Alternator bolt hole question [message #59582] |
Fri, 09 October 2009 21:10 |
LarryInSanDiego
Messages: 336 Registered: September 2006
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The rear bracket for the 80 amp alt in my '73 has a slot that appears to accommodate a bolt that would go in the hole indicated by the red arrow shown here
The hole is slightly larger than 5/16" and unthreaded. Is this perhaps the wrong alt?
Larry Engelbrecht
San Diego, CA
'73 26' ex-Glacier
TZE063V100319 03/07/73
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Re: [GMCnet] Alternator bolt hole question [message #59604 is a reply to message #59593] |
Sat, 10 October 2009 00:37 |
LarryInSanDiego
Messages: 336 Registered: September 2006
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Thanks guys. The 100A alt at Kragen had a bolt in that same hole. I don't have a clue why that hole would be unthreaded. If there's enough inside clearance, I might stick a 5/16" bolt from the inside out.
Btw, no spacer needed. The raised boss is right up against the lower rear bracket. I don't have the upper one shown in your pic - something to add on the list next time I hit the Men's Mall.
Larry Engelbrecht
San Diego, CA
'73 26' ex-Glacier
TZE063V100319 03/07/73
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Re: [GMCnet] Alternator bolt hole question [message #59644 is a reply to message #59619] |
Sat, 10 October 2009 16:43 |
jimk
Messages: 6734 Registered: July 2006 Location: Belmont, CA
Karma: 9
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Gene, I think he is trying to shove it in the wrong hole.
On Sat, Oct 10, 2009 at 11:02 AM, Mr.erf ERFisher <mr.erfisher@gmail.com> wrote:
> here is another view of the alternator
> http://gmcmotorhome.info/engine.html#bracket
>
> gene
>
>
>
> On Sat, Oct 10, 2009 at 6:14 AM, Bob Cook <bcgmc@verizon.net> wrote:
>
>>
>>
>> Larry:
>>
>> Take the alternator back to the store where you got it. Â The threads have
>> been stripped out and the re-builder didn't catch the problem. Â I have had
>> several with the same problem. Â Sometimes the re-builder will catch it and
>> install a threaded insert. Â The problem started when GM changed the design
>> from SAE threads to metric and someone put in the wrong bolt.
>> --
>> Bob Cook
>> 78 Birchaven
>> 75 Avion (In work)
>> Redondo Beach, CA
>> _______________________________________________
>> GMCnet mailing list
>> List Information and Subscription Options:
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>
>
>
> --
> Gene Fisher -- 74-23,77PB/ore/ca
> “Give a man a fish; you have fed him for today --- give him a URL and
> -------
> http://gmcmotorhome.info/
> Alternator Protection Cable
> http://gmcmotorhome.info/APC.html
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--
Jim Kanomata
Applied/GMC, Fremont,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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Re: [GMCnet] Alternator bolt hole question [message #59805 is a reply to message #59647] |
Sun, 11 October 2009 20:26 |
LarryInSanDiego
Messages: 336 Registered: September 2006
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Okay, time for update:
I modded a 5/16" bolt head for voltage regulator and brush holder clearance (it's inserted from the inside sticking out the back).
I did this mod because this alt came with the coach when I bought it 3 years ago and it's obviously used, so no exchanging it at whatever parts store. Brushes had plenty of meat and all appeared well, so back together it went and re-installed.
I verified alt alignment and parallelism - no spacer needed. That boss butts right up against the lower rear bracket. Perhaps the alt and brackets are a muttly mix by a prior PO, but everything on this combo checked out.
I'll look out for that upper rear bracket when it's MM time. That that lower rear attachment sure helped rigidity a bunch.
Thanks to all for the heads up and advice!
Btw, somewhere was mentioned about required changes for the 145 amp alt, which I'd consider when the time does come for replacing this one (80A). Can anyone point me to more info about that?
Larry Engelbrecht
San Diego, CA
'73 26' ex-Glacier
TZE063V100319 03/07/73
[Updated on: Sun, 11 October 2009 20:30] Report message to a moderator
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