Umsebenzi wophawu lwamafutha ngokuvamile uwukuhlukanisa izingxenye ezidinga ukugcotshwa ezingxenyeni zokudlulisela endaweni yangaphandle, ukuze ungavumeli ukuvuza kwamafutha okugcoba.Uhlaka lwamathambo lufana nezinsimbi zensimbi elungwini likakhonkolo, olusebenza njengesiqiniseko futhi lwenza uphawu lukawoyela lukwazi ukugcina ukuma nokushuba kwalo.Ngokwesakhiwo, ingahlukaniswa ibe yi-single skeleton oil seal kanye ne-double skeleton oil seal.Udebe olusizayo lwe-double-lip skeleton oil seal ludlala indima yokuvikela uthuli ukuvimbela uthuli lwangaphandle nokungcola ukuthi kungangeni emshinini.Ngokohlobo lwamathambo, ingahlukaniswa ibe ingaphakathi le-skeleton oil seal, i-skeleton oil seal eveziwe kanye nesigxivizo sikawoyela esihlanganisiwe.Ngokwezimo zokusebenza, ingahlukaniswa ibe i-rotary skeleton oil seal kanye ne-reciprocating skeleton oil seal.Okwama-crankshaft enjini kaphethiloli, ama-crankshaft enjini kadizili, ama-gearbox, ama-different, ama-shock absorbers, izinjini, ama-ekseli nezinye izingxenye.