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  #16 (permalink)  
Old 09-01-2008, 10:21 PM
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Quote:
Originally Posted by curtis73
I have the answer. What do I get if I'm right?

I'll bet $5 that you have a pretty pulley; polished aluminum or chrome? They consistently don't grip the belt. You'll notice inconsistent voltage depending on the belt's temp, but the one thing you will always notice is a screaming hot pulley and sometimes a melted belt.

I work at a custom shop and every time like clockwork the customer asks for a pretty pulley, and every time I have to sand the groove of the pulley. If I forget I always get 11-12v and a nice burn on my hands when I investigate the pulley. Left alone, the belt will go in and out of times when it grips and when its either melting or slipping.

The other likely possibility has been mentioned; high RPMs and either slightly misaligned pulleys or a slightly loose belt could have caused the belt to flip which will melt it as well.
I have seen this before

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  #17 (permalink)  
Old 09-02-2008, 12:54 AM
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curtis 73 it right, polished aluminum/chrome pulley will cause this problem. slight mis-alignment of the pulleys will also cause the belt to twist at high RPM.

one thing nobody mentioned, there are standard and deep groove pulleys-are they all the same groove widths???
there are also 3 different width belts to fit the pulleys, 13-15-17/32nds. make sure all your pulley widths are the same and you are running the right width belt. you may have a different groove width on that aftermarket alt. pulley...
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  #18 (permalink)  
Old 09-02-2008, 05:27 AM
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GM had problems in the early 80s when they started using the 80 or 90? amp alternators with the common v belt drive. You could not seem to get a conventional v belt to last without slipping. I had one of these cars new, and I used a v belt that had the "cogs" on the flat side. I don't recall the brand of belt, but look for that style. That belt worked slick.

If it's a chrome pulley, I would remove it if possible, and sandblast the inside v part to get all the chrome off.


EDIT, I think the slipping with high output v belt alternators is the reason they all switched to serpentine belts a few years later.
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  #19 (permalink)  
Old 09-02-2008, 06:02 AM
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Quote:
Originally Posted by curtis73
I have the answer. What do I get if I'm right?

I'll bet $5 that you have a pretty pulley; polished aluminum or chrome? They consistently don't grip the belt. You'll notice inconsistent voltage depending on the belt's temp, but the one thing you will always notice is a screaming hot pulley and sometimes a melted belt.

I work at a custom shop and every time like clockwork the customer asks for a pretty pulley, and every time I have to sand the groove of the pulley. If I forget I always get 11-12v and a nice burn on my hands when I investigate the pulley. Left alone, the belt will go in and out of times when it grips and when its either melting or slipping.

The other likely possibility has been mentioned; high RPMs and either slightly misaligned pulleys or a slightly loose belt could have caused the belt to flip which will melt it as well.

I have a pretty pulley for the ps and it will slip and it flips over and I just left it has been that way for the past year. It does have a shallow groove oh well Ed
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