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| Correct AC compressor [message #320056] |
Thu, 06 July 2017 10:57  |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
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Hi guys--I haven't posted for a long time due to being super busy and playing with other projects. However, I've been enjoying my 78 GMC and conducted a fair amount of maintenance on it recently. Over the 4th weekend, I took the coach to one of our reservoirs (lake Roosevelt) for some overdue camping. The trip went fine until I got stuck in the sand at the camping spot. While trying to get pulled out, my ignition switch crapped out and I couldn't move it to the start position. I had to force it with a pair of pliers and was able to start it. Then my AC compressor started making a terrible rattling. Since all of this was happening while I had 2 trucks trying to pull me out of the sand, my only thought was to keep it running and get to a spot where I could camp. It looks like the AC clutch is coming apart and until I get the compressor out I can't really see what has happened. I had to cut the belt to stop the rattling and severe vibration even with the AC turned off. The hub of the compressor turns easily by hand. I can replace the clutch but frankly that compressor is probably at least 30 years old so I plan on replacing the whole thing. I want to stick with a DA6 but I'm wondering what P/N. I assumed it is the same as a 1978 Toronado, but the Interchange manual has different part numbers that do not cross to the Toronado. I crossed the original 1131953 number and came up with yet another reference that doesn't match any of the others.
Does anyone have a clue what the difference may be between the GMC and Toronado? The pulley diameters all seem to be the same so maybe it is a difference in pulley offset or hose manifold configuration.
Bob de Kruyff
78 Eleganza
Chandler, AZ
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| Re: [GMCnet] Correct AC compressor [message #320061 is a reply to message #320056] |
Thu, 06 July 2017 13:41  |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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The pulley diameter.
Toros are smaller.
We have not had great luck with the rebuilds and they all tell us that it
is because they cannot get new critical parts.
We have been using the Sanden conversion with 100% result in last 3 years.
On Thu, Jul 6, 2017 at 8:57 AM, Bob de Kruyff wrote:
> Hi guys--I haven't posted for a long time due to being super busy and
> playing with other projects. However, I've been enjoying my 78 GMC and
> conducted
> a fair amount of maintenance on it recently. Over the 4th weekend, I took
> the coach to one of our reservoirs (lake Roosevelt) for some overdue
> camping. The trip went fine until I got stuck in the sand at the camping
> spot. While trying to get pulled out, my ignition switch crapped out and I
> couldn't move it to the start position. I had to force it with a pair of
> pliers and was able to start it. Then my AC compressor started making a
> terrible rattling. Since all of this was happening while I had 2 trucks
> trying to pull me out of the sand, my only thought was to keep it running
> and
> get to a spot where I could camp. It looks like the AC clutch is coming
> apart and until I get the compressor out I can't really see what has
> happened.
> I had to cut the belt to stop the rattling and severe vibration even with
> the AC turned off. The hub of the compressor turns easily by hand. I can
> replace the clutch but frankly that compressor is probably at least 30
> years old so I plan on replacing the whole thing. I want to stick with a DA6
> but I'm wondering what P/N. I assumed it is the same as a 1978 Toronado,
> but the Interchange manual has different part numbers that do not cross to
> the Toronado. I crossed the original 1131953 number and came up with yet
> another reference that doesn't match any of the others.
> Does anyone have a clue what the difference may be between the GMC and
> Toronado? The pulley diameters all seem to be the same so maybe it is a
> difference in pulley offset or hose manifold configuration.
> --
> Bob de Kruyff
> 78 Eleganza
> Chandler, AZ
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
Jim Kanomata
Applied/GMC, Newark,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] Correct AC compressor [message #320062 is a reply to message #320061] |
Thu, 06 July 2017 15:04 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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I have a Toro pulley on mine. I got the whole used compressor for free and only needed the clutch. So I replaced the clutch, pulley, and bearing on mine with the used Toro one. Jim is correct the Toro pulley is slightly smaller.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] Correct AC compressor [message #320064 is a reply to message #320062] |
Thu, 06 July 2017 15:26 |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
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Senior Member |
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Thanks for the info guys. I'm amazed at how many different part numbers there are for what appear to be the same compressors. It looks like the smaller pulley is most common across most of them. A smaller pulley will spin it a bit faster which may be just fine given that we don't rev our engines that high. It makes me wonder why the GMC had a larger pulley.
