Buick Workshop Service and Repair Manuals

Piston Ring: Specifications

Piston Ring

End Gap First Compression Ring ..............................................................................................................................  0.15 - 0.36 mm (0.006 - 0.014 inch)
Second Compression Ring ......................................................................................................................................  0.5 - 0.71 mm (0.0197 - 0.0280 inch)
Oil Control Ring ........................................................................................................................................................  0.25 - 1.02 mm (0.009 - 0.040 inch)

Piston Ring to Groove Clearance 

First Compression Ring ........................................................................................................................................  0.04 - 0.086 mm (0.002 - 0.0033 inch) 
Second Compression Ring ......................................................................................................................................  0.04 - 0.08 mm (0.002 - 0.0035 inch)
Oil Control Ring ..................................................................................................................................................  0.07 - 0.095 mm (0.0028 - 0.0037 inch)

Piston Ring Thickness 

First Compression Ring .........................................................................................................................................  1.164 - 1.190 mm (0.046 - 0.047 inch)
Second Compression Ring ...................................................................................................................................  1.470 - 1.490 mm (0.057 - 0.058 inch) 
Oil Control Ring - Maximum .........................................................................................................................................................  2.960 mm (0.116 inch)

Piston

Piston Ring Groove Width - Top .............................................................................................................................  1.23 - 1.25 mm (0.048 - 0.049 inch) 
Piston Ring Groove Width - Second ........................................................................................................................  1.53 - 1.55 mm (0.060 - 0.061 inch) 
Piston Ring Groove Width - Third ............................................................................................................................  3.03 - 3.05 mm (0.119 - 0.120 inch)