The object of researce is as follows:service life estimation of powerplant mainings as well as determination methods of wear degree of matings of the automobile engine and transmission. The aim of research:is to raise application efficience of transport vehicles on the basis of scientific principles development of powerplant reliability estimation which take into account individual peculiarities and external of the concrete vehicle operation by operating parameters. Methods of recearch: in setting a task aims of research the hypothetical method has been used in analysis of works of previous researchres the historical method has been applied; the axiomatic method, methods of ranking and formalization analitical, probabilistic and statistic methods have been employed for creation of mathematical methods; for correctness confirmation of developed models experiment methods have been used. Equipment: stands of wear velocity of powerplant matings, computing, technique. Theoretical and practical results: Prac tical importance. Basic sceintific tenets, developments and recommendations have been used in: educational process in training mechanical engineers on speciality 7.090215 "Automobiles and automobile facilities", development and improvement of correction methods of standards, planning, control estimation and prediction of indices of service life consumption, maintenance intervals and planning spare parts consumption of the KamAZ automobile engineering as well as automobiles of the ZIL, MAZ and KrAZ family. Importance for the theory. The all-round estimation theory and the prediction theory of the residual service life of powerplants and application increase of transport vehicles by service life correction, oil-change periods and calculation of a number of spare parts have been developed; scientifically grounded developments in the theory of transport vehicle operation which ensure of a substantial applied problem have been obtained. New scientifically grounded theoretical and experimental results which, in tot al, are considerable achievement for the theory development of powerplant reliability of transport vehicles being a components of the transport vehicle operation theory have been obtained as well. Novelty of newly-introducted:for the first time appropriate criteria of service life estimation of powerplants and effect on it external conditions individual peculiarities have been developed; scientific and methodical principles of the prediction theory of the residual powerplant service life of motor transport means, which are based on diagnostic methods of thechnical state estimation of mating and mathematical models of wear taking into account power expenses to transport work execution, individual peculiarities and the technical state of the concrete operated vehicle have been developed; for the first regulaties of residual service life determination, spare part consumption and oil-chang periods in powerplants for concrete conditions of operation depending on transport work volume, motion speed, fuel consumptio n as well as individual peculiarities of the concrete automobile have been defined; the field of statistic and heuristic prediction of the residual service life which takes into account rolling stock age, average annual fuel consumption and standard age of the rolling stock has been substantiated theoretically for the first time; for the first time dependences of mating wear velocity of powerplants which allow effect of factors to be predicted, to carry out choice of rational solutions on operation of transport vehacles and to define effect of external conditions on the residual service life have been determined. Level of introduction: basic scientific tenets, developments and recommendations have been introduced into: educational process in training mechanical engineers on the speciality of "Automobiles and automobile facilities" temporal regulations on diagnosing organization, maintenance repair and supply by spare parts in using means of conveyance in the KamAZ autocenter (temporal regulations about DTORZC H), methods of the recidual service life prediction of powerplants in the control system of automobile maintenance and repair of ATP-11261 in Pavlograd, Dnepropetrovsk region. The field of application: automobile transport.
