Home » Public Forums » GMCnet » [GMCnet] Dual alternator belt pulley
| [GMCnet] Dual alternator belt pulley [message #64376] |
Sun, 15 November 2009 18:32  |
 |
USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
|
Senior Member |
|
|
G’day,
To make this easier to find I created a new message.
Here’s the blurb from Gene Fishers website:
Dual Belt Alternator Pulley
I have always had problems with the alternator belts on my 80 Amp
alternators. When I replaced the last 80Amp alternator with a 100Amp unit I
decided to replace the single belt pulley (that comes with the 100 Amp
alternator) with a dual belt pulley. The pulley I found is a bolt-on
replacement made of machined steel, 2 5/8" dia., part number 1101,
manufactured by BBB Industries. It costs $7.88 and can be ordered from Kevin
at Hedahls Auto Parts in Bismark, ND. http://www.hedahls.com/
(800-472-2112). The 2 5/8" diameter pulley is small enough so that the 100
Amp alternator will generate 80+ amps at engine idle.
When I replaced the alternator I also replaced my belts with two Gates
XL-7570 (3/8" x 57-5/8") for the alternator & PS pump and one Gates XL-7619
(3/8" x 62-1/2") belt for the A/C compressor.
I only have about 3K miles on the 100 amp alternator with a dual pulley but
so far so good. Even with the alternator putting out a full 100Amps my belts
stay put and make no noise.
I would suggest replacing all of your belts with new ones. My experience is
that when you mix old and new belts, the old and new belts will be slightly
different sizes. That causes the older belts to ride deeper in the shiv and
the new belts to ride higher on the shiv. Thus the new and old belts fight
each other. Since two of my belts share all pulleys, and three belts share
pulleys at both the crank and the water pump, I replaced all of my belts
with new ones. Dave
I fitted a dual pulley on Double Trouble and that was the end of my
generator belt problems. To make sure I got the max contact with the power
steering pump I pushed it away from the block as far as its adjustment would
allow; no problems with that either.
It has been recommended that you get two belts from the same batch so that
they will be the same length and that is a good idea. I did not do that, I
fitted one new belt and left the old belt. The new belt stretched out to the
length of the old belt fairly quickly and then they stayed the same. That
was about 5000 miles ago!
Regards,
Rob Mueller
Sydney, Australia
AUS '75 Avion-The Blue Streak TZE365V100428
USA '75 Avion-Double Trouble TZE365V100426
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
|
|
|
|
|
|
| Re: [GMCnet] Dual alternator belt pulley [message #64387 is a reply to message #64376] |
Sun, 15 November 2009 19:43  |
Ray Erspamer
Messages: 1707
Registered: May 2007
Location: Milwaukee Wisconsin
Karma: -3
|
Senior Member |
|
|
I converted to the dual pulley last year, haven't heard a belt squeal since.
Ray & Lisa Erspamer
78 Royale Center Kitchen
The Malosco Cruiser (TZE368V101144)
Wauwatosa, Wisconsin 53226
Email: 78GMC-Royale@att.net
414-745-3188
Web Site: http://ray-lisa.page.tl/
________________________________
From: Larry Davick <ljdavick@comcast.net>
To: gmclist@temp.gmcnet.org
Sent: Sun, November 15, 2009 7:39:17 PM
Subject: Re: [GMCnet] Dual alternator belt pulley
I'll watch this thread with great interest. Tom Hampton replaced all
of my belts in Ohio. By the time we got to Missouri the belts had
stretched enough that on start up she would squeal like a banshe.
While the Palm Beast was at Jim K's place for the fuel lines I ask if
they could adjust the belts - great for a few weeks and squealing again.
She's a talkative rig!
