01-12-2017, 06:33 PM | #1 |
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Join Date: Sep 2015
Location: Lake Placid florida
Posts: 599
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fan belt question
My engine comes from who knows what original vehicle. I've added aftermarket a/c and p/s. Because of this, when I bought fan belts, I had to measure rather give application. The only belts at the place I got them that were my length were notched, so I got them. 2 of the belts ride high, but I decided to try it out.
So, this morning, I go out to tinker and find that the alt belt has flipped around, with the notches facing away from the pulley! It was 2/3 on the pulley, which was still tight. One or 2 revs and it would have abandoned ship for sure. The engine had been ran for about an hour. I have pictures of the engine after setting it up, and I know for sure that I put it on correctly. At first I thought someone was messing with me, but all my neighbors are cool, and being that I've been working on this project for a year now under a car port and have never had an issue, well I just don't think someone took tools, loosed it up, flipped it around, and put it back together. So I need some opinions. Anyone ever hear about this happening? Some pics are below, 1st the alt pulley. 2nd the p/s pulley 3rd the crank, showing how they ride. The well seated belt is the a/c. I'm guessing I should replace the alt belt, how about the p/s? |
01-12-2017, 08:46 PM | #2 |
Senior Member
Join Date: Jan 2001
Location: Orem, Utah
Posts: 7,805
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Re: fan belt question
The belt on the alternator is definitely too wide. You need a narrower belt.
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01-13-2017, 12:08 AM | #3 |
*** That's interesting ***
Join Date: Oct 2008
Location: Pittsburgh, PA
Posts: 2,772
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Re: fan belt question
Believe it or not, belts do come in different widths. Belts should ride flush with the pulley. If they sink in too far, they are too narrow or worn out. If they ride above too much (as in your case), they are too wide and could sling off. You should be able to take your existing wide belt to a parts store and ask for a different width. You may want to get a few belts that are 1" longer and 1" shorter than your existing belt. The difference in width will also change the accessory tension profile (if you get the same length) and I'm not sure how much fudge factor you have in your accessories. So better to come home with 2 or 3 options and take the ones back you can't use.
The PS belt looks fine. It rides a little high but should be OK. The alt belt is the one that's concerning. If you can't get a correct width belt, the next option is to change the alt pulley.
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Tom Chevy by day... 1969 Chevy C30 Rollback Tow Truck -- 383 stroker, 4L80E 2011 Chevy Caprice PPV 9C3 6.0L 1995 Chevy Caprice 9C1 1994 Chevy Caprice 9C1 #3 1995 Chevy Caprice Wagon #2 1995 Chevy Impala SS Mopar by night... 1969 Dodge Charger 1972 Chrysler Newport 2dr Hardtop (27K miles) Plus others... |
01-13-2017, 01:30 AM | #4 |
Senior Member
Join Date: Jan 2001
Location: Orem, Utah
Posts: 7,805
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Re: fan belt question
Except that the belt will still be too wide for the crank pulley. It's best to get the correct width. I believe the belt on mine was 7/16 wide.
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01-13-2017, 03:24 PM | #5 |
Registered User
Join Date: Sep 2015
Location: Lake Placid florida
Posts: 599
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Re: fan belt question
Thanx for the input. I got one 2 inches shorter and 7 16ths wide and it's perfect.
Still can't figure out how that thing got inverted and didn't come off... |
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