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  1. #1

    Default belt squeal on 305 vortec because of alternator pulley?

    OK here is my dilemma every time i buy a new serpentine belt it begins to squeal within a month or so at first i thought it was a bad bearing or pulley so i replaced the idler pulley,alternator,belt tensioner and pulley,water pump,and the ac compressor is also new due to an a/c repair last year the only things not replaced is the power steering and crank shaft pulleys but i know for a fact they are in good shape. so the other day i got to looking and listening to exactly where the sound was coming from turns out it is coming from my alternator pulley it is almost as if the pulley is not wide enough for the belt it rubs the outside edges of the belt and makes a squeal so i filed my belt down to a narrower width and the squealing stopped. is this a problem with aftermarket alternators? Ive been through 3 of them with the same results what can i do to solve this its embarrassing to have a squealing truck.
    by the way its a 96 chevy 4x4 1500 with 305 vortec

  2. #2

  3. #3

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    Trey,
    I am new to this forum.Your truck symptoms are exactly what I am experiencing.
    My question to you, is what method did you use to "file" your belt?
    Also, do you have the Autozone Duralast Gold alternator?

  4. #4
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    It sounds like an alternator that was equipped with the incorrect pulley!! Try changing the alternator with a AC Delco or a different brand.

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  5. #5
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    Quote Originally Posted by Red Z71 Max View Post
    It sounds like an alternator that was equipped with the incorrect pulley!! Try changing the alternator with a AC Delco or a different brand.
    Good idea , had problems with cheap alternators from Auto Zone till AC Delco
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  6. #6

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    I changed my idler pulley,tensioner pulley,fan pulley,alternator & the serpentine belt several times & it stills squeaks..im frustrated already what can it be?it squeaks louder while im accelerating

    - - - Updated - - -

    Oh by the way my truck is a 99 chevy tahoe with vortec

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