N'ihi na kpọmkwem okpomọkụ ike nke mmiri bụ nnukwu, okpomọkụ ịrị elu mgbe absorbing okpomọkụ nke cylinder block bụghị ọtụtụ, otú okpomọkụ nke engine site jụrụ mmiri mmiri circuit, ojiji nke mmiri dị ka a okpomọkụ ụgbọelu okpomọkụ conduction, na mgbe ahụ site na nnukwu ebe nke okpomọkụ sink n'ụzọ nke convection okpomọkụ dissipation, iji nọgide na-arụ ọrụ kwesịrị ekwesị okpomọkụ nke dizel generator engine.
Mgbe mmiri okpomọkụ nke mmanụ dizel generator engine dị elu, mmiri mgbapụta mmiri na-agbapụta mmiri ugboro ugboro iji belata okpomọkụ nke engine, (The tank tank na-emi esịnede a oghere ọla kọpa tube. Akwa okpomọkụ mmiri na-abanye n'ime tank mmiri site na ikuku jụrụ na mgbasa na engine cylinder mgbidi) iji chebe engine, ma ọ bụrụ na oyi mmiri okpomọkụ dị oke ala, oge a ga-akwụsị mgbasa mmiri, iji zere okpomọkụ disel dị ala.
Onye na-emepụta mmanụ dizel na-arụ ọrụ dị oke mkpa na ahụ dum generator, ma ọ bụrụ na a na-eji tank mmiri eme ihe n'ụzọ na-ekwesịghị ekwesị, ọ ga-emebi engine diesel na generator, ọ ga-emekwa ka engine mmanụ dizel wepụ n'ọnọdụ dị njọ, ya mere, ndị ọrụ aghaghị ịmụta iji mmanụ dizel generator setịpụrụ tank mmiri.