Tacewar iska ita ce ƙofar silinda don shakar da iska mai daɗi.Ayyukansa shine cire ƙura da sauran datti daga iskar da ke shiga cikin silinda don rage lalacewa na sassa daban-daban a cikin silinda.Wannan yakamata ya tada hankalin ma'aikatan jirgin.

Saboda yawan ƙura yana kunshe da ƙwayoyin ma'adini tare da tauri mai girma, idan sun shiga cikin silinda, zai haifar da lalacewa mai tsanani na sassan kamar yadda ake ƙara abrasives zuwa kowane wuri na silinda.Gwaje-gwaje sun nuna cewa idan na'urar janareta na diesel ba a sanye take da na'urar tace iska ba, illar da ke tattare da ita sun hada da: lalacewa na silinda ya karu da sau 8, sawar fistan ya karu da sau 3, sanye da zoben piston. yana ƙaruwa sau 9.

Ana iya ganin cewa matatar iska tana da tasiri mai mahimmanci ga rayuwar sabis na saitin janareta na diesel, kuma ba a yarda a cire matatar iska ta yadda ake so yayin amfani.A lokaci guda kuma, yakamata a tsabtace matatar iska kuma a kiyaye su cikin lokaci gwargwadon adadin ƙurar da ke cikin iska a cikin yankin da ake amfani da shi don tabbatar da kwararar ƙofar, cika buƙatun injin janareta na diesel da aka saita don shan iska, da kuma hana yawancin gazawar da ke haifar da shi (Kamar rauni mai rauni, rashin isasshen ƙarfi, baƙar hayaki daga shaye-shaye, da sauransu).