Larry Davick
The Mystery Machine
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Ray Erspamer
78 GMC Royale Center Kitchen
403, 3.70 Final Drive
Holley Sniper Quadrajet EFI System,
Holley Hyperspark Ignition System
414-484-9431
|
|
|
|
| Re: [GMCnet] Dual alternator belt pulley [message #64396 is a reply to message #64376] |
Sun, 15 November 2009 20:22 |
Jim White[1]
Messages: 144
Registered: September 2008
Karma: 0
|
Senior Member |
|
|
After putting up with considerable squealing noise and some gen light
glowing at high speeds, I bought a dual pulley, bought proper width
belts and the noise went away. After about 500 miles, the power steering
pump started moaning like an old girlfriend, but only at slow speeds
(the coach, not the girl.) I laugh every time it happens and my wife
wants to know what I'm laughing at. At first it sounded like the fender
well liner was rubbing against a tire but after realizing that it only
happens at slow speed, I have been able to make it happen by just doing
any turn at slow RPM.
Well, it's an improvement over belt noise but I'm not sure that simply
replacing the old belts with the correct size belts wouldn't have
eliminated the squealing.
What to do?
Jim "Doc" White
Wintergreen, VA
75 GMC stretch (which moans like an old girlfriend)
********************
Rob Mueller wrote:
> G’day,
>
> To make this easier to find I created a new message.
>
> Here’s the blurb from Gene Fishers website:
>
> Dual Belt Alternator Pulley
> I have always had problems with the alternator belts on my 80 Amp
> alternators. When I replaced the last 80Amp alternator with a 100Amp unit I
> decided to replace the single belt pulley (that comes with the 100 Amp
> alternator) with a dual belt pulley. The pulley I found is a bolt-on
> replacement made of machined steel, 2 5/8" dia., part number 1101,
> manufactured by BBB Industries. It costs $7.88 and can be ordered from Kevin
> at Hedahls Auto Parts in Bismark, ND. http://www.hedahls.com/
> (800-472-2112). The 2 5/8" diameter pulley is small enough so that the 100
> Amp alternator will generate 80+ amps at engine idle.
>
> When I replaced the alternator I also replaced my belts with two Gates
> XL-7570 (3/8" x 57-5/8") for the alternator & PS pump and one Gates XL-7619
> (3/8" x 62-1/2") belt for the A/C compressor.
>
> I only have about 3K miles on the 100 amp alternator with a dual pulley but
> so far so good. Even with the alternator putting out a full 100Amps my belts
> stay put and make no noise.
>
> I would suggest replacing all of your belts with new ones. My experience is
> that when you mix old and new belts, the old and new belts will be slightly
> different sizes. That causes the older belts to ride deeper in the shiv and
> the new belts to ride higher on the shiv. Thus the new and old belts fight
> each other. Since two of my belts share all pulleys, and three belts share
> pulleys at both the crank and the water pump, I replaced all of my belts
> with new ones. Dave
>
> I fitted a dual pulley on Double Trouble and that was the end of my
> generator belt problems. To make sure I got the max contact with the power
> steering pump I pushed it away from the block as far as its adjustment would
> allow; no problems with that either.
>
> It has been recommended that you get two belts from the same batch so that
> they will be the same length and that is a good idea. I did not do that, I
> fitted one new belt and left the old belt. The new belt stretched out to the
> length of the old belt fairly quickly and then they stayed the same. That
> was about 5000 miles ago!
>
> Regards,
> Rob Mueller
> Sydney, Australia
> AUS '75 Avion-The Blue Streak TZE365V100428
> USA '75 Avion-Double Trouble TZE365V100426
>
>
>
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
>
>
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
|
|
|
|
| Re: [GMCnet] Dual alternator belt pulley [message #64716 is a reply to message #64396] |
Wed, 18 November 2009 00:45 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
|
Senior Member |
|
|
I replaced my alternator pulley about 5 years ago with a double one for the same source in ND that Rob used. (Jim K allso stocks them.) I also replaced all three of the belts with true 7/16" (11 mm.) belts from Kelly - Springfield (available from AutoZone). The pair on the alternator are a matched set from the same batch. I have had not had any problems since then. I did re-adjust the belt tension after a few thousand miles.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
|
|
|
|
|
|
| Re: [GMCnet] Dual alternator belt pulley [message #64736 is a reply to message #64376] |
Wed, 18 November 2009 08:08 |
fred v
Messages: 999
Registered: April 2006
Location: pensacola, fl.
