The theme chosen for promotion work, namely, “Researches on machining of diesel engine crankshaft journals surfaces” is closely related with one of Latvia’s significant manufacturing industry branch – ship building and ship repair. When the ship’s diesel engine repairs are carried out crankshaft journal (bearing) surfaces must be renewed according very precise geometrical and surface roughness requirements. Currently technologies available for ship repair enterprises are sufficient to ensure these requirements, however, they are very time consuming and consequently expensive. Therefore it is necessary to undertake comprehensive research of the shipboard diesel engines crankshaft journals surfaces machining. This will allow to improve technological processes and to identify respective surface roughness parameters as well as to give adequate technological recommendations. It is important to note that crankshaft bearing surfaces must be seen as three-dimensional object with definition of microtopographical surface roughness parameters which reflect to real surface. To summarise all available scientific researches in this field it is stated that there are no analysis given regarding impact of technological regimes to the shipboard engines crankshaft journals surface microtopography. Taking into consideration the above mention arguments in the promotion work new technological approach has been used, which significantly simplifies technological work and allows crankshaft journal grinding performing inside the housing without removing it from engine. This technology saves significant financial resources as well as time of engine repair itself. Promotion work contains actual production assignment with practical implication. Solving problems related with surface accuracy it is possible to considerably improve the crankshaft machining process as well as performance of maintenance operations and consequently overall quality of repair works.