Checking the Serpentine Belt Pulley

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Learn how to check the serpentine belt pulley with expert tips on cars in this free auto repair video clip.

Part of the Video Series: How to Change a Serpentine Belt
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Video Transcript

In this clip we are going to talk about inspection of the accessory pulleys for pits, play, proper alignment and foreign material. Whenever servicing the vehicle’s accessory drive belt, once the belt is removed you are going to want to check the belt’s mating services or the pulley’s for any kind of problems that they may have. Some of the problems include excessive play in the pulley bearing which will be indicated by the pulley moving not relative to its accessory. We have the mounting bolts loose and as you can see our power steering pump can move freely. What you are going to want to do is apply a small amount of leverage to a relative component. As you can see, the pulley isn’t flopping around relative to the power steering pump. That indicates the condition of the pulley’s shaft and bearings are in good shape. Another thing you are going to want to look for is any kind of pits or damage inside the belt’s mating surface. As you can see, we will rotate it around. You don’t see any huge dings or dents or any kind of cracks on the pulley service inside here. The last thing you are going to want to look for when inspecting your pulleys is for foreign material. It is possible to get rocks, pieces of plastic, impact particles from something you may have hit such as bird feathers, things of that nature stuck inside here. You are going to want to rotate the pulley as I am doing here and inspect the entire surface. If there is something stuck in here like say a small stone, as the engine is running that stone is going to continue to try and impregnate itself into your belt which will cause premature wear and failure. Those are some things to look for anytime you service your drive belts.


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