Karma: 0
|
Senior Member |
|
|
i put in the double pulley about 2 or 3 years ago. i adjusted the belts soon after and have not touched it since and have never heard a squeal from it. i too get a little groan from the PS pump at low RPM but i think i had that before.
Fred V
'77 Royale RB 455
P'cola, Fl
|
|
|
|
| Re: [GMCnet] Dual alternator belt pulley [message #64756 is a reply to message #64736] |
Wed, 18 November 2009 10:44 |
Gary Casey
Messages: 448
Registered: September 2009
Karma: 0
|
Senior Member |
|
|
Maybe my setup is unusual, or maybe it has changed sometime in the last 35 years. I have a '73 23 without air conditioning. The Power steering is on the left and the alternator is on the right. The crank has 3 sheaves - rear is alternator and water pump, middle is power steering and water pump and the front is empty. The power steering pump has two sheaves, the one at the rear not used and it is driven by the front only. The Water pump has 3 sheaves - the front is not used. The alternator has only one. So if I get a 2-sheave pulley for the alternator, how do I hook it up? I could use the rear two for the power steering and alternator (they'll miss the water pump pulley) and then a single belt to the water pump only on the front sheave - but then I have to do the race car trick of getting a belt exactly the right size. Not fun. I could use one belt to run the water pump and alternator and another to run the power steering and alternator. I
would then have to adjust the alternator to tension one belt and the power steering pump to adjust the other, after the alternator is adjusted. Still non-standard and the belt would have a very long span from the power steering on one side to the alternator on the other. I guess I could move the alternator or the power steering, but I'm trying to avoid that. I would certainly like to have two belts on the alternator, but I'm a bit mystified at the moment.
Gary
________________________________
From: fred veenschoten <fredntoni@cox.net>
To: gmclist@temp.gmcnet.org
Sent: Wed, November 18, 2009 7:08:09 AM
Subject: Re: [GMCnet] Dual alternator belt pulley
i put in the double pulley about 2 or 3 years ago. i adjusted the belts soon after and have not touched it since and have never heard a squeal from it. i too get a little groan from the PS pump at low RPM but i think i had that before.
--
Fred V
'77 Royale RB 455
P'cola, Fl
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
|
|
|
|
| Re: [GMCnet] Dual alternator belt pulley [message #64769 is a reply to message #64756] |
Wed, 18 November 2009 12:49 |
fred v
Messages: 999
Registered: April 2006
Location: pensacola, fl.
Karma: 0
|
Senior Member |
|
|
| Gary Casey wrote on Wed, 18 November 2009 10:44 |
Maybe my setup is unusual, or maybe it has changed sometime in the last 35 years. I have a '73 23 without air conditioning. The Power steering is on the left and the alternator is on the right. The crank has 3 sheaves - rear is alternator and water pump, middle is power steering and water pump and the front is empty. The power steering pump has two sheaves, the one at the rear not used and it is driven by the front only. The Water pump has 3 sheaves - the front is not used. The alternator has only one. So if I get a 2-sheave pulley for the alternator, how do I hook it up? I could use the rear two for the power steering and alternator (they'll miss the water pump pulley) and then a single belt to the water pump only on the front sheave - but then I have to do the race car trick of getting a belt exactly the right size. Not fun. I could use one belt to run the water pump and alternator and another to run the power steering and alternator. I
would then have to adjust the alternator to tension one belt and the power steering pump to adjust the other, after the alternator is adjusted. Still non-standard and the belt would have a very long span from the power steering on one side to the alternator on the other. I guess I could move the alternator or the power steering, but I'm trying to avoid that. I would certainly like to have two belts on the alternator, but I'm a bit mystified at the moment.
