Piston Ring, Engine

Piston ring groove clearance
No. 1 0.030 - 0.080 mm (0.0012 - 0.0032 inch)
No. 2 0.030 - 0.070 mm (0.0012 - 0.0028 inch)
Piston ring
end gap
No. 1 0.300 - 0.400 mm (0.0118 - 0.0158 inch)
No. 2 0.400 - 0.550 mm (0.0158 - 0.0217 inch)
Oil 0.130 - 0.380 mm (0.0051 - 0.0150 inch)
Maximum
No. 1 1. 10 mm (0.0433 inch)
No. 2 1.20 mm (0.0472 inch)
Oil 1.15 mm (0.0453 inch)