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Alternator bolt hole question [message #59582]

Fri, 09 October 2009 21:10

LarryInSanDiego

Messages: 336
Registered: September 2006

Karma: 0

Senior Member

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

http://i30.photobucket.com/albums/c347/LarryInSanDiego/GMCalt.jpg

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 #59586 is a reply to message #59582]

Fri, 09 October 2009 21:21

jimk

Messages: 6734
Registered: July 2006
Location: Belmont, CA

Karma: 9

Senior Member

There should be a threaded hole there. There are two holes in that
area so you can easily miss the correct one.
It should have come with a bolt in that hole from the box

.

On Fri, Oct 9, 2009 at 7:10 PM, Larry Engelbrecht
<lengelbrecht@sandi.net> wrote:
>
>
> 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
> '73 26' ex-Glacier
> TZE063V100319 030773
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>

--
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 #59593 is a reply to message #59582]

Fri, 09 October 2009 22:12

Mr ERFisher

Messages: 7117
Registered: August 2005

Karma: 2

Senior Member

should look like this
http://www.gmcmhphotos.com/photos/showphoto.php?photo=2013

don't forget the spacer

gene

On Fri, Oct 9, 2009 at 7:10 PM, Larry Engelbrecht <lengelbrecht@sandi.net>wrote:

>
>
> 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
> '73 26' ex-Glacier
> TZE063V100319 030773
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>

--
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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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

Karma: 0

Senior Member

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 #59605 is a reply to message #59604]

Sat, 10 October 2009 04:15

Mr ERFisher

Messages: 7117
Registered: August 2005

Karma: 2

Senior Member

All of the alternators I know of, need the spacer. The way to tell if you
need the spacer , is to lay a straight edge across the drive pulleys' to see
if the belt runs straight. Without the spacer the belt will not run
straight.

gene

> 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.
> --
>
>

--
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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Re: [GMCnet] Alternator bolt hole question [message #59608 is a reply to message #59604]

Sat, 10 October 2009 08:14

bumpersticker

Messages: 60
Registered: February 2004
Location: Redondo Beach, CA

Karma: 0

Member

Larry:

Take the alternator back to the store where you got it. The threads have been stripped out and the re-builder didn't catch the problem. I have had several with the same problem. Sometimes the re-builder will catch it and install a threaded insert. 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

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Re: [GMCnet] Alternator bolt hole question [message #59619 is a reply to message #59608]

Sat, 10 October 2009 13:02

Mr ERFisher

Messages: 7117
Registered: August 2005

Karma: 2

Senior Member

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. The threads have
> been stripped out and the re-builder didn't catch the problem. I have had
> several with the same problem. Sometimes the re-builder will catch it and
> install a threaded insert. 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:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>

--
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
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist

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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

Senior Member

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. The threads have
>> been stripped out and the re-builder didn't catch the problem. I have had
>> several with the same problem. Sometimes the re-builder will catch it and
>> install a threaded insert. 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:
>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>>
>
>
>
> --
> 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
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>

--
Jim Kanomata
Applied/GMC, Fremont,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist

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 #59647 is a reply to message #59644]

Sat, 10 October 2009 17:12

LarryInSanDiego

Messages: 336
Registered: September 2006

Karma: 0

Senior Member

Larry Engelbrecht San Diego, CA '73 26' ex-Glacier TZE063V100319 03/07/73

[Updated on: Mon, 12 October 2009 14:35]

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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

Karma: 0

Senior Member

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]

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