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, ọ dị mkpa ka a dochie ha na ngwaọrụ 4 na-akwado ya, ya bụ, pistons, piston ring, valves, valve mmanụ akàrà, valve nduzi, crankshaft shingles, njikọ mgbanaka eriri igwe.
Ọ bụrụ na yinye a na-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, mmanụ mgbapụta, ọzọ valvụ nyocha, wdg, mgbe ụfọdụ ọ dịkwa mkpa iji dochie mpụga ngwa dị ka intch, diski, wdg bụ mkpa dochie mpụga ngwa ndị dị otú ahụ dị ka mpikota onu, diski, wdg. engine iji hụ na arụmọrụ nke engine.
