Operability and efficiency of automobiles and infrastructure of stationary power and transport significantly depends on technical condition and technical operation of internal combustion engines, mostly which are diesel engines. Expedient operation of diesel engines in processes holding a timely procedure of parameters monitoring of technical condition and identification, during the work. In the article features of diagnosing of the diesel engine with uniformity of loadings distribution between cylinders provided that of ensuring normal operating state of the fuel units and components of the main systems of the diesel are considered. Results of definition of engine power, efficiency of fuel using and observance of the main ecological restrictions depending on uniformity of distribution of loadings between cylinders are presented. Also in article the main methods of diagnosing of the diesel engine in processes of its work under operating conditions are described. Using the methods, which were described, it is allows to provide efficiency of functioning of the diesel engine and to provide parameters monitoring of vehicles technical condition and power stations of transport infrastructure.