Approaches to the evaluation of tribological contact status settings marked surfaces in up "piston ring-cylinder liner", "piston-cylinder liner" the starting point of the movement and small movements using operational full-scale structural elements on the hardware of the machine SMC-2. In this micro-processes that occur at the boundary surface layers of tribological systems, materials, considered as a phenomenon. Presented developed advanced software for modeling of thermal and mechanical loading contact "cylinder liner - piston ring" that enable you to estimate the diametrical wear of the cylinder liner to the target operating time of the internal combustion engine.