Piston Ring, Engine

Piston Ring End Gap - First Compression Ring 0.15-0.30 mm (0.006-0.012 in)
Piston Ring End Gap - Second Compression Ring 0.20-0.45 mm (0.008-0.018 in)
Piston Ring End Gap - Oil Control Ring - Rails 0.15-0.51 mm (0.006-0.020 in)
Piston Ring to Groove Clearance - First Compression Ring 0.04-0.08 mm (0.0015-0.0031 in)
Piston Ring to Groove Clearance - Second Compression Ring 0.030-0.070 mm (0.0012-0.0030 in)
Piston Ring to Groove Clearance - Oil Control Ring 0.027-0.176 mm (0.0011-0.0069 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 1.460-1.537 mm (0.0575-0.0605 in)