Piston Ring

END GAP [1]
Top 0.20-0.25 mm (0.008-0.010 inch)
Second 0.30-0.50 mm (0.012-0.020 inch)
Oil 0.40-1.40 mm (0.016-0.055 inch)

SIDE CLEARANCE
Nominal
Compression
Top 0.04-0.075 mm (0.0016-0.0030 inch)
Second 0.02-0.052 mm (0.0016-0.0033 inch)
Oil Snug Fit
Limit (Maximum)
Compression 0.10 mm (0.004 inch)

[1] Specification 82.4 mm diameter gauge.