Bob de Kruyff
78 Eleganza
Chandler, AZ
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| Re: [GMCnet] Correct AC compressor [message #320066 is a reply to message #320062] |
Thu, 06 July 2017 17:26 |
rjw
Messages: 697
Registered: September 2005
Karma: 4
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Senior Member |
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Ken Burton wrote on Thu, 06 July 2017 16:04I have a Toro pulley on mine. I got the whole used compressor for free and only needed the clutch. So I replaced the clutch, pulley, and bearing on mine with the used Toro one. Jim is correct the Toro pulley is slightly smaller.
Which must be the reason years ago, that I had to get a different belt when I replaced my A/C clutch (that had a pulley already attached).
Richard
76 Palm Beach
SE Michigan
www.PalmBeachGMC.com
Roller Cam 455, TBI+EBL, 3.42 FD, 4 Bag, Macerator, Lenzi (brakes, vacuum system, front end stuff), Manny Tranny, vacuum step, Tankless + OEM water heaters.
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| Re: [GMCnet] Correct AC compressor [message #320069 is a reply to message #320064] |
Thu, 06 July 2017 18:03 |
Bruce Hart
Messages: 1501
Registered: October 2011
Location: La Grange, Wyoming
Karma: 5
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Senior Member |
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Did the 78's come with a different compressor, I thought that the A6 was
the compressor for years even through the 80's.
I ordered through NAPA 10 days ago a clutch assembly for an A6 for my
brothers 69 Cutless.
Napa # 261250
On Thu, Jul 6, 2017 at 2:26 PM, Bob de Kruyff wrote:
> Thanks for the info guys. I'm amazed at how many different part numbers
> there are for what appear to be the same compressors. It looks like the
> smaller pulley is most common across most of them. A smaller pulley will
> spin it a bit faster which may be just fine given that we don't rev our
> engines that high. It makes me wonder why the GMC had a larger pulley.
> --
> Bob de Kruyff
> 78 Eleganza
> Chandler, AZ
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
Bruce Hart
1976 Palm Beach
Milliken, Co
GMC=Got More Class
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Bruce Hart
1976 Palm Beach
1977 28' Kingsley
La Grange, Wyoming
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| Re: [GMCnet] Correct AC compressor [message #320074 is a reply to message #320069] |
Thu, 06 July 2017 20:51 |
powerjon
Messages: 2446
Registered: January 2004
Karma: 5
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Senior Member |
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Bruce,
The Harrison A6 AC compressor was used by GM and other manufactures for a lone time including the late 60’s thru the 80’s.
It is the only one that was used by GM in the GMC coach.
JR Wright
GMC Great Laker MHC
GMC Eastern States Charter Member
GMCGL Tech Editor
GMCMI
78 GMC Buskirk 30’ Stretch
1975 GMC Avion (Under Reconstruction)
Michigan
> On Jul 6, 2017, at 7:03 PM, Bruce Hart wrote:
>
> Did the 78's come with a different compressor, I thought that the A6 was
> the compressor for years even through the 80's.
> I ordered through NAPA 10 days ago a clutch assembly for an A6 for my
> brothers 69 Cutless.
> Napa # 261250
>
> On Thu, Jul 6, 2017 at 2:26 PM, Bob de Kruyff wrote:
>
>> Thanks for the info guys. I'm amazed at how many different part numbers
>> there are for what appear to be the same compressors. It looks like the
>> smaller pulley is most common across most of them. A smaller pulley will
>> spin it a bit faster which may be just fine given that we don't rev our
>> engines that high. It makes me wonder why the GMC had a larger pulley.
