Piston Ring, Engine

Piston Ring End Gap - First Compression Ring 0.20-0.35 mm (0.0078-0.0138 in)
Piston Ring End Gap - Second Compression Ring 0.35-0.55 mm (0.014-0.022 in)
Piston Ring End Gap - Oil Control Ring - Rails 0.25-0.75 mm (0.010-0.030 in)
Piston Ring to Groove Clearance - First Compression Ring 0.040-0.080 mm (0.0016-0.0031 in)
Piston Ring to Groove Clearance - Second Compression Ring 0.003-0.068 mm (0.0001-0.0027 in)
Piston Ring to Groove Clearance - Oil Control Ring 0.024-0.176 mm (0.0009-0.0069 in)
Piston Ring Thickness - First Compression Ring 1.170-1.190 mm (0.0461-0.0469 in)
Piston Ring Thickness - Second Compression Ring 1.471-1.490 mm (0.0579-0.0587 in)
Piston Ring Thickness - Oil Control Ring - Rail - Maximum 0.473 mm (0.0186 in)
Piston Ring Thickness - Oil Control Ring - Spacer 0.96-1.04 mm (0.0378-0.0409 in)