EnginePower: How To Change Out A Serpentine Belt And Idle Pulley

Replacing an old serpentine belt (fan belt) isn’t as hard as you think. We will demonstrate the proper procedure for replacing and installing a new serpentine belt. We will also show signs of wear or failure on a serpentine belt. In addition, we will show you how to replace your tensioner and idler pulley while you replace your serpentine belt.

Proper belt tension is critical for the correct operation of all your accessories, and it’s the belt’s wedging force under tension that creates friction and transfers torque from the crank to your accessories. If the tensioner isn’t supplying enough tension, or if the belt is worn down, the belt may slip and create excessive heat or belt noise.

The How To