Piston Ring, Engine

PISTON RING END GAP
First Compression Ring 0.20-0.35 mm (0.008-0.014 in)
Second Compression Ring 0.35-0.55 mm (0.014-0.022 in)
Oil Control Ring - Rails 0.25-0.75 mm (0.010-0.030 in)

PISTON RING TO GROOVE CLEARANCE
First Compression Ring 0.04-0.08 mm (0.0015-0.0031 in)
Second Compression Ring 0.030-0.069 mm (0.0012-0.0027 in)
Oil Control Ring 0.058-0.207 mm (0.0023-0.0081 in)