Q. What is the use of a belt tensioner?

Answer

Belt tensioners are a part of every engine. A belt tensioner is a miniature component that is a part of your serpentine belt, connected to your car engine. It consists of four essential parts, namely, a base metal, a tension arm, a spring, and a pulley. The belt tensioner has a primary role to play in your engine, by ensuring that the serpentine belt is held tightly enough. If the belt tensioner faulted, then the serpentine belt would not have the necessary tension and become loose. A loose serpentine belt would not fully power the accessories such as the alternator, power steering, air conditioning, etc. Therefore, the belt tensioner ensures that the serpentine belt is seated correctly.