engine
The Italian word for engine is 'motore'. It is used in the same way as in English, referring to a machine that converts energy into mechanical force or motion. For example, a car engine is called 'motore a combustione interna' in Italian.
The engine of my car is noisy.
In this sentence, we are describing the condition of the engine of a car belonging to the speaker. Specifically, it is noisy.
I am studying how the engine works.
Here, the sentence speaks about the speaker studying or learning about the operation of engines or possibly a specific engine.
I replaced the engine of my motorcycle.
This sentence talks about an action the speaker has completed. They replaced the engine of their motorcycle.