Sentra L4-1.8L (QG18DE) SULEV (2003)
Valve Clearance: Testing and Inspection
Valve Clearance
NOTE: The following procedure is applicable when: components related to camshafts or valves are removed, installed, or replaced. Driveability
concerns (poor starting, poor idling, noise) are caused by valve clearance aging.
1. Warm engine and stop.
2. Remove RH splash cover.
3. Remove the rocker cover.
4. Remove all of the spark rings.
5. Set No. 1 cylinder at TDC on its compression stroke.
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Align pointer with TDC mark on crankshaft pulley.
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Check that both intake and exhaust cam noses on No.1 cylinder face outward.
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If not, turn crankshaft one revolution (360°) and align as described above.
NOTE: Or, valves to be checked when No. 4 cylinder is at TDC of its compression stroke can be checked first following step 8.
6. Referring to figure, measure valve clearances of valves with x in table using. a thickness clause.
Using a feeler gauge, measure clearance between valve lifter and camshaft.