Gary
|
yes, you have an odd setup. could be original for a '73, i don't know. all that i've seen have PD and alt. on left; AC on right and 3 belts. the alt belt goes around the alt., PS, water pump and down to the crank. the PS belt goes around the PS, water pump and down to the crank.
when you use 2 sheave pulley on the alt. you eliminate the PS belt as now 2 alt. belts contact the PS pump pulley. the PS pump is locked in place and never moves again. the alt. tightens both of its belts to drive the alt., PS and water pump.
if you could move the alt. to the left side you would be in business. are you sure you have the correct belt on the alt.? if it is too narrow this can cause slippage.
Go to AutoZone. They sell the correct width belts under the Kelly Springfield, Duralast, and Goodyear brands.
Goodyear owns the Kelly Springfield brand and Kelly Springfield makes the Duralast belts for AutoZone.
you want an 11mm or 7/16" wide belt. Take a 10 mm open end wrench and try to put it over the belt.? If it goes over
the belt, you have the wrong one.
Fred V
'77 Royale RB 455
P'cola, Fl
|
|
|
|
| Re: [GMCnet] Dual alternator belt pulley [message #64771 is a reply to message #64724] |
Wed, 18 November 2009 13:10 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
|
Senior Member |
|
|
| Robert Mueller wrote on Wed, 18 November 2009 06:03 |
Ken,
I went to Gene's website and here's what he has listed vis-à-vis the Kelly
belts.
455
P/S (3/8� x 42�) = 15450
P/S (7/16� x 42) = Blank
AC (7/16� x 62�) = Blank
AC = 15220
Alternator = 15573
What numbers do you have?
Regards,
Rob Mueller
Sydney, Australia
AUS '75 Avion-The Blue Streak TZE365V100428
USA '75 Avion-Double Trouble TZE365V100426
|
Boy are those number screwed up. I can tell some are wrong.
First a true 15xxx is a 7/16" belt not a 3/8 belt so the first number is wrong. Note: Gates and NAPA (made by Gates) now substitute the 3/8" belt for a true 7/16" belt so in the of Gates and NAPA only.
Second the last three digit of the number is the length.
The shortest belt is the PS. The medium size one is the Alternator and the longest one is the AC. That is not what you have listed. I do not have the correct numbers right now. They are on my hard drive. I will not be able to look at my files until I get my laptop fixed. If someone does not post the correct numbers, I'll do it when I fix my machine.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
|
|
|
|
|
|
| Re: [GMCnet] Dual alternator belt pulley [message #64777 is a reply to message #64771] |
Wed, 18 November 2009 13:42 |
dmumert
Messages: 46
Registered: December 2006
Location: Canada
Karma: 0
|
Member |
|
|
Hi Ken
Here is a copy of what you posted some time ago.
Take a 10 mm open end wrench and try to put it over the belt.
If it goes over the belt, you have the wrong one.
K-S, Goodyear, Duralast part numbers follow:
Power steering part number 15450
Alternator part number 15573
A/C on 455 part number 15620
A/C on 403 part number 15585
Dave
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Ken Burton
Sent: Wednesday, November 18, 2009 12:11 PM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Dual alternator belt pulley
Robert Mueller wrote on Wed, 18 November 2009 06:03
> Ken,
>
> I went to Gene's website and here's what he has listed vis-à-vis the Kelly
> belts.
>
> 455
> P/S (3/8� x 42�) = 15450
> P/S (7/16� x 42) = Blank
> AC (7/16� x 62�) = Blank
> AC = 15220
> Alternator = 15573
>
> What numbers do you have?
>
> Regards,
> Rob Mueller
> Sydney, Australia
> AUS '75 Avion-The Blue Streak TZE365V100428
> USA '75 Avion-Double Trouble TZE365V100426
Boy are those number screwed up. I can tell some are wrong.
First a true 15xxx is a 7/16" belt not a 3/8 belt so the first number is
wrong. Note: Gates and NAPA (made by Gates) now substitute the 3/8" belt
for a true 7/16" belt so in the of Gates and NAPA only.
