Sentra XE L4-1597cc 1.6L DOHC MFI (GA16DE) (1997)
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Piston Ring: Testing and Inspection
SIDE CLEARANCE
Measure the side clearance as shown.
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Top ring 0.040 - 0.080 mm (0.0016 - 0.0031 inch)
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Maximum limit of side clearance is 0.1 mm (0.004 inch)
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If out of specification, replace piston ring. If the clearance exceeds maximum limit with new ring, replace piston.
END GAP
Measure the end gap as shown.
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Top ring 0.20 - 0.44 mm (0.0079 - 0.0173 inch)
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Oil ring 0.20 - 0.69 mm (0.0079 - 0.0272 inch)
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Maximum limit of ring gap is 0.49 mm (0.0193 inch) for the top ring and 0.69 mm (0.0272 inch) for the oil ring.
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If out of specification, replace piston ring. If gap exceeds maximum limit with new ring, rebore cylinder and use oversized piston and piston rings.
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When replacing the piston, check the cylinder block surface for scratches or seizure.
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If scratches or seizure is found, hone or replace the cylinder block.
