Ho latela litlhoko tsa tlhahiso, tlhokomelo le polokeho, k'hamphani ea rona e na le lisebelisoa tse latelang:
① masoba a lekanyang oli (hape e le masoba a sampole); ② litanka tse bolokang peterole, parafine, oli ea diesel e bobebe, oli e tala le litlolo tse nkhang hamonate, joalo-joalo, li hloka ho theha li-valve tsa phefumoloho;