Ọrụ nke obere ihe nchebe nke dị n'ihu mmanya nke ụgbọ ala: 1, iji gbochie obere ihe ịkwasa n'ime ụlọ engine mgbe ị na-anya ụgbọ ala, na-emebi engine ahụ, ma ọ bụ imetụ mmanụ mmanụ aka mgbe ị na-adọta ala, na-emetụta ya. arụ ọrụ nkịtị nke injin ahụ, mgbe ị na-edebe ụlọ engine dị ọcha; 2, mgbe ị na-agbagharị, ọ nwere ike igbochi mmiri ịgbasa n'ime ụlọ engine, ma gbochie akụkụ eletriki mmiri mmiri na-ebute nsogbu.