Piston Ring, Engine

Compression Ring
End Gap [1]
Production Top 0.23-0.38 mm (0.0900-0.0150 inch)
Production 2nd 0.044-0.064 mm (0.0017-0.0025 inch)
Service Top (max.) 0.23-0.38 mm (0.0090-0.0149 inch)
Service 2nd 0.044-0.064 mm (0.0017-0.0025 inch)
Groove Clearance
Production Top 0.040-0.085 mm (0.0016-0.0033 inch)
Production 2nd 0.040-0.080 mm (0.0016-0.0031 inch)
Service Top (max.) 0.040-0.085 mm (0.0016-0.0034 inch)
Service 2nd (max.) 0.040-0.080 mm (0.0016-0.0031 inch)

Oil Ring
Groove Clearance
Production 0.010-0.22 mm (0.0004-0.0087 inch)
Service Limit (max.) 0.010-0.220 mm (0.0004-0.0087 inch)
End Gap [1]
Production 0.18-0.69 mm (0.0070-0.0271 inch)
Service Limit (max.) 0.18-0.69 mm (0.0070-0.0271 inch)

[1] Measured in Cylinder Bore.