4.7.4 Piston rings
Compression rings seal the piston in the cylinder and prevent gases outflow through the gap between the piston skirt and the cylinder wall. Oil scraper rings remove excess oil from the cylinder walls, preventing it from entering the combustion chamber. The place of installation of the rings and their appearance are shown in Figure 4.27.
A straight or oblique cutout, which is called a lock, is made on the ring. This cutout allows the ring to spring in order to compensate for its expansion when heated, as well as to install the ring into the recess on the piston.
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