Bayan an fara injin tuki, yana motsa injin murɗawa don juyawa ta cikin bel mai kusurwa uku, wanda aka canza shi zuwa piston ta hanyar injin crank don yin motsi a cikin silinda. Lokacin da piston ke motsawa daga murfin zuwa shaft, ƙarar silinda yana ƙaruwa, matsin lamba a cikin silinda yana ƙasa da matsin yanayi, kuma iskar waje tana shiga cikin silinda ta hanyar matattarar matattarar ruwa da tsotsa; Bayan isa tsakiyar matacciyar ƙasa, piston yana motsawa daga gefen shaft zuwa gefen murfin, an rufe bawul ɗin tsotsa, ƙaramin silinda yana raguwa a hankali, iska a cikin silinda yana matsawa kuma matsin yana ƙaruwa. Lokacin da matsin lamba ya kai wani ƙima, ana tura bawul ɗin da ke shayewa, kuma iska mai matsawa ta shiga cikin tankin ajiyar iska ta bututun mai. Ta wannan hanyar, kwampreso yana aiki zagaye -zagaye, yana ci gaba da watsa iska mai matsawa zuwa tankin ajiyar iska, kuma a hankali yana ƙara matsin lamba a cikin tankin, Don samun isasshen iska mai buƙata.