Question about 1990 Ford F150

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Belt slipping I have a 1990 ford f150 The serpentine belt keeps slipping off the top right wheel just enough that it makes a screeching sound ..What I do to correct that t/y

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  • Anonymous Mar 28, 2014

    I just replaced to serpentine belt and want to get rid of the screeching sound. How do I do it?

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If the belt keeps coming off the pulley you have an alignment problem. Check the idler pulley on the truck to see if it is loose or has a worn out bearing. You need to get the pulley that is crooked replaced or shimmed. Did you by chance change the water pump and now have the problem?

Posted on Feb 26, 2009

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I don't know what a "early" sound is, but there are several problems that can cause a screech: the commonest is a slipping power-steering belt combined with a stiffness in the steering rack. The cheapest is probably a stone caught between the brake pads and disc. So first check your tyre pressures, then check your brakes finally, take it to a garage to have the power-steering looked at.

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The loud screeching sound is from the serpentine belt slipping over the pulleys a little. You probably got some radiator coolant on the belt or pulleys when replacing the radiator. When you connect both battery cables the alternator is trying to charge which puts a load or drag on the alternator which causes the belt to slip over the pulley enough to cause the screeching. The only way to correct this is to take the belt back off and wash it with warm soapy water to remove the coolant contamination from the belt. Then scrub the pulleys also as coolant was transferred from one pulley to another by the serpentine belt. Then replace the belt and put a little comet cleanser onto the belt to extract a little more of the contamination from the belt and pulleys before you start it up. And last but not least make sure the belt has the correct tension so as to prevent it from slipping. If you wait to long the belt will always be contaminated and forever screech. Do not buy any belt dressing for the belt. That stuff is junk and makes the rubber in the belt soft and leads to a premature belt failure.

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Find the spring loaded Tensioner pulley and use a wrench on the nut in the center of the pulley to pull the pulley away from the belt. Once you have released enough tension, you can slip the belt off of one of the other pulleys and gently release the Tensioner pulley. slip the belt off the rest of the pulleys and put the new belt in the same way the old one came out, pulling the tensioner pulley out and slipping the belt back under it, before gently releasing. Make a note beforehand of how the belt is installed to be sure you get it back in correctly. The grooves in the belt should go against the grooved pulleys and the flat side of the belt should go against the flat pulleys. This diagram may be helpful.

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Have your serpentine belt checked for normal wear and tear. When the belts get worn out, they can slip on the pulleys designed to move the belt and cause such a screeching sound. It's annoying and embarrassing all at the same time.

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Hello,

Just follow these steps to remove and replace the alternator. You will need this tools, Serpentine belt tool, Battery wrench, Lug wrench, Floor jack, Jack stand, Socket set,

  1. Open the hood, locate the serpentine belt tensioner and move the tensioner off the
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  2. Disconnect the negative battery cable from the battery with the battery wrench.
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  3. Turn the lug nuts on the right-front wheel counterclockwise until they're loose
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  4. Lift the right-front end with the floor jack and support it on a jack stand placed
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  5. Slip the serpentine belt off the alternator pulley by hand. You can access the
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  6. Remove the alternator mounting bolts with your socket set. Lift the alternator out
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  7. Thread the alternator mounting bolt through the new alternator and into the
    alternator bracket by hand. Tighten the bolts with your socket set.
  8. Attach the alternator ground strap with your socket set. Plug the alternator
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  9. Slip the serpentine belt over the new alternator pulley. Reinstall the wheel and
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Hope this helps you.
Take care and good luck

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1 Answer

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Needa serpentine belt routing diagram for a 1990 F150 pickup truck


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Automotive V-Ribbed Belt (Standard)
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Is this engine is your model, I hope help you with this. Good luck.

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