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Old 11-29-2020, 11:42 AM   #1
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Churubusco , Indiana
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Classic motorhome alternator pulley

OK, I have been digging at this for awhile and not gotten anywhere. Like many with 80s classic motorhomes and 454 engines, my alternator pulley squeaks. I know from records the alternator was replaced in 2011, and the squeak seems to be from the replacement pulley that comes with most alternators being close enough to work, but slightly different.

WayneG at one point mentioned this
"I also found out that when I changed an alternator a few years earlier, I should have saved the original pulley because the one that came with the new alternator did not have the proper dimensions. I had to find a old style pulley at an alternator shop, no more slippage with this belt and original pulley."

It is assumed that this slippage contributes to heat in the alternator and causes premature failure.

The correct belt is 11A1255 or 11A1195 (depending on length for emissions accessories)

I've been trying to locate the correct pulley online but I have not had luck finding the part number, nor do I have an "alternator shop" that I frequent. There might be a rebuild shop in my city up to the job but I know nothing about them and it might be a potshot.

Anyone know the correct part number? I would like to just get this pulley swapped out while I'm digging around installing the TBI system in the next couple weeks.
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Old 11-30-2020, 09:55 AM   #2
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1974 20' Argosy 20
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Rob,

This makes for an interesting topic. I wonder how many rigs even have their original pulleys anymore. When buying a replacement alternator at a parts store they generally come with pulleys and I wonder just how many people actually verify the new pulley matches the old pulley.

Several coaches that I've owned over the years definitely didn't have the original alternators installed when I owned them and it wouldn't surprise me a bit if the pulleys were the wrong size.

On my Argosy I installed an alternator that originally had a ribbed belt pulley on it so I swapped it out for a pulley that I "estimated" to be the right diameter and belt width. I wouldn't be a bit surprised if mine was not the correct size.

Brad
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Old 12-01-2020, 09:38 AM   #3
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Yep! I'm less worried about diameter, I just want to stop the darn squeaking.
I saw a recent post about making sure it's aligned properly, will give that a check as well
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Old 12-06-2020, 06:12 PM   #4
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1986 34.5' Airstream 345
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I had a heck of a time with alternator belts. I finely was able to put a straight edge across the pulley only to find that the alternator was way out of line with the belt. Went to the old style alternator bracket and the problem went away.
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