Piston Ring, Engine

Piston and piston ring
Piston ring groove clearance
No. 1 0.030 to 0.080 mm (0.0012 to 0.0031 inch)
No. 2 0.020 to 0.060 mm (0.0008 to 0.0024 inch)
Piston ring end gap
STD
No. 1 0.300 to 1.100 mm (0.0118 to 0.0433 inch)
No. 2 0.400 to 1.200 mm (0.0157 to 0.0472 inch)
Oil 0.150 to 1.100 mm (0.0059 - 0.0197 inch)
Maximum
No. 1 1.05 mm (0.0413 inch)
No. 2 1.20 mm (0.0472 inch)
Oil 1. 10 mm (0.0433 inch)