Piston Ring, Engine

Piston ring
No. 1 Ring groove clearance 0.030 to 0.080 mm (0.0012 to 0.0031 in.)
No. 2 Ring groove clearance 0.020 to 0.060 mm (0.0008 to 0.0024 in.)
No. 1 Standard end gap 0.300 to 0.500 mm (0.0118 to 0.0197 in.)
No. 2 Standard end gap 0.400 to 0.600 mm (0.0157 to 0.0236 in.)
Oil (side rail) Standard end gap 0.150 to 0.500 mm (0.0059 to 0.0197 in.)
No. 1 Maximum end gap 1.10 mm (0.0433 in.)
No. 2 Maximum end gap 1.20 mm (0.0472 in.)
Oil (side rail) Maximum end gap 1.10 mm (0.0433 in.)