Piston Ring, Engine

PISTON RING END GAP
First Compression Ring 0.20-0.35 mm (0.0078-0.0138 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 0.040-0.080 mm (0.0016-0.0031 in)
Second Compression Ring 0.003-0.068 mm (0.0001-0.0027 in)
Oil Control Ring 0.024-0.176 mm (0.0009-0.0069 in)