The tensioner with lock nut is an important part of the timing mechanism, which is often used in motorized engines. This component consists of a plurality of parts which are connected to each other by a threaded part. The threaded part of the tensioner serves to precisely adjust the position of its front part against the timing chain. This setting ensures the correct position of the guide part and thus the running of the motorcycle engine. For proper working of the tensioner it is necessary that the threaded part fulfill its purpose. It is necessary to prevent its degradation or excessive wear. Scaning electron microscopy and energy dispersive spectroscopy methods were used to determine the wear of the threaded part of the tensioner. The evaluation focused on surface changes in the threaded part and the possible occurrence of foreign particles on the surface with respect to their material contrast and chemical composition.

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