Piston Ring, Engine

Piston ring end gap
Compression (top) 0.150 - 0.300 mm (0.006 - 0.0118 in.)
Compression (bottom) 0.300 - 0.550 mm (0.0118 - 0.0022 in.)
Oil ring 0.15 - 0.66 mm (0.00591 - 0.02598 in.)
Piston ring width
Compression (top and bottom)
Oil ring 1.15 mm (0.04528 in.) max.
Piston ring-to-groove clearance
Compression (top) 0.0090 - 0.0235 mm (0.000354 - 0.000925 in.)
Compression (bottom) 0.030 - 0.080 mm (0.00118 - 0.00315 in.)
Oil ring snug fit
Piston ring groove width
Compression (top) 1.230 - 1.250 mm (0.484 - 0.0492 in.)
Compression (bottom) 1.520 - 1.540 mm (0.05984 - 0.06062 in.)
Oil ring 3.030 - 3.055 mm (0.1193 - 0.1203 in.)