Piston Ring, Engine

Piston Rings (End Gap Measured in Cylinder Bore)
Piston Compression Ring Gap (Production-Top Groove) 0.25 - 0.40 mm (0.010 - 0.016 inch)
Piston Compression Ring Gap (Production-2nd Groove) 0.46 - 0.66 mm (Maximum) (0.018 - 0.026 inch (Maximum))
Piston Compression Ring Gap (Service-Top Groove) 0.5 mm (Maximum) (0.19 inch (Maximum))
Piston Compression Ring Gap (Service-2nd Groove) 0.8 mm (Maximum) (0.31 inch (Maximum))
Piston Compression Ring Groove Clearance (Production-Top Groove) 0.030 - 0.070 mm (0.0012 - 0.0027 inch)
Piston Compression Ring Groove Clearance (Production-2nd Groove) 0.040 - 0.080 mm (0.0015 - 0.0031 inch)
Piston Compression Ring Groove Clearance (Service) 0.085 mm (Maximum) (0.0033 inch (Maximum))
Piston Oil Ring Gap (Production) 0.25 - 0.76 mm (0.010 - 0.029 inch)
Piston Oil Ring Gap (Service) 0.90 mm (Maximum) (0.035 inch (Maximum))
Piston Oil Ring Groove Clearance (Production) 0.046 - 0.096 mm (0.0018 - 0.0037 inch)
Piston Oil Ring Groove Clearance (Service) 0.10 mm (Maximum) (0.0039 inch (Maximum))