I-Piston ingumnyakazo ophindaphindayo emzimbeni wesilinda wenjini yemoto. Isakhiwo esiyisisekelo se-piston singahlukaniswa sibe phezulu, ikhanda nesiketi. Ingaphezulu le-piston liyingxenye eyinhloko yegumbi elivuthayo, futhi ukuma kwayo kuhlobene nefomu legumbi elikhethiwe elivuthayo. Izinjini zikaphethiloli zisebenzisa kakhulu ipiston eyisicaba, enenzuzo yendawo encane yokumunca ukushisa. I-piston top yenjini kadizili ivamise ukuba nemigodi ehlukahlukene, ukwakheka kwayo okuqondile, indawo kanye nosayizi kufanele kube nokwakheka kwengxube yenjini kadizili kanye nezidingo zomlilo.