Piston Ring, Engine

Piston Rings
Standard end gap
No. 1 ring 0.25 to 0.35 mm (0.0098 to 0.0138 inch)
No. 2 ring 0.35 to 0.50 mm (0.0138 to 0.0197 inch)
Oil ring 0.10 to 0.35 mm (0.0039 to 0.0138 inch)
Maximum end gap
No. 1 ring 0.91 mm (0.0358 inch)
No. 2 ring 1.06 mm (0.0417 inch)
Oil ring 0.82 mm (0.0323 inch)
Standard ring groove clearance
No. 1 ring 0.02 to 0.04 mm (0.0008 to 0.0016 inch)
No. 2 ring 0.01 to 0.03 mm (0.0004 to 0.0012 inch)
No. 3 ring 0.01 to 0.03 mm (0.0004 to 0.0012 inch)