Piston Ring, Engine

Piston Ring
Piston Ring-to-Ring Groove Clearance
Top 0.030-0.065 mm (0.0012-0.0025 in)
Second 0.030-0.070 mm (0.0012-0.0027 in)
Oil (rail) 0.07-0.16 mm (0.003-0.006 in)
Maximum
Top, Second 0.15 mm (0.006 in)
Oil 0.20 mm (0.008 in)
End Gap (Measured in Cylinder)
Top 0.15-0.30 mm (0.006-0.011 in)
Second 0.30-0.45 mm (0.012-0.017 inch)
Oil (rail) 0.20-0.70 mm (0.008-0.027 inch)
Maximum 1.0 mm (0.039 inch)