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How to Replace Serpentine Belt Tensioner 05-10 Chrysler 300

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How to Replace Serpentine Belt Tensioner 05-10 Chrysler 300

Created on: 2017-01-18

How to repair, install, fix, change or replace a broken, noisy, squeaky, worn or groaning serpentine belt tensioner on 05, 06, 07, 08, 09, 10 Chrysler 300

  1. step 1 :Removing the Serpentine Belt
    • Familiarize yourself with the serpentine belt with a belt diagram
    • Place the 3/8 drive into the square drive at the bottom of the tensioner
    • Rotate the tensioner clockwise
    • Remove the serpentine belt
  2. step 2 :Removing the Tensioner
    • Remove the 15mm bolts securing the tensioner pulley to the engine
    • Remove the tensioner
  3. step 3 :Installing the Tensioner
    • Insert the tensioner into the engine
    • Tighten the 15mm bolt
    • Torque the bolt to 40 foot-pounds
  4. step 4 :Reinstalling the Serpentine Belt
    • Have the ribs facing the engine, and slide the belt between the tensioner pulley and the engine
    • Flip the belt so the smooth side is touching the tensioner pulley
    • Loop the belt around the crank pulley
    • Bring it around the A/C Compressor
    • Bring it around the power steering pulley
    • Bring it around the idler pulley
    • Bring it around the belt tensioner
    • Pull the tensioner clockwise with the 3/8 inch ratchet
    • Bring it around the alternator
    • Release the tensioner

Tools needed for replacement

  • Ratchets & Related

    Torque Wrench

    3/8 Inch Drive Ratchet

  • Sockets - Metric

    15mm Socket

Installation Video
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Hi, I'm Mike from 1AAuto. We've been selling auto parts for over 30 years! We're dedicated to delivering quality auto parts, expert customer service, and fast and free shipping, all backed by our 100% satisfaction guarantee. So visit us at 1AAuto.com, your trusted source for quality auto parts.

In this video we're going to be working with our 2006 Chrysler 300 3.5 liter V6. We're going to show you how to remove and replace your vehicle's serpentine belt tensioner. If you like this video, please click subscribe. We have a ton more information on this and many other vehicles, and if you need parts for your car, you can follow the link down in the description over to 1AAuto.com.

Here are the items you'll need for this repair: 3/8 Drive Ratchet, 15mm socket, torque wrench

Before removing your serpentine belt, always be sure that you have a belt path diagram. Normally, there's one located on the radiator support, or on the bottom of the hood. However, if yours is missing, you can use a paint marker and simply draw up what you see on the belt path.

We'll start by drawing our pulleys. The first one I see here, is the power steering pulley at the top right. We'll put a P in there. Come across, and we have little one here. This is an idler, so we'll put an I in there. Come down to the bottom left corner, we have a little alternator pulley. Coming back, we have our tensioner, which I like to draw the pivot and a little arm with a little pulley on the end so we know that that's a tensioner. That loops around, and then right between the tensioner and the idler, we have our crank, which we'll draw much bigger, put a C on there. And then right about here, we have our A/C compressor. So now we'll just draw the belt along the outside of the pulleys, comes up, goes under the tensioner, around the crank, under the A/C, and around the power steering. I'm no artist, these are not great drawings by any means, however it follows the right path. I can see all the pulleys and they're marked, so it's all we need to make sure that everything goes back on correctly.

Using a 3/8 drive ratchet, place the square drive into this square 3/8 hole at the bottom of the tensioner, and rotate it clockwise to release the pressure on the serpentine belt. Remove the belt from whatever pulley is easiest to reach. Remove your ratchet, and finish removing the belt from the pulleys. Remove the 15 millimeter bolts securing the tensioner pulley to the engine with a 15 millimeter socket and ratchet. Remove the tensioner from the engine.

Reinstall the tensioner. You'll notice that there's this little stick-out here and a small hole offset from the bolt hole. You'll want to make sure that those line up to keep the tensioner straight while you reinstall your 15 millimeter bolt. Torque the bolt to 40 foot-pounds with a 15 millimeter socket and a torque wrench.

Reinstall your serpentine belt. The best way to reinstall the belt is by flipping it with the ribs facing the engine, and sliding it between the tensioner pulley and the engine. Then flip it over so the smooth side is touching the tensioner pulley. Wrap it back under and over the crank, under the crank and around the A/C compressor. From there, go around the outside of the power steering pump. We'll go over the idler pulley. Ensure that your belt path is correct and that it isn't snagged or hung up anywhere. We'll keep the alternator part in hand, so when we crank our tensioner, we can slide it over the pulley. Double check that your belt path is correct and fully seated. Release the tensioner and remove your ratchet.

Thanks for watching. Visit us at 1AAuto.com for quality auto parts, fast and free shipping, and the best customer service in the industry.

Tools needed for replacement:

    Ratchets & Related

  • Torque Wrench
  • 3/8 Inch Drive Ratchet

  • Sockets - Metric

  • 15mm Socket


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