Piston Ring, Engine

Ring gap measurement:
Top compression ring gap 0.40 to 0.55mm (.015in to.0217 in.)
Second compression ring gap 0.25mm to 0.50mm (.0099 to.0197 in.)
Oil control ring gap 0.20 to 0.40mm (.0079 to.0158 in.)

Piston ring to groove clearance:
Top compression ring gap 0.12 to 0.16 mm (.0048 to.0063 in.)
Second compression ring gap 0.065 to 0.110 mm (.0026 to.0044 in.)
Oil control ring gap 0.03 to 0.07 mm (.0012 to.0028 in.)