Piston Ring, Engine

Piston Ring Gap And Groove Clearance

Ring Gap
Top Compression Ring 0.40 - 0.55 mm (0.015 - 0.021 in.)
Second Compression Ring 0.24 - 0.51 mm (0.009 - 0.020 in.)
Oil Control Rails 0.15 - 0.66 mm (0.0059 - 0.0259 in.)

Side Clearance
Top Compression Ring 0.04 - 0.09 mm (0.001 - 0.0035 in.)
Second Compression Ring 0.04 - 0.08 mm (0.001 - 0.0031 in.)
Oil Controls Rails 0.06 - 0.21 mm (0.002 - 0.008 in.)