>> --
>> Bob de Kruyff
>> 78 Eleganza
>> Chandler, AZ
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>
>
>
>
> --
> Bruce Hart
> 1976 Palm Beach
> Milliken, Co
> GMC=Got More Class
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
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J.R. Wright
GMC GreatLaker
GMC Eastern States
GMCMI
78 30' Buskirk Stretch
75 Avion Under Reconstruction
Michigan
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| Re: [GMCnet] Correct AC compressor [message #320075 is a reply to message #320061] |
Thu, 06 July 2017 20:55 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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It has the capacity to cool a 2 bedroom house. No problem running
additional cooling units in our coaches. Durable, simple. Harrison did a
great job on that one.
Jim Hupy
On Jul 6, 2017 6:52 PM, "John Wright" wrote:
> Bruce,
> The Harrison A6 AC compressor was used by GM and other manufactures for a
> lone time including the late 60’s thru the 80’s.
>
> It is the only one that was used by GM in the GMC coach.
>
> JR Wright
> GMC Great Laker MHC
> GMC Eastern States Charter Member
> GMCGL Tech Editor
> GMCMI
> 78 GMC Buskirk 30’ Stretch
> 1975 GMC Avion (Under Reconstruction)
> Michigan
>
>
>> On Jul 6, 2017, at 7:03 PM, Bruce Hart wrote:
>>
>> Did the 78's come with a different compressor, I thought that the A6 was
>> the compressor for years even through the 80's.
>> I ordered through NAPA 10 days ago a clutch assembly for an A6 for my
>> brothers 69 Cutless.
>> Napa # 261250
>>
>> On Thu, Jul 6, 2017 at 2:26 PM, Bob de Kruyff
> wrote:
>>
>>> Thanks for the info guys. I'm amazed at how many different part numbers
>>> there are for what appear to be the same compressors. It looks like the
>>> smaller pulley is most common across most of them. A smaller pulley will
>>> spin it a bit faster which may be just fine given that we don't rev our
>>> engines that high. It makes me wonder why the GMC had a larger pulley.
>>> --
>>> Bob de Kruyff
>>> 78 Eleganza
>>> Chandler, AZ
>>>
>>> _______________________________________________
>>> GMCnet mailing list
>>> Unsubscribe or Change List Options:
>>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>>
>>
>>
>>
>> --
>> Bruce Hart
>> 1976 Palm Beach
>> Milliken, Co
>> GMC=Got More Class
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
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| Re: [GMCnet] Correct AC compressor [message #320078 is a reply to message #320075] |
Thu, 06 July 2017 21:43 |
Bruce Hart
Messages: 1501
Registered: October 2011
Location: La Grange, Wyoming
Karma: 5
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Senior Member |
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John,
Bob stated that he had a DA6 which is also a production run compressor.
Looks to be a little bit more compact than an A6.
On Thu, Jul 6, 2017 at 7:55 PM, James Hupy wrote:
> It has the capacity to cool a 2 bedroom house. No problem running
> additional cooling units in our coaches. Durable, simple. Harrison did a
> great job on that one.
> Jim Hupy
>
> On Jul 6, 2017 6:52 PM, "John Wright" wrote:
>
>> Bruce,
>> The Harrison A6 AC compressor was used by GM and other manufactures for a
>> lone time including the late 60’s thru the 80’s.
>>
>> It is the only one that was used by GM in the GMC coach.
>>
>> JR Wright
>> GMC Great Laker MHC
>> GMC Eastern States Charter Member
>> GMCGL Tech Editor
>> GMCMI
>> 78 GMC Buskirk 30’ Stretch
>> 1975 GMC Avion (Under Reconstruction)
>> Michigan
>>
>>
>>> On Jul 6, 2017, at 7:03 PM, Bruce Hart wrote:
>>>
>>> Did the 78's come with a different compressor, I thought that the A6
> was
>>> the compressor for years even through the 80's.
>>> I ordered through NAPA 10 days ago a clutch assembly for an A6 for my
>>> brothers 69 Cutless.
>>> Napa # 261250
>>>
>>> On Thu, Jul 6, 2017 at 2:26 PM, Bob de Kruyff
>> wrote:
>>>
>>>> Thanks for the info guys. I'm amazed at how many different part
> numbers
>>>> there are for what appear to be the same compressors. It looks like
> the
>>>> smaller pulley is most common across most of them. A smaller pulley
> will
>>>> spin it a bit faster which may be just fine given that we don't rev
> our
>>>> engines that high. It makes me wonder why the GMC had a larger pulley.
