Sentra L4-1.8L (QG18DE) (2004)
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7. Keep adjusting shim slightly up from the valve lifter. Remove adjusting shim using Tool and a magnetic finger.
8. Determine replacement adjusting shim size using the following formula.
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Use a micrometer to determine thickness (t1) of removed shim at camshaft contact face (around center).
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Use t1 + (C1-C2) to calculate thickness of new adjusting shim so valve clearance comes within specified values.
t1 = Thickness of removed shim
C1 = Measured valve clearance
C2 = Standard valve clearance
Hot engine:
Intake: 0.32 - 0.40 mm (0.013 - 0.016 inch)
Exhaust: 0.37 - 0.45 mm (0.015- 0.018 inch)
Reference values with cold engine:
Intake: 0.25 - 0.33 mm (0.010 - 0.013 inch)
Exhaust: 0.32 - 0.40 mm (0.013 - 0.016 inch)
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Thickness of new adjusting shim is indicated with stamped mark on its back.
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Shims are available in 50 sizes from 2.00 mm (0.0787 inch) to 2.98 mm (0.1173 inch), in steps of 0.02 mm (0.0008 inch).
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Select the closest size shim to the calculated thickness.
9. Install new shim using a suitable tool. Install with the surface on which the thickness is stamped facing down.