Pontiac Workshop Service and Repair Manuals

Piston Ring: Specifications

Piston Diameter @ 14.5 mm up ..........................................................................................................................  85.967-85.982 mm (13.3845-3.3851 inch)
Piston to Bore Clearance ...........................................................................................................................................  0.010-0.041 mm (0.0004-0.0016 inch)
Piston Weight .........................................................................................................................................................................................................................  
Piston Height .................................................................................................................................................................................  Max. 0.9 mm-below deck
Piston Pin Bore I.D. ..............................................................................................................................................  20.002-20.007 mm (0.7875-0.7877 inch)
Ring Groove Width, Top ..............................................................................................................................................  1.23-1.25 mm (0.0484-0.0492 inch)
Ring Groove Width, Second .........................................................................................................................................  1.52-1.54 mm (0.0598-0.0606 inch)
Ring Groove Width, Oil Control ...................................................................................................................................  2.52-2.54 mm (0.0992-0.1000 inch)
Piston Ring Thickness, Top ...................................................................................................................................  1.170-1.190 mm    (0.0461-0.0469 inch)
Piston Ring Thickness, Second .................................................................................................................................  1.471-1.490 mm (0.0579-0.0587 inch)
Piston Ring Thickness, Oil Control Rail ...........................................................................................................................  0.43 mm max.    (0.0169 in max.)
Piston Ring Thickness, Oil Control Spacer ...............................................................................................................  1.574-1.651 mm (0.0620-0.0650 inch)
Ring to Groove Clearance, Top ....................................................................................................................................  0.04-0.08 mm (0.0015-0.0031 inch)
Ring to Groove Clearance, Second ...........................................................................................................................  0.030-0.069 mm (0.0012-0.0027 inch)
Ring to Groove Clearance, Oil Control .....................................................................................................................  0.090-0.106 mm (0.0035-0.0042 inch)
Ring Gap, Top ...................................................................................................................................................................  0.20-0.40 mm (0.008-0.016 inch)
Ring Gap, Second .............................................................................................................................................................  0.35-0 55 mm (0.014-0.022 inch)
Ring Gap, Oil Rails ...........................................................................................................................................................  0.25-0.76 mm (0.010-0.030 inch)