FIELD: mechanical engineering. SUBSTANCE: piston engine, for instance, large-capacity diesel engine, has at least one piston arranged in cylinder and provided with pack of several piston rings in contact with cylinder. Each is fitted in its piston groove. At least one-gas-tight piston ring is provided whose ends are fitted one into the other, and at least one standard piston ring with ends arranged with gap in between forming slot in form of drain channel. At least one specially provided drain channel corresponds to each gas-tight piston ring. Drain channels not formed by slot between two ends of piston rings are made for changing their effective section at wear of corresponding piston ring. EFFECT: possibility of adapting draining capacity to requirements of each particular case. 7 cl, 12 dwg
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