Comprehensive study how to improve the renovation of the shipboard diesel engines crankshaft bearings has been done. This particular paper covers calculations of the applied 3D surface roughness parameters as well as description of the novel grinding equipment for the crankshafts bearing surfaces machining. This technology is suitable to the medium size shipboard diesel engines with crankshaft bearing diameter from 100 up to 350 mm. Its advantage is that it permits to do the surface renovation directly in the engine housing, without removing the crankshaft from the engine. It has been determined, that the optimal microtopographical model of the particular surface is composed by the following parameters: roughness height parameter RaT and two spacing parameters Sm1 and Sm2. Calculations for statistical surface roughness parameters are covered as well. Furthermore calculations of the chosen 3D surface roughness parameters in discrete measurements and chosen parameters equations applicable to elaborated grinding equipment are covered, too.