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How to Replace Idler Pulleys 04-08 Dodge Ram

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  1. step : Releasing the Serpentine Belt (0:36)
    • Familiarize yourself with the route of the serpentine belt under the hood or on the radiator support
    • Insert the 3/8 inch drive ratchet into the tensioner
    • Turn the tensioner clockwise to loosen the belt
    • Pull the belt off the pulley
    • Release the tensioner
  2. step : Removing the Idler Pulley (1:06)
    • Remove the 13mm bolt from the pulley
    • Remove the pulley
  3. step : Installing the New Idler Pulley (1:25)
    • Insert the idler pulley into place
    • Tighten the 13mm bolts to the idler pulley
  4. step : Installing the Tensioner (2:05)
    • Insert the 3/8 inch drive ratchet into the tensioner
    • Turn the tensioner clockwise to loosen the belt
    • Pull the belt over the alternator
    • Release the tensioner
  5. step : Reinstalling the Serpentine Belt (2:11)
    • Follow this step if your serpentine belt came loose
    • Loop the belt around the crank shaft pulley
    • Bring it around the water pump
    • Bring it under the power steering pulley
    • Bring it over the A/C Pulley
    • Bring it under the upper idler pulley
    • Bring it over the lower idler pulley
    • Bring it around the belt tensioner
    • Pull the tensioner clockwise with the 3/8 inch ratchet
    • Pull the belt over the alternator
    • Release the tensioner

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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.

In this video, we're going to show you how to replace the idler pulleys on this 2008 Dodge Ram. You'll need a new pulley or pulleys from 1AAuto.com, a 3/8" drive ratchet, and a 13mm socket, and this pulley fits a multitude of vehicles. This video will help you through a multitude of Dodge and Chrysler vehicles.

Here's your serpentine belt. Before removing, you'll want to make sure you have the diagram for it, usually located under the hood or on the radiator support of your vehicle. Using the drive from a 3/8" ratchet, you'll insert it into the slot on the tensioner. Remove the tension from the belt, take it off a pulley.

Your smooth idler pulley is located directly below your alternator. There's a second smooth idler pulley located below the belt tensioner. Installation and removal is the same as the one above. Remove the 13mm bolt in the center of the pulley. The pulley will come right out with it.

Reinstall your idler pulley. These are available from 1AAuto.com, but this pulley seems okay. We're not going to waste a good part changing it. Refer to your diagram or drawing to ensure that your serpentine belt is routed properly.

Install your 3/8" ratchet into your tensioner, release the belt tension, and install the remainder of your belt over your alternator pulley. If your serpentine belt fell off during the repair, or if you decide to replace your serpentine belt at the same time, here's a quick run-through of how to route the belt onto the pulleys properly.

Thanks for tuning in. We hope this video helped you out. Next time you need parts for your car, please visit 1AAuto.com. Also check out our other helpful how-to and diagnosis videos.

Tools needed for replacement:

    Ratchets & Related

  • 3/8 Inch Drive Ratchet

  • Sockets - Metric

  • 13mm Socket

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Serpentine Belt Idler Pulley (Smooth)

Pulley DIY Solutions BEP00467

This part replaces:

  • Dorman 419-610

Part Details

  • Also Used For: LS Swap
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