Currently, among the ship's power plant (SPP), diesel installation taking pride of place, they are used by approximately 90% of global civil courts-fleet. In the domestic shipbuilding industry more than 95% of vessels under construction are the vessels. Diesel units are equipped with many types of vehicles and fishing vessels of sea and river fleet. The main factors contributing to the widespread use of diesel engines on ships as the main and auxiliary engines are their high efficiency, reliability, service life significantly. As part of Navy ships is a large number of ship internal combustion engines (ICE) various types and grades, which differ both in structure and in performance. GOST 4393-74 * includes common symbols marine, locomotive and stationary diesel engines.
" In the letter grades of diesel engines mean: D-stroke, H – Four-, R – Reverse, C – ship with the reverse clutch, P – with the gear transmission, DD – two-stroke double-acting, K – cross-head, h – supercharged. Figures show, the first facing letters – the number of cylinders in the numerator – the diameter of the cylinder, in the denominator – stroke 2. The number after the shot – the revision number of this type (1, 2, etc.) of the engine. For example, grade diesel 5DKRN5O/110 – 2 means a five-cylinder, two stroke, cross-head, reversible, with the supercharged cylinder diameter 50 cm, 110 cm stroke, the second modification. In addition to signs on state standards, used as factory brand diesel engines. Leading foreign firms producing malooborotnye marine diesel engines are as follows: "Burmeister and Vine" (Denmark), "Sulzer" (Switzerland), MAI (FRG), 'Doxford' (UK), "Stork" (Netherlands), "Getaverken" (Sweden), "Fiat "(Italy)," Pilstik "(France) and their licensees.