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)
Piston Ring Grove Width - Top 1.23-1.25 mm (0.0484-0.0492 inch)
Piston Ring Grove Width - Second 1.52-1.54 mm (0.0598-0-0606 inch)
Piston Ring Grove Width - Oil Control 2.52-2.54 mm (0.0992-0.1000 inch)