| [GMCnet] Air ride compressors [message #357358] |
Fri, 31 July 2020 09:01  |
BobDunahugh
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
Karma: 11
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Senior Member |
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I hear of the original compressors being replaced due to lack of volume. Most of the time. It just requires a new cogged timing drive belt. That Jim K at Applied has for $8. On most coaches. That cogged belt can be retimed in place. The original compressor is very simple to rebuild. Jim K also has that kit. If you know what a screw driver is. You can do it. There was an air filter in the original unit. That it's remains needs to be cleaned out. ( That could be your compressor issue.)Then you can install a simple external air filter. Seems to me. That it's simpler/cheaper to simply service what you have. Then to find a way to mount a replacement compressor.
Bob Dunahugh
78 Royale since 2003
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| Re: [GMCnet] Air ride compressors [message #357373 is a reply to message #357367] |
Fri, 31 July 2020 13:52  |
Dave Stragand
Messages: 307
Registered: October 2017
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Bob, what is the process for servicing the compressor head air filters?
> On Jul 31, 2020, at 12:52 PM, Bob Dunahugh via Gmclist wrote:
>
> The GMC that we now have. Has the electronically controlled, 2 compressor system. That GM put in late 78 coaches. One compressor for each side. Very simple. No tank. Just one tube from each compressor. To each bag. Thus just 4 fittings.
> For those that have the electronic system. Both compressors also have air filters in the compressor head. That must be serviced.
> Our other GMC that we had. Had that V twin Dana. compressor. With all those fittings/parts. Put lots of belts on compressors. At GMCMI events.
> Bob Dunahugh
>
> ________________________________
> From: Bob Dunahugh
> Sent: Friday, July 31, 2020 9:01 AM
> To: gmclist@list.gmcnet.org
> Subject: Air ride compressors
>
> I hear of the original compressors being replaced due to lack of volume. Most of the time. It just requires a new cogged timing drive belt. That Jim K at Applied has for $8. On most coaches. That cogged belt can be retimed in place. The original compressor is very simple to rebuild. Jim K also has that kit. If you know what a screw driver is. You can do it. There was an air filter in the original unit. That it's remains needs to be cleaned out. ( That could be your compressor issue.)Then you can install a simple external air filter. Seems to me. That it's simpler/cheaper to simply service what you have. Then to find a way to mount a replacement compressor.
> Bob Dunahugh
> 78 Royale since 2003
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1978 Transmode (403)
Pittsburgh, PA
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| Re: [GMCnet] Air ride compressors [message #357374 is a reply to message #357373] |
Fri, 31 July 2020 14:15 |
powwerjon
Messages: 849
Registered: March 2013
Karma: -2
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Senior Member |
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Do You have the X-7525A if you have the Reproduced Cinnabar manual go too Section 4, page 17,Compressor overhaul. That section covers the Dana and the Brown compressor.
The supplement X-7725 covers the Electro Level II system and compressor. Starts about 4B-2
You can also find these on Bdub’s site and on the GMCMI site.
http://www.bdub.net/factory-manuals.html
J.R. Wright
GMC Great Laker MHC
GMCGL Tech Editor
GMC Eastern States Charter Member
GMCMI
78 GMC Buskirk 29.5’ Stretch
75 GMC Avion (Under Reconstruction)
Michigan
> On Jul 31, 2020, at 2:52 PM, Dave Stragand via Gmclist wrote:
>
> Bob, what is the process for servicing the compressor head air filters?
>
>> On Jul 31, 2020, at 12:52 PM, Bob Dunahugh via Gmclist wrote:
>>
>> The GMC that we now have. Has the electronically controlled, 2 compressor system. That GM put in late 78 coaches. One compressor for each side. Very simple. No tank. Just one tube from each compressor. To each bag. Thus just 4 fittings.
>> For those that have the electronic system. Both compressors also have air filters in the compressor head. That must be serviced.
>> Our other GMC that we had. Had that V twin Dana. compressor. With all those fittings/parts. Put lots of belts on compressors. At GMCMI events.
>> Bob Dunahugh
>>
>> ________________________________
>> From: Bob Dunahugh
>> Sent: Friday, July 31, 2020 9:01 AM
>> To: gmclist@list.gmcnet.org
>> Subject: Air ride compressors
>>
>> I hear of the original compressors being replaced due to lack of volume. Most of the time. It just requires a new cogged timing drive belt. That Jim K at Applied has for $8. On most coaches. That cogged belt can be retimed in place. The original compressor is very simple to rebuild. Jim K also has that kit. If you know what a screw driver is. You can do it. There was an air filter in the original unit. That it's remains needs to be cleaned out. ( That could be your compressor issue.)Then you can install a simple external air filter. Seems to me. That it's simpler/cheaper to simply service what you have. Then to find a way to mount a replacement compressor.
