| Alternator bearing failure .! [message #364473] |
Thu, 03 June 2021 16:47  |
Gregory keller
Messages: 12
Registered: July 2019
Karma: 0
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My one year old Delco alternator bearing froze up and burned up the belt . Thank goodness no other damage was caused when the belt went flying . Is there a bearing problems with these alternators ?
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| Re: Alternator bearing failure .! [message #364474 is a reply to message #364473] |
Thu, 03 June 2021 18:49  |
blur911
Messages: 166
Registered: December 2020
Location: Kingston, Ontario
Karma: 4
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Gregory keller wrote on Thu, 03 June 2021 16:47My one year old Delco alternator bearing froze up and burned up the belt . Thank goodness no other damage was caused when the belt went flying . Is there a bearing problems with these alternators ?
I've been told that AC Delco often equals Chines junk now. Was it a rebuild?
Burl Vibert
Kingston, Ontario
1976 GMC 26 foot, Sheridan reno, don't know original model but we call her Roxie
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| [GMCnet] Re: Alternator bearing failure .! [message #364476 is a reply to message #364475] |
Thu, 03 June 2021 19:24 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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I ALWAYS use an independent local rebuilder whom I have used for many
years. Clear back into the 6 volt GENERATOR AND SEPARATE REGULATOR days. I
have had very little issues with their work. THEY AIN'T CHEAP! When you
buy a Chinese $29.95 over the counter, one size fits all, alternators, etc.
You makes no difference if it has a lifetime warranty. Take the burned up
one back, and they give you another just like it. No matter if it cooks
when you are at the ends of the earth, not their problem.
Jim Hupy
Salem, Oregon
On Thu, Jun 3, 2021, 5:16 PM Matt Colie wrote:
> Gregory keller wrote on Thu, 03 June 2021 17:47
>> My one year old Delco alternator bearing froze up and burned up the
> belt . Thank goodness no other damage was caused when the belt went flying
> .
>> Is there a bearing problems with these alternators ?
>
> Gregory,
>
> I am glad to hear that the peripheral damage was minimal.
> I would love to hear more about this.
> The bearing of a 27SI has never been a noted weak point.
>
> Matt
> --
> Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL,
> GMCES
> Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum
> Brakes with Applied Control Arms
> SE Michigan - Near DTW - Twixt A2 and Detroit
> _______________________________________________
> GMCnet mailing list
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| Re: Alternator bearing failure .! [message #364478 is a reply to message #364473] |
Thu, 03 June 2021 20:02 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Senior Member |
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I used an independent builder. Me. Bearings and brushes from NAPA per parts interchanger. These 80A are no more prone to problems than any other alternator. Chain store rebuilds are always a gamble.
John Lebetski
Woodstock, IL
77 Eleganza II
[Updated on: Thu, 03 June 2021 20:05] Report message to a moderator |
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| Re: Alternator bearing failure .! [message #364480 is a reply to message #364473] |
Thu, 03 June 2021 20:39 |
TR 1
Messages: 348
Registered: August 2015
Location: DFW
Karma: -7
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Senior Member |
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It's looking like this may have been caused by an inferior bearing...
However, for the sake of argument, assuming it is not a cheap bearing, you could also look at the alignment of the alternator pulley... If the alternator bracket was cracked or bent in some way canting the alternator out of plane with the rest of the pulleys, the side load from the misalignment could burn up a bearing...
Mark S. '73 Painted Desert,
Manny 1 Ton Front End,
Howell Injection,
Leigh Harrison 4bag and Rear Brakes,
Fort Worth, TX
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| Re: Alternator bearing failure .! [message #370467 is a reply to message #364473] |
Sat, 10 September 2022 10:51 |
kstockwell
Messages: 367
Registered: May 2016
Location: Putney VT
Karma: 4
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Senior Member |
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I recently replaced my alternator and the new one makes a whirring noise that changes with engine speed (it's putting out 13.9-14.3 volts, the old one was going up to 15.5). We could hear it clicking before install, but i was at a campsite and this is the one i could order and have the next day.
What should I look out for? Should I change it out now or keep an eye on the voltages?
78 Kingsley
1978 Kingsley
Putney VT
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| Re: Alternator bearing failure .! [message #370493 is a reply to message #364473] |
Tue, 13 September 2022 09:53 |
bdub
Messages: 1578
Registered: February 2004
Location: Central Texas
Karma: 5
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Senior Member |
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I had one do that. Took two complete sets of belts before I figured out what the deal was. After getting hot, the bearing would freeze up, burn up the alternator belt which in turn shelled out the other two belts. Rebuilt alternator solved that problem.
It was a hard earned lesson.
bdub
'76 Palm Beach/Central Texas
www.bdub.net
www.gmcmhphotos.com
www.gmcmotorhomemarketplace.com
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