Piston ring

Item
Measurement
Qualification
Standard or New
Service Limit
Piston ring
Ring-to-groove clearance
Top
0.045−0.070 mm (0.0018−0.0028 in.)
0.13 mm (0.005 in.)
Second
0.030−0.055 mm (0.0012−0.0022 in.)
0.13 mm (0.005 in.)
Ring end gap
Top
0.20−0.35 mm (0.008−0.014 in.)
0.60 mm (0.024 in.)
Second
0.40−0.55 mm (0.016−0.022 in.)
0.70 mm (0.028 in.)
Oil
0.20−0.50 mm (0.008−0.020 in.)
0.80 mm (0.031 in.)