>> Bob Dunahugh
>> 78 Royale since 2003
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
> _______________________________________________
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| Re: [GMCnet] Air ride compressors [message #357375 is a reply to message #357373] |
Fri, 31 July 2020 14:19 |
powwerjon
Messages: 849
Registered: March 2013
Karma: -2
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Senior Member |
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You can find these compressor at the Men’s mall. I harvested a number of them out of Mid 70’s to Mid 80’s Full size Cad’s with the air ride rear suspension. The compressor is typically located under the hood on drivers side near the front. Be sure to take as much of the 1/8” air line that is connected to the compressor. Cheap and I test them when I get them home and almost all are good volume producers. Get the wiring harness too!
JR Wright
> On Jul 31, 2020, at 2:52 PM, Dave Stragand via Gmclist wrote:
>
> Bob, what is the process for servicing the compressor head air filters?
>
>> On Jul 31, 2020, at 12:52 PM, Bob Dunahugh via Gmclist wrote:
>>
>> The GMC that we now have. Has the electronically controlled, 2 compressor system. That GM put in late 78 coaches. One compressor for each side. Very simple. No tank. Just one tube from each compressor. To each bag. Thus just 4 fittings.
>> For those that have the electronic system. Both compressors also have air filters in the compressor head. That must be serviced.
>> Our other GMC that we had. Had that V twin Dana. compressor. With all those fittings/parts. Put lots of belts on compressors. At GMCMI events.
>> Bob Dunahugh
>>
>> ________________________________
>> From: Bob Dunahugh
>> Sent: Friday, July 31, 2020 9:01 AM
>> To: gmclist@list.gmcnet.org
>> Subject: Air ride compressors
>>
>> I hear of the original compressors being replaced due to lack of volume. Most of the time. It just requires a new cogged timing drive belt. That Jim K at Applied has for $8. On most coaches. That cogged belt can be retimed in place. The original compressor is very simple to rebuild. Jim K also has that kit. If you know what a screw driver is. You can do it. There was an air filter in the original unit. That it's remains needs to be cleaned out. ( That could be your compressor issue.)Then you can install a simple external air filter. Seems to me. That it's simpler/cheaper to simply service what you have. Then to find a way to mount a replacement compressor.
>> Bob Dunahugh
>> 78 Royale since 2003
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
> _______________________________________________
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| Re: [GMCnet] Air ride compressors [message #357378 is a reply to message #357367] |
Fri, 31 July 2020 14:36 |
BobDunahugh
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
Karma: 11
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Senior Member |
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To service the air filters ( NOTE: 2 filters) in the early V twin. What is the remains of those filters. Is in the crank case. On the backside. Behind the 2-round white disc. Remove the retaining wire. Then pull the disc out. The remains of the filters. Will be all around in there. Including in the valves. I put together a replacement air filter. I put 2 short pieces of hose over the air intakes. To a Y fitting. Then a very short hose. To a 1/4 inch clear, in line gas filter.
As to the late 78 compressors. The filters are in the heads of each compressor.. A long with the down solenoid air valves. I just made a new filter out of some foam material.
Both compressor types are simple to service. Have any questions. My cell is 319-521-4891 Iowa CDT Bob Dunahugh
________________________________
From: Bob Dunahugh
Sent: Friday, July 31, 2020 11:51 AM
To: gmclist@list.gmcnet.org
Subject: RE: Air ride compressors
The GMC that we now have. Has the electronically controlled, 2 compressor system. That GM put in late 78 coaches. One compressor for each side. Very simple. No tank. Just one tube from each compressor. To each bag. Thus just 4 fittings.
For those that have the electronic system. Both compressors also have air filters in the compressor head. That must be serviced.
Our other GMC that we had. Had that V twin Dana. compressor. With all those fittings/parts. Put lots of belts on compressors. At GMCMI events.
Bob Dunahugh
________________________________
From: Bob Dunahugh
Sent: Friday, July 31, 2020 9:01 AM
To: gmclist@list.gmcnet.org
Subject: Air ride compressors
I hear of the original compressors being replaced due to lack of volume. Most of the time. It just requires a new cogged timing drive belt. That Jim K at Applied has for $8. On most coaches. That cogged belt can be retimed in place. The original compressor is very simple to rebuild. Jim K also has that kit. If you know what a screw driver is. You can do it. There was an air filter in the original unit. That it's remains needs to be cleaned out. ( That could be your compressor issue.)Then you can install a simple external air filter. Seems to me. That it's simpler/cheaper to simply service what you have. Then to find a way to mount a replacement compressor.
Bob Dunahugh
78 Royale since 2003
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