Piston ring

Item
Measurement
Qualification
Standard or New
Service Limit
Piston ring
Ring-to-groove clearance
Top
0.060−0.085 mm (0.0024−0.0033 in.)
0.13 mm (0.005 in.)
Second
0.040−0.065 mm (0.0016−0.0026 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
0.50−0.65 mm (0.020−0.026 in.)
0.75 mm (0.030 in.)
Oil
RIKEN:
0.20−0.50 mm (0.008−0.020 in.)
0.55 mm (0.022 in.)
NIPPON PISTON RING:
0.20−0.70 mm (0.008−0.028 in.)
0.75 mm (0.030 in.)