Найдите в тексте 5 грамматических ошибок.The term internal combustion piston engine

Найдите в тексте 5 грамматических ошибок.
The term internal combustion piston engine refer to engines in which air and gasoline are bum inside the metal cylinders and which drive rotating crankshaft by means of piston and connecting rods. Since a great deal of heat produced when the gasoline mixture burns or explodes, some means must be provided to carrying away the excessive heat. According to the cooling system employed the piston engines may class as air-cooled engines and liquid-cooled ones.
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