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Spare parts and components to the plunger
Piston group consists of a piston with piston rings, liners and piston pin. Sensing piston force of the expanding gases through the connecting rod gives them their crankshaft. Pistons are cast of aluminum alloys. The piston head has a bottom. At the head itself has a compression groove and maslosomnogo rings. From groove oil control ring into the inner cavity are two slots on the cat-th excess oil withdrawn by the scraping ring with the cylinder are sent to the engine crankcase.
Depending on the outer diameter of the pistons are divided into 5 classes (difference of 0 , 01 mm), and depending on the diameter. piston pin holes -. 3-4 categories (a difference of 0.004 mm)
are needed to create a seal between the cylinder walls and the moving piston. Compression is produced from iron special composition. The upper cover layer of chromium, a lower layer of tin. For a more snug fit rings made some facet or groove on the outside. or ext. . Surfaces
STEM produce sets of steel or cast iron - with slits for oil withdrawn from the cylinder walls. The fingers in turn, are made of steel. Structurally they are hollow. Outside their temper. Fixed by means of retaining rings. The working surface of the fingers carefully sanded and polished.