Too much taper wear is also accompanied by out-of-round (oval) wear, which results when the piston rocks on its wrist pin at top dead center and bottom dead center.

Question

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Taper wear occurs when the cylinder becomes worn in a conical shape due to the piston moving more at the top than at the bottom, leading to uneven wear. This uneven wear can cause the piston to rock on its wrist pin at the top dead center (TDC) and bottom dead center (BDC) positions, contributing to out-of-round or oval wear in the cylinder.

Too Much Taper Wear Is Also Accompanied by Out-Of-Round (Oval)