Home » Public Forums » GMCnet » [GMCnet] VBelt Supply
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| Re: [GMCnet] VBelt Supply [message #280746 is a reply to message #280726] |
Thu, 25 June 2015 23:52   |
George Beckman
Messages: 1085
Registered: October 2008
Location: Colfax, CA
Karma: 11
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Ken Henderson wrote on Thu, 25 June 2015 17:35I mentioned VBeltSupply.com in the past couple of days. I just got from
them a sale announcement: Use the code "BEFORE4" for a 10% discount. TIme
to get those spare wide-enough belts. 
Ken H.
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Ken,
I have not (yet) had to change belts. However I have had to change alternators about 304 times. (Current one has about 2500 miles, a super record. Too bad I can't find a fan clutch with this longevity. And yes, I have tried every fan clutch mentioned here on the forum. The current one is takes first place as it has never engaged once, even when the temp was 230* F)
My problem is that every time I get an alternator, i have to remove the "stock" pulley and replace it with my larger pulley. If I did not there is no way the existing belt would tighten properly.
So my question is, what size sheave is "stock" for a 455? And yes I know you have a 500 Cad but I also know you know stuff.
'74 Eleganza, SE, Howell + EBL
Best Wishes,
George
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| Re: [GMCnet] VBelt Supply [message #280754 is a reply to message #280746] |
Fri, 26 June 2015 05:48 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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George,
Before I get dressed & go to the shop to measure an old 455 alternator
pulley, let me ask a couple of questions:
1. If your "stock" pulley is larger, it's running the alternator slower
than those you replace -- don't you expect that to reduce the output of the
alternator?
2. Instead of continuing to replace pulleys, why don't you just get a
longer belt?
3. In view of 1., preceding, if you do 2., preceding, maybe you can reduce
that excessive longevity to near zero thanks to the higher alternator speed.
I'll try to send you a number after breakfast -- IF memory don't fail.
Ken H.
On Fri, Jun 26, 2015 at 12:52 AM, George Beckman wrote:
Ken,
>
> I have not (yet) had to change belts. However I have had to change
> alternators about 304 times. (Current one has about 2500 miles, a super
> record. Too
> bad I can't find a fan clutch with this longevity. And yes, I have tried
> every fan clutch mentioned here on the forum. The current one is takes first
> place as it has never engaged once, even when the temp was 230* F)
>
> My problem is that every time I get an alternator, i have to remove the
> "stock" pulley and replace it with my larger pulley. If I did not there is
> no
> way the existing belt would tighten properly.
>
> So my question is, what size sheave is "stock" for a 455? And yes I know
> you have a 500 Cad but I also know you know stuff.
> --
>
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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] VBelt Supply [message #280755 is a reply to message #280754] |
Fri, 26 June 2015 07:22 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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George,
Sorry, but I'm not much help: The only alternator I could find with a
V-belt pulley is of dubious ancestry; may be Cad or Olds. At any rate, its
OD is 2-5/8". Most pulleys around here are serpentine since that's all
I've run for 10 years or so.
Are you monitoring current flow? Something's not right for you to be going
through that many alternators; I haven't had a problem with one in many
years (if memory serves well).
Ken H.
On Fri, Jun 26, 2015 at 6:48 AM, Ken Henderson
wrote:
> George,
>
> Before I get dressed & go to the shop to measure an old 455 alternator
> pulley, let me ask a couple of questions:
>
> 1. If your "stock" pulley is larger, it's running the alternator slower
> than those you replace -- don't you expect that to reduce the output of the
> alternator?
>
> 2. Instead of continuing to replace pulleys, why don't you just get a
> longer belt?
>
> 3. In view of 1., preceding, if you do 2., preceding, maybe you can
> reduce that excessive longevity to near zero thanks to the higher
> alternator speed.
>
> I'll try to send you a number after breakfast -- IF memory don't fail.
>
> Ken H.
>
> On Fri, Jun 26, 2015 at 12:52 AM, George Beckman
> wrote:
>
> Ken,
>>
>> I have not (yet) had to change belts. However I have had to change
>> alternators about 304 times. (Current one has about 2500 miles, a super
>> record. Too
>> bad I can't find a fan clutch with this longevity. And yes, I have tried
>> every fan clutch mentioned here on the forum. The current one is takes first
>> place as it has never engaged once, even when the temp was 230* F)
>>
>> My problem is that every time I get an alternator, i have to remove the
>> "stock" pulley and replace it with my larger pulley. If I did not there is
>> no
>> way the existing belt would tighten properly.
>>
>> So my question is, what size sheave is "stock" for a 455? And yes I know
>> you have a 500 Cad but I also know you know stuff.
>> --
>>
>
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Unsubscribe or Change List Options:
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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] VBelt Supply [message #280822 is a reply to message #280755] |
Sat, 27 June 2015 01:52 |
George Beckman
Messages: 1085
Registered: October 2008
Location: Colfax, CA
Karma: 11
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Senior Member |
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Ken Henderson wrote on Fri, 26 June 2015 05:22George,
Sorry, but I'm not much help: The only alternator I could find with a
V-belt pulley is of dubious ancestry; may be Cad or Olds. At any rate, its
OD is 2-5/8".
Are you monitoring current flow? Something's not right for you to be going
through that many alternators; I haven't had a problem with one in many
years (if memory serves well).
Ken H.
Ken,
The pulley is larger, so going to a stock pulley the alternator would run slower. Not necessarily bad.
I watch the voltage. Each failure begins with voltage starting to jump around. I assume it is bad diodes. I tried Delco (remanufactured in MI) O'Reilly's. Auto Zone, a local shop and NAPA. Almost all had whiny bearings. The O'Reilly's is actually running the longest. It still has a bit of whine at 2400 RPMs. It is a higher amperage and the voltage rarely twitches. My coach is a '74 so it is that big Caddy rig.
Thanks for trying to help. I was hoping a standard belt with a stock pulley would solve the problem.
'74 Eleganza, SE, Howell + EBL
Best Wishes,
George
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