Second the last three digit of the number is the length.
The shortest belt is the PS. The medium size one is the Alternator and the
longest one is the AC. That is not what you have listed. I do not have
the correct numbers right now. They are on my hard drive. I will not be
able to look at my files until I get my laptop fixed. If someone does not
post the correct numbers, I'll do it when I fix my machine.
--
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Dave Mumert
Olds, AB
|
|
|
|
| Re: [GMCnet] Dual alternator belt pulley [message #64779 is a reply to message #64777] |
Wed, 18 November 2009 13:54 |
|
USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
|
Senior Member |
|
|
Jim / Dave / Ken,
Thanks for posting this info.
I have one more question regarding the size; the belts have been described
as 7/16 in wide and that one should take a 10mm wrench to verify that
however:
7/16 in = 0.4375 in
10 mm = 0.3936996 in
11 mm = 0.4330696 in
Why not use a 11 mm wrench?
Is it because distance across the flats of a 10 mm wrench is actually larger
for clearance (he asks; sitting in front of the computer and not at the
workshop so I can't measure one).
Regards,
Rob Mueller
Sydney, Australia
AUS '75 Avion-The Blue Streak TZE365V100428
USA '75 Avion-Double Trouble TZE365V100426
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Dave Mumert
Sent: Thursday, 19 November 2009 6:43 AM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Dual alternator belt pulley
Hi Ken
Here is a copy of what you posted some time ago.
Take a 10 mm open end wrench and try to put it over the belt.
If it goes over the belt, you have the wrong one.
K-S, Goodyear, Duralast part numbers follow:
Power steering part number 15450
Alternator part number 15573
A/C on 455 part number 15620
A/C on 403 part number 15585
Dave
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Ken Burton
Sent: Wednesday, November 18, 2009 12:11 PM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Dual alternator belt pulley
Robert Mueller wrote on Wed, 18 November 2009 06:03
> Ken,
>
> I went to Gene's website and here's what he has listed vis-à-vis the Kelly
> belts.
>
> 455
> P/S (3/8� x 42�) = 15450
> P/S (7/16� x 42) = Blank
> AC (7/16� x 62�) = Blank
> AC = 15220
> Alternator = 15573
>
> What numbers do you have?
>
> Regards,
> Rob Mueller
> Sydney, Australia
> AUS '75 Avion-The Blue Streak TZE365V100428
> USA '75 Avion-Double Trouble TZE365V100426
Boy are those number screwed up. I can tell some are wrong.
First a true 15xxx is a 7/16" belt not a 3/8 belt so the first number is
wrong. Note: Gates and NAPA (made by Gates) now substitute the 3/8" belt
for a true 7/16" belt so in the of Gates and NAPA only.
Second the last three digit of the number is the length.
The shortest belt is the PS. The medium size one is the Alternator and the
longest one is the AC. That is not what you have listed. I do not have
the correct numbers right now. They are on my hard drive. I will not be
able to look at my files until I get my laptop fixed. If someone does not
post the correct numbers, I'll do it when I fix my machine.
--
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
|
|
|
|
|
|
| Re: [GMCnet] Dual alternator belt pulley [message #64796 is a reply to message #64780] |
Wed, 18 November 2009 14:54 |
|
USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
|
Senior Member |
|
|
Gene,
Ken noted; "I also replaced all three of the belts with true 7/16" (11 mm.)
belts from Kelly - Springfield (available from AutoZone)."
I was trying to point out that the 7/16" x 42" and 7/16" x 62 blocks under
Kelly were blank in the chart.
