Piston Ring, Engine

Piston ring side clearance
Groove 1 0.040 - 0.075 mm (0.0016 - 0.0029 in)
Groove 2 0.030 - 0.065 mm (0.0012 - 0.0025 in)
Groove 3 0.020 - 0.055 mm (0.0008 - 0.0022 in)

Piston ring end gap
Groove 1 0.20 - 0.50 mm (0.008 - 0.020 in)
Groove 2 0.20 - 0.55 mm (0.008 - 0.022 in)
Groove 3 0.30 - 0.90 mm (0.012 - 0.035 in)