Alternator belt squealing 1970 Camaro

Discussion in 'Engine Topic' started by boltupal, Sep 9, 2021.

  1. boltupal

    boltupal Veteran Member

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    After changing my 70 from a TH350 to a 5 speed Tremec the alt. belt squeals. Ive checked and or replaced everything. The only way to stop it is removing the stock fan . Ive even tried different fan clutches. thumbnail_ATT00001 - 2021-09-09T145437.078.jpg thumbnail_ATT00001 - 2021-09-09T145500.096.jpg
     
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  2. Zspoiler

    Zspoiler Veteran Member

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    What belts are you using I have a 377 inch small chevy with either a stock pulley set up or a March set up .I used a set Goodyear "cogged" belts up to 6500 rpm with no squealing,
     
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  3. xten

    xten Veteran Member

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    You didn't happen to paint in the groove of any of the pulleys, did you? I did and ruined brand new belts. Squealed like crazy.
     
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  4. MChamp

    MChamp Veteran Member

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    you could try belt dressing, but I'd scuff the pulleys with scotcbrite. looks like your running an old pump pulley and a new alt. pulley. dunno if that would make a difference.
     
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  5. Twisted_Metal

    Twisted_Metal Administrator Staff Member Lifetime Gold Member

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    That belt looks to be riding a bit deep in the alternator pulley.
    The tension comes from the sides of the belt.
    If the "V" bottoms out, it will be noisy.
    It could be a belt that's out of tolerance for width.
    (I bought a new belt once that did that and had to replace it.)

    Belt dressing will tell you which one is squealing but it's no cure.
    Spray a little on the suspect belt... if it stops squeaking when it's sprayed, you found the culprit.

    I've also used a bar of soap on the belt (while it's running) to find the squealer.
     
  6. tom3

    tom3 Veteran Member

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    Sometimes you can scuff up the belt a bit and help this a lot. Idling just hold a wire brush against the belt sides, light pressure. And don't use a belt with a fabric type covering on the sides, those are for something that has to slip to start the driven pulley.
     
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  7. boltupal

    boltupal Veteran Member

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    Thanks guys. While changing to a Dayco top cog belt I noticed the WP pulley has little wobble in it. Hopefully thats the culprit.
     
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  8. KingofThings

    KingofThings Veteran Member

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    Let us know as that's what I was going to ask.
     
  9. manicmechanic

    manicmechanic Veteran Member Lifetime Gold Member

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    Looking at the first picture. It looks like there is a slight alignment issue as the alt appears to be farther forward than the WP pulley.
     
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  10. KingofThings

    KingofThings Veteran Member

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    I was expecting that this was camera angle distortion as it didn't seem to be in the other photo. Phone cameras are great though they can distort things.
     

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