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11-16-2010, 02:21 PM
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#1 |
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Cultural Infidel
 
Join Date: Jan 2007
Location: Clearwater, FL
Posts: 668
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Throwing belts
3 times in the past week the alternator belt has come off, not broken. The first time I replaced it, the alternator was squealing loudly, had the alt. checked, low output, so I upgraded from a 1 wire to a three wire 94amp. At first it seemed fine, but then threw that belt too. I checked the pulley alignment and everything is good. no noises, no pulley wobble, nothing to suggest a problem. Replaced the belt with a different brand and it came off again. Belt tension is good and all looks well but this keeps happening. Any ideas why?
I can't afford to upgrade to serpentine. It's a 350 with alt. on the pass. side, A/C on drivers side. A/C belt doesn't come off, only the alt. belt.
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posted via La-Z-Boy -Mark 1972 C-10 Fleetside 350/TH350 PS PB A/C Cab Sadly....Sold  1968 Short Fleet 350/TH400 PS PB Delivered by Fine69  Also sadly Sold!It may be that your whole purpose in life is simply to serve as a warning to others. A man is not complete until he is married -- then he is finished. |
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11-16-2010, 03:44 PM
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#2 |
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Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: Throwing belts
i'd check your pulleys real good to see if they are spliting and widening the pulley groove causing the belt to run too deep into the pulley causing the belt too come off
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71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY |
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11-16-2010, 08:48 PM
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#3 |
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Cultural Infidel
Join Date: Jan 2007
Location: Clearwater, FL
Posts: 668
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Re: Throwing belts
Checked the pulleys, good and clean, no splits, dents, debris, or cracks.
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posted via La-Z-Boy -Mark 1972 C-10 Fleetside 350/TH350 PS PB A/C Cab Sadly....Sold 1968 Short Fleet 350/TH400 PS PB Delivered by Fine69 Also sadly Sold!It may be that your whole purpose in life is simply to serve as a warning to others. A man is not complete until he is married -- then he is finished. |
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11-16-2010, 08:58 PM
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#4 |
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Between Trucks...
Join Date: Mar 2002
Location: Los Angeles, CA.
Posts: 3,830
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Re: Throwing belts
How's the alignment on the pulleys? If it's slightly off, it'll throw belts.
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Beat it to fit, Paint it to match... 
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11-16-2010, 09:10 PM
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#5 |
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Cultural Infidel
Join Date: Jan 2007
Location: Clearwater, FL
Posts: 668
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Re: Throwing belts
I checked them with a straight edge. This problem showed up all at once, after 500+ miles with no problems.
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posted via La-Z-Boy -Mark 1972 C-10 Fleetside 350/TH350 PS PB A/C Cab Sadly....Sold 1968 Short Fleet 350/TH400 PS PB Delivered by Fine69 Also sadly Sold!It may be that your whole purpose in life is simply to serve as a warning to others. A man is not complete until he is married -- then he is finished. |
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11-16-2010, 09:14 PM
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#6 | |
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Between Trucks...
Join Date: Mar 2002
Location: Los Angeles, CA.
Posts: 3,830
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Re: Throwing belts
Quote:
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Beat it to fit, Paint it to match...
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11-16-2010, 09:28 PM
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#7 |
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Registered User
Join Date: Jan 2005
Location: Australia
Posts: 215
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Re: Throwing belts
I had that exact problem, it had me scratching my head for a while, turned out to be the water pump pulley worn it looked ok but when you compared it to a new one the belt sat a lot taller in the groove
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11-16-2010, 09:28 PM
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#8 |
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Cultural Infidel
Join Date: Jan 2007
Location: Clearwater, FL
Posts: 668
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Re: Throwing belts
It is very puzzling. Most of these problems seem obvious in hindsight, but finding the cause is frustrating. At least now that I have a 3 wire alt., I get a big red warning light when it comes off!
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posted via La-Z-Boy -Mark 1972 C-10 Fleetside 350/TH350 PS PB A/C Cab Sadly....Sold 1968 Short Fleet 350/TH400 PS PB Delivered by Fine69 Also sadly Sold!It may be that your whole purpose in life is simply to serve as a warning to others. A man is not complete until he is married -- then he is finished. |
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11-16-2010, 09:30 PM
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#9 |
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Cultural Infidel
Join Date: Jan 2007
Location: Clearwater, FL
Posts: 668
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Re: Throwing belts
All pulleys were replaced 500 miles ago.
