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Discuss Serpentine belt noise in the alt.autos.gm forum at Car Dealer Forums; Vehicle is 1994 Chev silverado 350 5.7l engine w a/c I have recently (2 weeks) ...
  1. #1
    chrisempey@gmail.com
    Guest

    Default Serpentine belt noise

    Vehicle is 1994 Chev silverado 350 5.7l engine w a/c

    I have recently (2 weeks) changed my belt and no noise for those 2
    weeks then squeaking. Changed tensioner still noise.
    Only get the noise when stepping on the gas after tensioner change. Any
    onther suggestions?
    Thanks




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  2. #2
    sdlomi2
    Guest

    Default Re: Serpentine belt noise




    <chrisempey@gmail.com> wrote in message
    news:1156438002.474220.51820@i42g2000cwa.googlegro ups.com...
    > Vehicle is 1994 Chev silverado 350 5.7l engine w a/c
    >
    > I have recently (2 weeks) changed my belt and no noise for those 2
    > weeks then squeaking. Changed tensioner still noise.
    > Only get the noise when stepping on the gas after tensioner change. Any
    > onther suggestions?
    > Thanks
    >

    Seems to be common with GM's around your model years. Several people
    I've talked to have had to quit accelerating so quickly. One thing is for
    sure: you don't want to use an el cheapo brand serp. belt. Get a known good
    quality belt and it sometimes will make it stop the acceleration-squeal. DO
    NOT spray anything on it. Ensure pulley-grooves are clean.
    Ensure idler pulleys(often made of pastic) are not worn excessively;
    they tend to wear the outer edge faster and slower wear as you progress
    toward the inner side(not square-across the surface, but at an incline).
    We've changed several of these, esp. on supercharged Buick Ultra's, to
    both keep the belt from 'riding' off the idler pulley AND to reduce
    accel.-squealing. No adjustments other than replacing tensioner, as you've
    already done. HTH, s



  3. #3
    John Horner
    Guest

    Default Re: Serpentine belt noise

    sdlomi2 wrote:
    > <chrisempey@gmail.com> wrote in message
    > news:1156438002.474220.51820@i42g2000cwa.googlegro ups.com...
    >> Vehicle is 1994 Chev silverado 350 5.7l engine w a/c
    >>
    >> I have recently (2 weeks) changed my belt and no noise for those 2
    >> weeks then squeaking. Changed tensioner still noise.
    >> Only get the noise when stepping on the gas after tensioner change. Any
    >> onther suggestions?
    >> Thanks
    >>



    With the belt off, check for play in everything it drives. Recently I
    saw a Ford truck with a similar problem which turned out to be caused by
    the water pump bearings being shot.

    Also, try the Goodyear Gatorback belt. They run very quietly in my
    experience.

    John

  4. #4
    warrenry
    Guest

    Default Re: Serpentine belt noise


    I've had 2 new belts make noise like bad bearing. The most resent was
    90 Cavalier, making noise so I replace it with a good quality belt and
    had the same noise. Applied a very small amount of silicone sprary and
    the noise went away. As soon as the silicone dissipated the noise came
    back. Anyway, I guess the theory of good quality is not all that true.
    I wonder how many idlers have been replaced because of a bad new belt.

    Warren

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