Piston Ring, Engine

Piston Ring End Gap - First Compression Ring 0.20 - 0.40 mm (0.008 - 0.016 inch)
Piston Ring End Gap - Second Compression Ring 0.35 - 0.55 mm (0.014 - 0.022 inch)
Piston Ring End Gap - Oil Control Ring - Rails 0.25 - 0.76 mm (0.010 - 0.030 inch)
Piston Ring to Groove Clearance - First Compression Ring 0.04 - 0.08 mm (0.0015 - 0.0031 inch)
Piston Ring to Groove Clearance - Second Compression Ring 0.030 - 0.069 mm (0.0012 - 0.0027 inch)
Piston Ring to Groove Clearance - Oil Control Ring 0.090 - 0.106 mm (0.0035 - 0.0042 inch)
Piston Ring Thickness - First Compression Ring 1.170 - 1.190 mm (0.0461 - 0.0469 inch)
Piston Ring Thickness - Second Compression Ring 1.471 - 1.490 mm (0.0579 - 0.0587 inch)
Piston Ring Thickness - Oil Control Ring - Rail - Maximum 0.43 mm (0.0169 inch)
Piston Ring Thickness - Oil Control Ring - Spacer 1.574 - 1.651 mm (0.0620 - 0.0650 inch)