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posted via La-Z-Boy -Mark 1972 C-10 Fleetside 350/TH350 PS PB A/C Cab Sadly....Sold 1968 Short Fleet 350/TH400 PS PB Delivered by Fine69 Also sadly Sold!It may be that your whole purpose in life is simply to serve as a warning to others. A man is not complete until he is married -- then he is finished. |
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11-16-2010, 09:32 PM
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#10 |
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Registered User
Join Date: Jan 2005
Location: Australia
Posts: 215
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Re: Throwing belts
P.S the sqealing you hear is from the belt slipping, so if your belt tension is correct the belt isn't making full contact on the pulley hence the noise
I thought it was my altenator for a while to but it turned out to be the pump pulley |
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11-16-2010, 09:32 PM
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#11 |
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Registered User
Join Date: Jan 2005
Location: Australia
Posts: 215
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Re: Throwing belts
Are the pulleys chrome ?
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11-16-2010, 09:35 PM
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#12 |
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Cultural Infidel
Join Date: Jan 2007
Location: Clearwater, FL
Posts: 668
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Re: Throwing belts
water pump pulley is chrome.
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posted via La-Z-Boy -Mark 1972 C-10 Fleetside 350/TH350 PS PB A/C Cab Sadly....Sold 1968 Short Fleet 350/TH400 PS PB Delivered by Fine69 Also sadly Sold!It may be that your whole purpose in life is simply to serve as a warning to others. A man is not complete until he is married -- then he is finished. |
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11-16-2010, 09:38 PM
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#13 |
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Registered User
Join Date: Jan 2005
Location: Australia
Posts: 215
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Re: Throwing belts
It might pay too sand the groove with some emery paper to roughen it up, I would suspect the belt is slipping on the chrome, I have heard of this happening before
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11-16-2010, 09:42 PM
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#14 |
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Cultural Infidel
Join Date: Jan 2007
Location: Clearwater, FL
Posts: 668
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Re: Throwing belts
Thanks for the suggestion, I did that this morning before throwing the 3rd belt. Keep the ideas coming.
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posted via La-Z-Boy -Mark 1972 C-10 Fleetside 350/TH350 PS PB A/C Cab Sadly....Sold 1968 Short Fleet 350/TH400 PS PB Delivered by Fine69 Also sadly Sold!It may be that your whole purpose in life is simply to serve as a warning to others. A man is not complete until he is married -- then he is finished. |
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11-16-2010, 09:51 PM
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#15 |
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Registered User
Join Date: Jan 2005
Location: Australia
Posts: 215
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Re: Throwing belts
Geeezzz!! I know how you feel, it's pretty frustrating, if the belt is sqealing it's definetley a contact issue or something is seizing up causing it to jump off, I would be guessing you have checked the water pump ?
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11-16-2010, 09:57 PM
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#16 |
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Weekend Warrior
Join Date: Oct 2004
Location: CT
Posts: 1,787
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Re: Throwing belts
does the waterpump pulley have 2 grooves? - one for the Alt & one for the PS or A/C? or just one for the Alt?
I had a problem with a customer's vehicle, the crank pulley had a different diameter outer pulley and the w/p pulley had 2 grooves the same size. The belts were turning different RPM's and it would throw one of them every 500 miles or so.
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-'07 GMC Sierra K2500HD -'66 C10 Suburban -'68/'71 K20 Service Bed Project -'69 Chevy C30 Mason Dump -'33Ford P/U 396ChevyPowered   
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11-16-2010, 10:39 PM
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#17 |
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Cultural Infidel
Join Date: Jan 2007
Location: Clearwater, FL
Posts: 668
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Re: Throwing belts
2 grooves both the same size pump & crank pulleys, pump is fine, no squeal after alt. replaced. Notched belt, haven't tried Top Cog style yet.
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posted via La-Z-Boy -Mark 1972 C-10 Fleetside 350/TH350 PS PB A/C Cab Sadly....Sold 1968 Short Fleet 350/TH400 PS PB Delivered by Fine69 Also sadly Sold!It may be that your whole purpose in life is simply to serve as a warning to others. A man is not complete until he is married -- then he is finished. |
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11-17-2010, 01:09 AM
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#18 |
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Registered User
Join Date: Aug 2007
Location: branson mo
Posts: 933
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Re: Throwing belts
Even though you checked the alignment with a straight edge, i think you may still have a mal aligned pulley. It will probably be the alt pulley. Even though the top of the pulley may be lined up with your water pump pulley if you look at the pulley from the side, the lower part of the pulley might be further in than the upper, or visa versa. Like this \ as opposed to this |. I would recommend buying a new bracket assembly. They make chrome ones for less than 30 bucks at o rielys...
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