>>>> --
>>>> Bob de Kruyff
>>>> 78 Eleganza
>>>> Chandler, AZ
>>>>
>>>> _______________________________________________
>>>> GMCnet mailing list
>>>> Unsubscribe or Change List Options:
>>>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>>>
>>>
>>>
>>>
>>> --
>>> Bruce Hart
>>> 1976 Palm Beach
>>> Milliken, Co
>>> GMC=Got More Class
>>> _______________________________________________
>>> GMCnet mailing list
>>> Unsubscribe or Change List Options:
>>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
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>
--
Bruce Hart
1976 Palm Beach
Milliken, Co
GMC=Got More Class
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Bruce Hart
1976 Palm Beach
1977 28' Kingsley
La Grange, Wyoming
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| Re: [GMCnet] Correct AC compressor [message #320081 is a reply to message #320080] |
Thu, 06 July 2017 22:40 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Right, Terry. The smaller pulley will rotate faster; and, since energy
consumed is proportional to the square of the velocity (rotational speed),
the compressor will consume more power -- and cool better.
Ken H
.
On Thu, Jul 6, 2017 at 11:31 PM, Terry wrote:
> The larger pulley on the motor home compressor would take less power from
> the engine, leaving more to move the vehicle.
> --
>
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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] Correct AC compressor [message #320082 is a reply to message #320081] |
Fri, 07 July 2017 00:21 |
 |
USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Showoff! ;-)
Regards,
Rob M.
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
USA '77 Kingsley - TZE 267V100808
-----Original Message-----
From: Gmclist [mailto:gmclist-bounces@list.gmcnet.org] On Behalf Of Ken Henderson
Sent: Friday, July 7, 2017 1:40 PM
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] Correct AC compressor
Right, Terry. The smaller pulley will rotate faster; and, since energy
consumed is proportional to the square of the velocity (rotational speed),
the compressor will consume more power -- and cool better.
Ken H
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] Correct AC compressor [message #320090 is a reply to message #320081] |
Fri, 07 July 2017 10:33 |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
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Senior Member |
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The on line descriptions for these compressors usually state the pulley sizes and most of them appear to be about 5 1/4 diameter. I did find one with a stated diameter of 6" . I ordered one with a stated size of 5 1/4 and we'll see what it really is. I'm not sure what's on there now frankly. Regardless, with AZ temperatures well above 110F a little extra cooling capacity won't hurt. I need to stock up on Duracool--is Worthington still the best source?
Bob de Kruyff
78 Eleganza
Chandler, AZ
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| Re: [GMCnet] Correct AC compressor [message #320113 is a reply to message #320090] |
Fri, 07 July 2017 16:18 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Bob,
I posted this info awhile back:
Tiny URL: http://tinyurl.com/nuhwtb4
Full URL:
http://www.frostycool.com/FrostyCool-r12a-refrigerant-replacement-for-r-12-freon-substitutes-18-oz-equivalent-1-case-12x-cans/
I spoke to a sales rep from this company and he advised that FrostyCool is the SAME gas as Duracool.
Here's the math:
Case of 12 cans: $49.95
UPS Ground to TX: $14.90
Total $64.85
I run this stuff in Double Trouble AND my 1995 Jeep Grand Cherokee, works fine.
Regards,
Rob M.
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
USA '77 Kingsley - TZE 267V100808
-----Original Message-----
From: Gmclist [mailto:gmclist-bounces@list.gmcnet.org] On Behalf Of Bob de Kruyff
Sent: Saturday, July 8, 2017 1:34 AM
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] Correct AC compressor
The on line descriptions for these compressors usually state the pulley sizes and most of them appear to be about 5 1/4 diameter. I
did find one with
a stated diameter of 6" . I ordered one with a stated size of 5 1/4 and we'll see what it really is. I'm not sure what's on there
now frankly.
Regardless, with AZ temperatures well above 110F a little extra cooling capacity won't hurt. I need to stock up on Duracool--is
Worthington still the
best source?
--
Bob de Kruyff
78 Eleganza
Chandler, AZ
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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