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 t0 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)