Piston Ring, Engine

Piston Compression Ring Gap
Production-Top Groove 0.25-0.40 mm (0.010-0.016 inch)
Production-2nd Groove 0.46-0.66 mm (0.018-0.026 inch) Max.
Service-Top Groove 0.5 mm (0.19 inch) Max.
Service-2nd Groove 0.8 mm (0.31 inch) Max.
Piston Compression Ring Groove Clearance
Production-Top Groove 0.030-0.070 mm (0.012-0.0027 inch)
Production-2nd Groove 0.040-0.080 mm (0.015 - 0.0031 inch)
Service 0.085 mm (0.33 inch) Max.
Piston Oil Ring Gap
Production 0.25-0.76 mm (0.010-0.029 inch)
Service 0.90 mm (0.035 inch) Max.
Piston Oil Ring Groove Clearance
Production 0.046-0.096 mm (0.0018-0.0037 inch)
Service 0.10 mm (0.0039 inch) Max.