Piston Ring, Engine

Piston Ring End Gap - First Compression Ring 0.20-0.40 mm (0.00787-0.0157 inch)
Piston Ring End Gap - Second Compression Ring 0.36-0.51 mm (0.0142-0.0201 inch)
Piston Ring End Gap - Oil Control Ring 0.250-0.760 mm (0.0098-0.0299 inch)
Piston Ring to Groove Clearance - First Compression Ring 0.043-0.093 mm (0.0017-0.0037 inch)
Piston Ring to Groove Clearance - Second Compression Ring 0.053-0.093 mm (0.0021-0.0037 inch)
Piston Ring to Groove Clearance - Oil Control Ring 0.059-0.215 mm (0.0023-0.0085 inch)