GMC Workshop Service and Repair Manuals

Piston Ring: Specifications

Piston Rings

Piston Ring End Gap - First Compression Ring - Measured in Cylinder Bore

Production ...............................................................................................................................................................  0.23-0.44 mm (0.009-0.017 inch)
Service .....................................................................................................................................................................  0.23-0.5 mm (0.009-0.0196 inch)

Piston Ring End Gap - Second Compression Ring - Measured inch) Cylinder Bore

Production .................................................................................................................................................................  0.44-0.7 mm (0.017-0.027 inch)
Service .....................................................................................................................................................................  0.44-0.76 mm (0.0173-0.03 inch)

Piston Ring End Gap - Oil Control Ring - Measured inch) Cylinder Bore

Production ...............................................................................................................................................................  0.18-0.75 mm (0.007-0.029 inch)
Service .....................................................................................................................................................................  0.18-0.81 mm (0.007-0.032 inch)

Piston Ring to Groove Clearance - First Compression Ring

Production .....................................................................................................................................................  0.04-0.085 mm (0.00157-0.00335 inch)
Service ...........................................................................................................................................................  0.04-0.085 mm (0.00157-0.00335 inch)

Piston Ring to Groove Clearance - Second Compression Ring

Production .......................................................................................................................................................  0.04-0.078 mm (0.00157-0.0031 inch)
Service .............................................................................................................................................................  0.04-0.078 mm (0.00157-0.0031 inch)

Piston Ring to Groove Clearance - Oil Control Ring

Production ...........................................................................................................................................................  0.012-0.2 mm (0.0005-0.0078 inch)
Service .................................................................................................................................................................  0.012-0.2 mm (0.0005-0.0078 inch)