. Confirm that valve clearance is within standard.
9. After repair, confirm that valve clearance is within standard with engine warmed-up.
Valve clearance