FIELD: mechanical engineering; internal combustion engines. SUBSTANCE: cooling system has water pump installed on cylinder block 2 and consisting of housing 1, pump shaft 3 with fitted-on impeller 6 provided with pressure relief channels 9, toothed pulley, bearing unit 4 and sealing unit 5. Outlet holes of pressure relief channels 9 at side of blades 7 of impeller 6 are brought to leading edges of blades 7, and their number corresponds to number of blades 7. Rear side of impeller 6 has additional blades 8. EFFECT: increased service life of water pump, prevention of engine overheating. 2 dwg
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