Piston Ring, Engine

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 (0.0012 to 0.0043 inch)
Piston ring end gap
Standard
No. 1 0.30 to 0.40 mm (0.0118 to 0.0157 inch)
No. 2 0.50 to 0.60 mm (0.0197 to 0.0236 inch)
Oil (Side rail) 0.15 to 0.40 mm (0.0059 to 0.0157 inch)
Maximum
No. 1 0.95 mm (0.0374 inch)
No. 2 1.05 mm (0.0413 inch)
Oil (Side rail) 1.00 mm (0.0394 inch)