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How to Replace Serpentine Belt Tensioner 09-13 Chevy Silverado

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  1. step : Removing the Serpentine Belt (0:31)
    • Attach a 15mm socket and ratchet to the serpentine belt tensioner
    • Turn the tensioner to loosen the belt
    • Pull the belt off the tensioner
  2. step : Removing the Serpentine Belt Tensioner (0:54)
    • Remove the two 15mm bolts from the tensioner
    • Pull the tensioner off and out
  3. step : Installing the Serpentine Belt Tensioner (1:22)
    • Start the two 15mm bolts into the tensioner
    • Use the bolts to line up the tensioner
    • Put the tensioner into place
    • Tighten the two 15mm bolts into the tensioner
  4. step : Installing the Belt (2:01)
    • Familiarize yourself with the belt routing diagram
    • Route the belt, following the diagram, if it came off any other pulleys
    • Loop the belt around the power steering pulley
    • Bring it around the water pump
    • Bring it around the crank pulley
    • Bring it around the alternator
    • Bring the belt over the tensioner
    • Attach a 15mm socket and ratchet to the serpentine belt tensioner
    • Turn the tensioner to loosen the belt
    • Pull the belt onto the idler pulley

Brought to you by 1AAuto.com, your source for quality replacement parts and the best service on the Internet.

Hi, I'm Mike from 1A Auto. I hope this how-to video helps you out, and next time you need parts for your vehicle, think of 1AAuto.com. Thanks.

The first thing that you want to do is take your 15 millimeter socket and ratchet and put it on the tensioner. Then, push down on the ratchet and it will loosen up the belt so you can pull off all the pulleys.

Once the belt is off, you want to remove these two 15 millimeter bolts right here. We'll just fast forward as he does this. Those bolts are removed. You can pull the tensioner off and out.

Take your new tensioner and you want to line these two bolts up with the two holes down here. Just go in to get it lined up. You just want to tighten those bolts up by hand at first just to secure it into place. Then using your socket and ratchet, tighten it up the rest of the way. We'll fast forward as he does this.

You didn't have to take the belt off to do this repair but if your belt did happen to fall off the other pulleys, here's a belt diagram just to help you get it on correctly. We'll show you the whole process after this. It's a little hard to video but we'll do our best. He puts a loop down around the power stirring pulley there and then comes up around the water pump and down around the main crank pulley. All the while, he's kind of holding it at the alternator and then he puts it over on the tensioner. Basically he's got the belt routed 100% except for the middle idler pulley. Now, he kind of pulls it down near the idler pulley and he's going to grab the wrench, put it on the tensioner, push the tensioner down and push the belt underneath the idler pulley there. Just check it and make sure it's on all the pulleys correctly.

We hope this video helps you out. Brought to you by www.1AAuto.com, your source for quality replacement parts and the best service on the Internet. Please feel free to call us toll-free, 888-844-3393. We're the company that's here for you on the Internet and in person.

Tools needed for replacement:

    Ratchets & Related

  • Ratchet

  • Sockets - Metric

  • 15mm Socket

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Serpentine Belt Tensioner

Serpentine Belt Tensioner DIY Solutions

This part replaces:

  • Dorman 419-112
  • OE # 8125801620
  • DIY Solutions BEP00024

Part Details

  • Includes: Pulley
  • Also Used For: LS Swap
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