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How to Replace Serpentine Belt Idler Pulley 04-13 Jeep Liberty

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  1. step : Remove the serpentine belt (0:32)
    • Locate your serpentine belt routing diagram
    • Use your 15 mm socket and ratchet to release tension from the serpentine belt tensioner.
    • Remove the serpentine belt.
    • Observe your serpentine belt.
    • Replace your serpentine belt if you find any cracks on the smooth side, or you noticed any snapped cord poking out of the belt, fraying or excessive wear.
  2. step : Remove the serpentine belt tensioner pulley (0:58)
    • Use your 15 mm socket and ratchet to unbolt the serpentine belt tensioner pulley.
    • You may need to employ a breaker bar to get the bolt loose.
    • Remove the old serpentine belt tensioner pulley and set it aside.
  3. step : Install the new serpentine belt tensioner pulley (1:27)
    • Mount your tensioner pulley.
    • Use your 15 mm socket and ratchet to secure the new serpentine belt tensioner pulley from 1A Auto.
  4. step : Install the serpentine belt (1:49)
    • Procure your serpentine belt diagram
    • Start looping the serpentine belt around the pulleys.
    • With your 15 mm socket and ratchet, release the tension from the serpentine belt to loop the serpentine belt over the last pulley.


Brought to you by 1AAuto.com, your source for quality replacement parts and the best service on the Internet. Hi, I'm Don from 1A Auto. I hope this how-to video helps you and the next time you need a part for your vehicle think of 1AAuto.com. Thanks. In this video, we show you how to the replace the belt tensioner pulley on this 2006 Jeep Liberty with the 3.7 liter, V-6 engine.

The only items you'll need for this is a new belt tensioner pulley from 1AAuto.com and 15 mm socket and ratchet. Your belt is located right at the front of the engine and the tensioner is right here. You just want to put a 15 mm socket and ratchet on that tensioner and pull back on it and that will loosen up the slack on the belt and allow you to pull the belt off each of those pulleys. Now you want to remove that 15 mm bolt from the tensioner pulley. Then the pulley pulls right out. On the left is the old tensioner pulley. On the right is the new tensioner pulley from 1A Auto. You can see they're identical and they'll mount exactly the same. Put the pulley back into place and replace that washer and 15 mm bolt.

We'll fast forward as Don tightens that up with the ratchet. Now when you go to put your belt back on you're going to need this belt routing diagram that shows you exactly how the belt should look, you just want to follow this and make sure your belt, once you get it back on all of the pulleys, looks just like this. Just use this as a reference. It's hard to show it but you can see Don's going to feed the belt down into place and put it onto each of those pulleys. Once you have only one pulley left to put the belt onto, get your ratchet and put that 15 mm socket and ratchet on the tensioner, pull it back, put the belt down on the last pulley and then use the tensioner still to make sure that your belt is on each of the pulleys all the way and that there's no chance of them slipping off and that everything is in place. Once you know everything is in place, just carefully remove the socket and ratchet and you're all set.

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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86-09 GM Chrysler Isuzu Jeep Ford Mitsu Multifit Serp Belt Idler Pulley (6 Groove)

Serpentine Belt Idler Pulley DIY Solutions

This part replaces:

  • Dorman 419-603
  • Reference Number 89009
  • DIY Solutions BEP00469
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