Ntugharị ụgbọ ala na-agụnye ngbanwe nke valves, pistons, cylinder liners, ma ọ bụ cylinders, na-egweri osisi, wdg. Dị ka ọkọlọtọ nke ụlọ ahịa 4S n'ozuzu, ha kwesịrị iji 4 na-akwado ngwaọrụ, ya bụ, pistons, piston rings. valvụ, valvụ mmanụ akàrà, valvụ nduzi, crankshaft shingles, njikọ mkpanaka shingles, oge eriri oge, wiil esemokwu.
Ọ bụrụ na yinye bụ oge, ọ dị mkpa ịgbanwe oge yinye, tensioner, na mgbakwunye na machining, cylinder uwe, egweri aro, oyi nrụgide conduit, ma ọ dịkwa mkpa iji dochie overhaul ngwugwu, curved n'ihu mmanụ akara, curved azụ mmanụ akara. , camshaft mmanụ akara, mgbapụta mmanụ, valvụ nyocha ọzọ, wdg, mgbe ụfọdụ ọ dịkwa mkpa iji dochie ngwa mpụga dị ka diski clutch, wdg. Na nkenke, ọ dị mkpa iji dochie akụkụ ndị na-ejighị n'aka ịrụzi engine iji hụ na arụmọrụ nke engine.
