Piston Ring, Engine

Piston ring
Piston ring groove clearance
No. 1 0.03 to 0.08 mm (0.0012 to 0.0031 inch)
No. 2 0.02 to 0.06 mm (0.0008 to 0.0024 inch)
Oil 0.03 to 0.11 mm (0.0011 to 0.0043 inch)
Specified end gap
No. 1 0.30 to 0.95 mm (0.0118 to 0.0031 inch)
No. 2 0.50 to 1.05 mm (0.0008 to 0.0024 inch)
Oil (side rail) 0.15 to 1.00 mm (0.0012 to 0.0043 inch)