Question about 2003 Ford F150 Regular Cab

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Bad Squeel from timing chain (area) on passenger side in motor

I have a gross squeel noise coming from inside the font end of the Motor.something to do with the chain or sprockets for the overhead cam on the passenger side. nothing when idle or very mild acceleration, but terrible when there's a load on. .. Can I fix this myself and does anyone have a manuel or some procedures for this?('03 5.4litre 4x4 with a/c) Thanks, Dan

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  • danniel433 Jun 03, 2009

    Thank you but yes I actually did and replaced the tensioner pulley. The noise happens even with the belt off. :(

  • yadayada
    yadayada May 11, 2010

    get yourself a used factory manual on ebay, u will need it.

  • Anonymous Mar 13, 2014

    showed no signs of bad battery or alternater



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Check the idler pulley on the serpentine drive belt,it's mounted on the passenger side timing cover close to the cam gear,and could transfer the noise through and make it sound as if it coming from inside,and it's an easy check and requires no dissambley.I've had personal experience with this in my professional trade,I do industrial maintenance and repair and have seen bad bearings transmit noise down the lenght of a solid 8' shaft.Loosen the tension on the belt and check for play in pulley,spin the pulley and see how it feels,should have a smooth feel.Go to and register they have a good online manual for your truck that you can download and print.

Posted on Jun 03, 2009


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