This article presents the utilitarian need to determine the free vibrations of marine Diesel engine cylinder liners and the authors’ own studies in this area. Theoretical investigations on free vibrations and experimental ones on forced vibrations have been described. Theoretical studies have been conducted with the application of characteristic dimensionless numbers in the Elektroniks Workbench and Wis Sim digital environment enabling virtual modeling of cylinder liner vibrations and determination of their characteristics: amplitudes, frequencies and accelerations. In the theoretical examination mechanical and electrical system analogues have been applied. A calculation method for the cylinder liner vibration damper, developed as a result of the study, has been discussed. Electrical oscillation damping filter design methods basing on the Bessel, Batterword and Chebyshev polynomials have been used. The course of the experimental examinations has been described and their results have been presented. Validation of the developed method has been executed applying measurement results concerning the parameters of Diesel engine cylinder liner vibration with various elastic elements. The results of the authors’ own, theoretical and experimental, examinations have been confronted with those obtained by other scholars.

In the article the stages of carrying out repairs and renovations of a coal-cutting machine on the construction of a normal type 401 Wb. The types of damage and fractures of the carbide elements de-scribed. Particularly described positions used to repair these defects. It is noticed that the thinnest types of damages of this type of carcass are: wear of the side walls and floor of the wagon through goods such as coal, scrap, ores; wear and failure of brake pads, fatigue cracks in the wagon supporting springs; wear and failure of bumpers; dis-placement of the wheel rim relative to the barefoot..