NSX-T V6-3.0L DOHC (VTEC) (1998)
Piston Ring: Service and Repair
END GAP
1. Using a piston, push a new ring into the cylinder bore 15 - 20 mm (0.6 - 0.8 inch) from the bottom.
2. Measure the piston ring end-gap with a feeler gauge:
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If the gap is too small, check to see if you have the proper rings for your engine.
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If the gap is too large, recheck the cylinder bore diameter against the wear limits. If the bore is over limit, the cylinder block must be rebored.
Piston Ring End-Gap:
Top Ring
M/T:
Standard (New): 0.20 - 0.30 mm (0.008 - 0.012 inch)
Service Limit: 0.50 mm (0.020 inch)
A/T:
Standard (New): 0.25 - 0.40 mm (0.010 - 0.016 inch)
Service Limit: 0.60 mm (0.024 inch)
Second Ring
Standard (New): 0.35 - 0.50 mm (0.014 - 0.020 inch)
Service Limit: 0.75 mm (0.03 inch)
Oil Ring
Standard (New): 0.20 - 0.70 mm (0.008 - 0.028 inch)
Service Limit: 0.80 mm (0.031 inch)
REPLACEMENT
1. Using a ring expander, remove the old piston rings.
2. Clean all ring grooves thoroughly.
NOTE:
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Use a squared-off broken ring or ring groove cleaner with blade to fit piston grooves.
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Top and 2nd ring grooves are 1.2 mm (0.05 inch) wide and the oil ring groove is M/T: 2.5 mm (0.10 inch), A/T: 2.8 mm (0.11 inch) wide.
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File down the blade if necessary.
CAUTION: Do not use a wire brush to clean the ring grooves, or cut ring grooves deeper with a cleaning tool.