Home » Public Forums » GMCnet » [GMCnet] Cadillac serpentine belt conversion
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| Re: [GMCnet] Cadillac serpentine belt conversion [message #252605 is a reply to message #252598] |
Thu, 19 June 2014 06:10   |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Gary,
I need to be sure I understand the alternator tensioner; please correct
this description:
The hex stock (1/2 FOOT long?) is threaded in one end to accept the
threaded rod end for adjustment, with the hex nut to lock it. The other
end is bored smooth to accept the unthreaded rod with the compression
spring over it. That smooth bore is lubricated so the rod moves in and out
freely to keep the serpentine belt tight.
I haven't yet had a chance to check whether such a tensioner will work on
my setup; I hope so.
Thanks,
Ken H.
On Thu, Jun 19, 2014 at 12:58 AM, Kosier wrote:
> Hi Cadillac fans,
>
> Finished my serpentine belt conversion. Pics and info at
> www.gmcmhphotos.com/photos/g6621-serpentine-belt-conversion.html
>
> Gary Kosier
> 77 PB w/500 Cad
> Newark, Oh
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] Cadillac serpentine belt conversion [message #252613 is a reply to message #252605] |
Thu, 19 June 2014 07:53 |
GMC.LES
Messages: 505
Registered: April 2014
Karma: -2
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Senior Member |
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If that is indeed the set-up, i would be worried (maybe for nothing) about long term wear in the alternator pivot from having the necessary loose pivot bolt. Engine and drivebelt vibrations are going to put that pivot through hell. Most factory self-adjusting belt tensioners have a bushed & lubricated pivot designed to constantly move.
Aside from the alternator pivot issue, I like the set-up. I can see that lots of time has been invested in getting it to this point.
Les Burt
Montreal
1975 Eleganza 26ft
A work in Progress
On Jun 19, 2014, at 7:10 AM, Ken Henderson wrote:
Gary,
I need to be sure I understand the alternator tensioner; please correct
this description:
The hex stock (1/2 FOOT long?) is threaded in one end to accept the
threaded rod end for adjustment, with the hex nut to lock it. The other
end is bored smooth to accept the unthreaded rod with the compression
spring over it. That smooth bore is lubricated so the rod moves in and out
freely to keep the serpentine belt tight.
I haven't yet had a chance to check whether such a tensioner will work on
my setup; I hope so.
Thanks,
Ken H.
> On Thu, Jun 19, 2014 at 12:58 AM, Kosier wrote:
>
> Hi Cadillac fans,
>
> Finished my serpentine belt conversion. Pics and info at
> www.gmcmhphotos.com/photos/g6621-serpentine-belt-conversion.html
>
> Gary Kosier
> 77 PB w/500 Cad
> Newark, Oh
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| Re: [GMCnet] Cadillac serpentine belt conversion [message #252657 is a reply to message #252605] |
Thu, 19 June 2014 16:55 |
Kosier
Messages: 834
Registered: February 2008
Karma: 1
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Senior Member |
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Ken,
First, the shortest piece of hex stock from McMaster-Carr is one-half
foot. Since I needed two six inch pieces, that's what I got.
I drilled each piece completely through 25/64". This gave clearance
for the 3/8" blank rod eye. It's also the tap size for a e/8" heli-coil.
So I tapped one end for the 3/8" heli-coil and installed it. This gave
me a sleeve to slide over the blank and compress the die spring.
I found that was a little close, so I ran a 13/32" drill in the unthreaded
portion. I hope this is a little bit clearer explanation.
Gary
-----Original Message-----
From: Ken Henderson
Sent: Thursday, June 19, 2014 7:10 AM
To: gmclist
Subject: Re: [GMCnet] Cadillac serpentine belt conversion
Gary,
I need to be sure I understand the alternator tensioner; please correct
this description:
The hex stock (1/2 FOOT long?) is threaded in one end to accept the
threaded rod end for adjustment, with the hex nut to lock it. The other
end is bored smooth to accept the unthreaded rod with the compression
spring over it. That smooth bore is lubricated so the rod moves in and out
freely to keep the serpentine belt tight.
I haven't yet had a chance to check whether such a tensioner will work on
my setup; I hope so.
Thanks,
Ken H.
On Thu, Jun 19, 2014 at 12:58 AM, Kosier wrote:
> Hi Cadillac fans,
>
> Finished my serpentine belt conversion. Pics and info at
> www.gmcmhphotos.com/photos/g6621-serpentine-belt-conversion.html
>
> Gary Kosier
> 77 PB w/500 Cad
> Newark, Oh
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| Re: [GMCnet] Cadillac serpentine belt conversion [message #252660 is a reply to message #252613] |
Thu, 19 June 2014 17:15 |
Kosier
Messages: 834
Registered: February 2008
Karma: 1
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Senior Member |
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Les,
Unless something is out of round, the only movement should be very slight
and very slow as a result of belt stretch.
