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Old 07-17-2012, 04:53 PM
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Belt squeals

My belt squeals when I first start up after the car sits for a few weeks or so. Not sure if its the alternator or ac belt. Should I just replace all the belts on my 350 sbc, I've tried tighting them. I also added a chrome pulley on the alternator some time ago, not sure if that could be causing it. Oh the crazy thing is that it stops squealing after i let it warm up for a while and drive it. Any suggestions would be greatly appreciated.

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Old 07-17-2012, 05:28 PM
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The alternator belt on my '75 350 sometimes squeals on startup because the battery is rundown a little and the alternator kicks in very quickly to bring it up to full charge. Its annoying, but does not hurt anything. As soon as the alternator goes to a normal charge rate and the belt warms up a little, I never have a problem with the belt slipping

It will help to change the belt, but probably not cure the problem if you have a chrome pulley. They are a little too slippery sometimes as the alternator kicks in.

Bruce
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Old 07-17-2012, 06:50 PM
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If you can live with it, then maybe that is what you may want to do.

One way to determine which belt is squeaking is to spray a little water on each pulley where the belt contacts while the engine is running (BE CAREFUL AND STAY AWAY FROM THE FAN--see my other post on changing the fan belt with the engine running ).

When the squealing stops you've determined which pulley/and or belt it is. You could try changing belts---i think gates is really good quality. Or try running some steel wool along the grove of the pulley to roughen it up a bit---but don't get too carried away.
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Old 07-17-2012, 07:03 PM
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Thanks for the replies, it is annoying so I can't live with it. Even though I don't drive it much, but when I do I don't like for the squealing to stop before I drive. I will try what y'all suggested before I go in and just change all of them
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Old 07-17-2012, 09:06 PM
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Try using some belt dressing and conditioner, Permatex is one brand, there are many available at any auto parts house. Permatex 80073 - Belt Dressing & Conditioner | O'Reilly Auto Parts
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Old 07-18-2012, 07:27 AM
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I have tried the belt dressing before but never helped. Im thinking its of my alternator current is drained when I first start it up and it takes a while for it charge,maybe or the belts just needs replaced. Because I left the charger on it overnight and this morning it fired right up with no squeals.
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Old 07-18-2012, 08:59 AM
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Squeeling belt

This can be a problem on a car driven in frequently. I found the best cure is to keep it plugged ito a maintenance battery charger when not driving every 2 or 3 days.
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Old 07-18-2012, 09:56 AM
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Your chrome pulley is probably the culprit. Try replacing your alternator belt with a notched type v-belt and tension it properly. A notched belt is less likely to slip.
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