Wear of the piston-cylinder assembly significantly depends on the quality of lubrication, but the direct cause of that wear is the normal force acting between the piston assembly and the cylinder walls. Therefore, engineers make efforts to reduce the effect of the normal force. One of the possible ways is the introduction of deaxiality in the slider-crank mechanism. This can be done in two ways: by offsetting the piston pin in relation to the cylinder axis or by shifting the crankshaft axis in relation to the cylinder axis. In this paper the research was carried out with the aim to determine to what extent the deaxiality affects the magnitude of the normal force. During the research, ADAMS/View software was used to model the axial and deaxial slider-crank mechanism of an engine. The magnitude and direction of deaxiality were varied, in order to determine how these parameters affect the normal force during one engine cycle.