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How To Replace Serpentine Belt Tensioner 04-08 4.6L V8 Ford F150

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  1. step : Removing the Air Intake (0:38)
    • Loosen the two hose clamps on the air intake hose with a flat blade screwdriver
    • Disconnect the vacuum hose
    • Remove the air intake hose
  2. step : Removing the Serpentine Belt (1:00)
    • Insert the 1/2 inch drive ratchet into the tensioner
    • Turn the tensioner clockwise to loosen the belt
    • Pull the belt off the alternator
    • Release the tensioner
    • Pull the belt off by hand
  3. step : Removing the Tensioner (1:53)
    • Remove the three 10mm bolts from the tensioner
    • Remove the tensioner
  4. step : Installing the New Tensioner (2:32)
    • Insert a bolt into the tensioner
    • Hang the tensioner by its bolt
    • Tighten the three 10mm bolts to the tensioner
    • Tighten the 10mm bolts to 25 foot-pounds of torque
  5. step : Reinstalling the Serpentine Belt (3:07)
    • Familiarize yourself with the route of the serpentine belt
    • Feed the belt between the tensioner and idler pulley
    • Bring it around the A/C Pulley
    • Loop the belt around the crank pulley
    • Bring it around the water pump
    • Bring it around the idler pulley
    • Bring it around the power steering pulley
    • Bring it around the belt tensioner
    • Pull the tensioner clockwise with the 1/2 inch ratchet
    • Pull the belt over the alternator
    • Release the tensioner
  6. step : Reinstalling the Air Intake (5:38)
    • Insert the air intake hose into place
    • Connect the vacuum hose
    • Tighten the two hose clamps with a flat blade screwdriver

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!

In this video, we're going to show you how to replace a serpentine belt tensioner on this 2005 Ford F150 with the 4.6L V8 engine. The items you'll need for this are a new serpentine belt tensioner from 1AAuto.com, a 1/2" ratchet, piece of pipe for some extra leverage, a 10mm socket and ratchet, a torque wrench, and a flat blade screwdriver.

Using your screwdriver, just loosen up the hose clamp here and right here. Then push the tab on this hose and pull it free. Then pull your air intake hose free.

Now, your serpentine belt tensioner is located right down here. Using a 1/2" ratchet or breaker bar you just want to insert it into that square hole on the tensioner. Then, using a piece of pipe for some extra leverage, just pull the tensioner back and it will loosen up the belt. You can lift the belt up and off the alternator. Then just carefully let the ratchet back down and pull it free. Now you can pull your belt up and out.

Reach way down and pull the belt off of the AC compressor pulley first, which is way down to the left as you're looking at the front of the engine. Then, once it's off of that, go down and pull it off of the crank pulley, which is right in the center of the engine.

Now to remove your tensioner, you want to remove these three 10mm bolts. We'll fast-forward as Mike removes those. You can see he decided to use air-powered tools here. You can do that as well. It just speeds up the process. Then your tensioner will pull free. On the bottom is the old serpentine belt tensioner; above it is the new one from 1A Auto. You can see they're identical and they'll fit exactly the same.

We're just going to put our old one back in because it works fine. Just feed your serpentine belt tensioner back down into place with one bolt at the top already in. Then, once you get it lined up, just tighten that bolt in by hand, and then replace the other two bolts and tighten them all up. Then torque each of these to 25 foot-pounds.

Now you want to follow this belt diagram as you're putting the belt back on. You can reference it again throughout the process. Mike's also going to explain the easiest way to put the belt back. First step for putting the belt on is to make a sharp bend in your new belt. You want to feed that between your tensioner pulley and the idler pulley and go down that way. Need to help it along a little bit here. As that loop goes down, reach down, and this is your AC compressor down here. Put the loop down and around your AC compressor. Now, I'm going to take a loop and loop it down. It's going over the tensioner pulley, but I'm going down and around the crank pulley. Then hopefully you can see on the crank pulley, make sure it gets onto the crank pulley. Then a little tight up and around the water pump pulley here. Then there's an idler pulley, and your power steering pump pulley. I'll leave it off of the alternator for right now. Loop it around the power steering pump pulley over here, around this idler pulley.

Take my pipe, pull as far as I can on the tensioner. I should be able to lift the belt up. I'm going to try and take it off of this idler pulley, get it up onto the alternator, pull my tensioner, and then push the belt down. You can see the idler pulley's the last one, so push it right down under. Replace your air intake hose. Reconnect this hose and then tighten up those two hose clamps.

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

  • Torque Wrench
  • 1/2 Inch Ratchet
  • Ratchet
  • A Piece of Pipe (for leverage)

  • Screwdrivers & Related

  • Flat Blade Screwdriver

  • Sockets - Metric

  • 10mm Socket

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02-11 Ford; 03-11 Lincoln; 02-10 Mercury Multifit w/4.6L, 5.4L, 6.8L Serp Belt Tensioner w/Pulley

Ford Lincoln Mercury Serpentine Belt Tensioner DIY Solutions

This part replaces:

  • Dorman 419-011
  • Reference Number 89263
  • Gates 38274
  • OE # 1L2Z6B209AA
  • DIY Solutions BEP00074

Part Details

  • Includes: Pulley
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