The upper and lower pistons are used to repair diesel engines 2D100, 10D100, which are installed on mainline diesel locomotives of the TE10M series. The piston directly perceives the load from gases formed in the cylinder during fuel combustion, and transmits this force through the connecting rod to the crankshaft. In two-stroke engines, especially with straight-through-slot scavenging, creating a hermetic seal for the crankcase is difficult to solve. The design of a pinless piston provides better sealing of the crankcase than a piston with bosses.