We did the pulley mods on the lathe, so it's all concentric. It's amazing
how well it all worked out when it's just
shade tree engineering. Occasionally a blind squirrel will fall into a
large pile of acorns.LOL
Gary Kosier
77 PB w/ 500 Cad
Newark, Oh
From: Les Burt
Sent: Thursday, June 19, 2014 8:53 AM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Cadillac serpentine belt conversion
If that is indeed the set-up, i would be worried (maybe for nothing) about
long term wear in the alternator pivot from having the necessary loose pivot
bolt. Engine and drivebelt vibrations are going to put that pivot through
hell. Most factory self-adjusting belt tensioners have a bushed & lubricated
pivot designed to constantly move.
Aside from the alternator pivot issue, I like the set-up. I can see that
lots of time has been invested in getting it to this point.
Les Burt
Montreal
1975 Eleganza 26ft
A work in Progress
On Jun 19, 2014, at 7:10 AM, Ken Henderson wrote:
Gary,
I need to be sure I understand the alternator tensioner; please correct
this description:
The hex stock (1/2 FOOT long?) is threaded in one end to accept the
threaded rod end for adjustment, with the hex nut to lock it. The other
end is bored smooth to accept the unthreaded rod with the compression
spring over it. That smooth bore is lubricated so the rod moves in and out
freely to keep the serpentine belt tight.
I haven't yet had a chance to check whether such a tensioner will work on
my setup; I hope so.
Thanks,
Ken H.
> On Thu, Jun 19, 2014 at 12:58 AM, Kosier wrote:
>
> Hi Cadillac fans,
>
> Finished my serpentine belt conversion. Pics and info at
> www.gmcmhphotos.com/photos/g6621-serpentine-belt-conversion.html
>
> Gary Kosier
> 77 PB w/500 Cad
> Newark, Oh
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| Re: [GMCnet] Cadillac serpentine belt conversion [message #252726 is a reply to message #252657] |
Fri, 20 June 2014 00:21 |
Kosier
Messages: 834
Registered: February 2008
Karma: 1
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Senior Member |
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Darn it, that should have been two 3" pieces. That equals
one six inch piece. Talk about dumb!
Gary
-----Original Message-----
From: Kosier
Sent: Thursday, June 19, 2014 5:55 PM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Cadillac serpentine belt conversion
Ken,
First, the shortest piece of hex stock from McMaster-Carr is one-half
foot. Since I needed two six inch pieces, that's what I got.
I drilled each piece completely through 25/64". This gave clearance
for the 3/8" blank rod eye. It's also the tap size for a e/8" heli-coil.
So I tapped one end for the 3/8" heli-coil and installed it. This gave
me a sleeve to slide over the blank and compress the die spring.
I found that was a little close, so I ran a 13/32" drill in the unthreaded
portion. I hope this is a little bit clearer explanation.
Gary
-----Original Message-----
From: Ken Henderson
Sent: Thursday, June 19, 2014 7:10 AM
To: gmclist
Subject: Re: [GMCnet] Cadillac serpentine belt conversion
Gary,
I need to be sure I understand the alternator tensioner; please correct
this description:
The hex stock (1/2 FOOT long?) is threaded in one end to accept the
threaded rod end for adjustment, with the hex nut to lock it. The other
end is bored smooth to accept the unthreaded rod with the compression
spring over it. That smooth bore is lubricated so the rod moves in and out
freely to keep the serpentine belt tight.
I haven't yet had a chance to check whether such a tensioner will work on
my setup; I hope so.
Thanks,
Ken H.
On Thu, Jun 19, 2014 at 12:58 AM, Kosier wrote:
> Hi Cadillac fans,
>
> Finished my serpentine belt conversion. Pics and info at
> www.gmcmhphotos.com/photos/g6621-serpentine-belt-conversion.html
>
> Gary Kosier
> 77 PB w/500 Cad
> Newark, Oh
_______________________________________________
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http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
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| Re: [GMCnet] Cadillac serpentine belt conversion [message #252844 is a reply to message #252838] |
Sat, 21 June 2014 10:50 |
Kosier
Messages: 834
Registered: February 2008
Karma: 1
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Senior Member |
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I would have to think that any belt will generate heat as it is constantly
being flexed around a corner.
When heated, it would probably stretch a little. A V belt, having a fixed
adjustment, will undoubtedly
get loose and slip a little. That will generate more heat, thus more slip,
etc. The serpentine belt
has more surfaces to grip at the start and usually has a spring loaded
idler, which maintains the
tension. All in all, the serpentine seems very durable and trouble-free for
a long time.
At least, that's been my experience. YMMV
Gary Kosier
77 PB w/500 Cad
Newark, Oh
-----Original Message-----
From: A.
Sent: Saturday, June 21, 2014 10:52 AM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Cadillac serpentine belt conversion
Sort of related question: Does a serpentine belt slip less on the
alternator when it is putting out a lot of amps?
--
'73 23' Sequoia For Sale
'73 23' CanyonLands For Sale
Upper Alabama
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