Regards,
Rob Mueller
Sydney, Australia
AUS '75 Avion-The Blue Streak TZE365V100428
USA '75 Avion-Double Trouble TZE365V100426
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Mr.erf ERFisher
Sent: Thursday, 19 November 2009 7:05 AM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Dual alternator belt pulley
you should go read it yourself, before you say this
http://users.sfo.com/~eagle/BELTS
you are not getting all of the info
gene
--
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
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
|
|
|
|
|
|
| Re: [GMCnet] Dual alternator belt pulley [message #64804 is a reply to message #64776] |
Wed, 18 November 2009 15:56 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
|
Senior Member |
|
|
| Jim White[1 |
wrote on Wed, 18 November 2009 13:35]Gents-
Here's what I used- came from a post by Emery many moons ago.
K-S, Goodyear, Duralast part numbers follow:
Ato Zone has them as Duralast-
Power steering part number 15450
Alternator part number 15573
A/C on 455 part number 15620
A/C on 403 part number 15585
My 10mm open end wrench would not go ever them.
HTH-
Jim "Doc" White
Wintergreen, VA
*****************
|
Thanks Doc. Now I don't have to go find them.
Ken
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
|
|
|
|
| Re: [GMCnet] Dual alternator belt pulley [message #64826 is a reply to message #64798] |
Wed, 18 November 2009 19:09 |
|
USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
|
Senior Member |
|
|
Matt,
THANKS!
And that's THAT!
Guess I'll have to add a vernier to the tape measure I carry!
Regards,
Rob Mueller
Sydney, Australia
AUS '75 Avion-The Blue Streak TZE365V100428
USA '75 Avion-Double Trouble TZE365V100426
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Matt Colie
Sent: Thursday, 19 November 2009 8:01 AM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Dual alternator belt pulley
Good Question Rob,
Because 10mm makes a great go-nogo gage for this test.
Often the manufacturer will get a little carried away when de-flashing the
belts. I have found a number of really truly 7/16 belts to measure at
0.427~0.422 (yes, I carry a vernier caliper everywhere).
Matt
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
|
|
|
|
| Re: [GMCnet] Dual alternator belt pulley [message #64838 is a reply to message #64756] |
Wed, 18 November 2009 20:15 |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
|
Senior Member |
|
|
""Maybe my setup is unusual, or maybe it has changed sometime in the last 35 years. I have a '73 23 without air conditioning. The Power steering is on the left and the alternator is on the right. The crank has 3 sheaves - rear is alternator and water pump, middle is power steering and water pump and the front is empty. The power steering pump has two sheaves, the one at the rear not used and it is driven by the front only. The Water pump has 3 sheaves - the front is not used. The alternator has only one. So if I get a 2-sheave pulley for the alternator, how do I hook it up? I could use the rear two for the power steering and alternator (they'll miss the water pump pulley) and then a single belt to the water pump only on the front sheave - but then I have to do the race car trick of getting a belt exactly the right size. Not fun. I could use one belt to run the water pump and alternator and another to run the power steering and alternator. ""
Is there any way you could post some pics of the top of your engine? There probably aren't many original non-A/C coaches around. If I remember, Hardy johnson had an original non A/C coach.
Bob de Kruyff
78 Eleganza
Chandler, AZ
|
|
|
|
| Re: [GMCnet] Dual alternator belt pulley [message #64840 is a reply to message #64386] |
Wed, 18 November 2009 20:23 |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
|
Senior Member |
|
|
Many times, belt squeeling can be caused by worn pulleys. The original sheet metal ones are notorious for slipping because they literally wear out. Then people replace them with new dual versions and the problem is gone. I'm running a single machined pulley with a 100 amp alternator and have had no squeeling problems. Don't get me wrong, the dual pulley is probably a good thing, but there's also a good possibility that any new pulley is a good thing. I always go back to the original design and wonder if we are fixing a design problem or simply a worn out problem. The original drive system passed many years of good performance. I understand that even the machined pulleys will eventually wear out.
Bob de Kruyff
78 Eleganza
Chandler, AZ
|
|
|
|
Goto Forum:
Current Time: Sat Oct 26 19:37:10 CDT 2024
Total time taken to generate the page: 0.01344 seconds
|
GMCforum
Search
Help
Register
Login
Home
