Injin fitar da hayaki shine inji mai saurin fitar da ƙanshi, zafin jiki, gas mai hayaki da aka samar a lokacin sarrafa abinci a cikin kicin. Ana zaɓar babban sigogin sarrafawa na hayaki na hayaki shine aikin zafin jiki, iska, cikakken matsin lamba, inganci, amo, ikon injin, gudun juyawa da ikon shaft. Ya kamata hayaki mai fitar da taba ya yi aiki daidai na dogon lokaci a yanayin matsakaicin zafin jiki ba sama da 85 ° C ba. Ya kamata a tabbatar da cewa hayaki mai fitar da taba zai iya ci gaba da aiki na 30min a lokacin da zafin jiki na kafofin watsa labarai ke 280 ℃, kuma har yanzu zai iya ci gaba da aiki daidai lokacin da zafin jiki na kafofin watsa labarai ke sanyaya zuwa zafin jiki na muhalli.