How belt tensioners work

The drive belt tensioner in your vehicle is a small component that works in conjunction with the V-ribbed belt to ensure that everything in your engine is working properly. The tensioner should be checked from time to time to...

The drive belt tensioner in your vehicle is a small component that works in conjunction with the V-ribbed belt to ensure that everything in your engine is working properly. The tensioner should be checked from time to time to make sure it is installed correctly. Your mechanic can do this for you as part of a scheduled maintenance. Sometimes it may need to be replaced.

What does a belt tensioner do?

In the engine compartment, the V-ribbed belt wraps around various components including the alternator, power steering pump, water pump, A/C compressor and more. The tensioner provides enough tension to the belt while driving to allow the belt to move the various pulleys that drive the engine components.

Parts

The drive belt tension consists of four main parts - the base, the tensioner arm, the spring and the pulley. The base holds the other parts, and the spring keeps the belt taut. The pulley is what facilitates the movement of the belt. The tensioner lever is at the bottom of the tensioner, and if you push it in, it will work against the spring, providing enough slack for you to adjust or remove the belt.

Belt tensioner adjustment

Adjusting the drive belt tensioner is not something you should do yourself - leave this job to a professional. A serpentine belt is absolutely essential to the operation of your vehicle, and if you have belt problems due to an incorrectly adjusted tensioner, the damage can be catastrophic.