| [GMCnet] For the late 78 owners. Get the air filters out of both your air compressors. [message #321728] |
Sun, 06 August 2017 20:58  |
BobDunahugh
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
Karma: 11
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Your 2, suspension air compressors each have foam air filters built into the compressor head. Due to age. They've become a sticky/flaky material that can cause your solenoid valves to leak air from the air bags. A Q tip, and a vacuum cleaner seems to work to get the very small filter material out. Use a 5/16th nut driver to remove the 7 small bolts. Lift off head. You will see the filter, or the rectangle hole that it did reside in. Haven't found a replacement filter material YET. But will notify when I find a replacement. At this point. No filter is better then what you have now. This late system is very simple. Compressor, start relay, solenoid valve, and an electronic eye. One set for each side. Bob Dunahugh Late 78 Royale
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| Re: [GMCnet] For the late 78 owners. Get the air filters out of both your air compressors. [message #321755 is a reply to message #321728] |
Mon, 07 August 2017 09:15  |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Bob I haven't seen the EL II pumps in person, but are they single piston like what GM used on E cars Riv/Toro/Eldo? These have a barbed inlet tube. The Buick Turbo cars used an AC Delco 218-13 or GM 801528 foam filter on the wastegate solenoid to keep dirt out. It is a square foam about 1" long and 3/8" in the square dimension with a hole to slip over the barbed inlet. They come in boxes of 10. I put one on the pump inlet on my Riv and it fits perfectly. If there was one there originally it was long disintegrated. I have picture but rhey always exceed size restrictions here.
John Lebetski
Woodstock, IL
77 Eleganza II
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| Re: [GMCnet] For the late 78 owners. Get the air filters out of both your air compressors. [message #321772 is a reply to message #321755] |
Mon, 07 August 2017 16:28 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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John,
Parts Book 78Z / Section 14 - Air Suspension / Pages 14 -16 through 14 - 20 have exploded views of both the single and dual cylinder
OEM air pumps.
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 John R. Lebetski
Sent: Tuesday, August 8, 2017 12:15 AM
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] For the late 78 owners. Get the air filters out of both your air compressors.
Bob I haven't seen the EL II pumps in person, but are they single piston like what GM used on E cars Riv/Toro/Eldo? These have a
barbed inlet tube.
The Buick Turbo cars used an AC Delco 218-13 or GM 801528 foam filter on the wastegate solenoid to keep dirt out. It is a square
foam about 1" long
and 3/8" in the square dimension with a hole to slip over the barbed inlet. They come in boxes of 10. I put one on the pump inlet on
my Riv and it
fits perfectly. If there was one there originally it was long disintegrated. I have picture but rhey always exceed size restrictions
here.
--
John Lebetski
Woodstock, IL
77 Eleganza II
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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] For the late 78 owners. Get the air filters out of both your air compressors. [message #321773 is a reply to message #321728] |
Mon, 07 August 2017 16:33 |
BobDunahugh
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
Karma: 11
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John. Could you send that photo to me. Sounds like a better filter then stock. The compressor in the 78 GMC seems to have been installed into GM products to 2006. Maybe even new. And is still available at GM dealer now. It's a single cylinder compressor. One of mine will go to 175 PSI. I'll send you a photo. Bob Dunahugh 78 Royale
________________________________
From: Bob Dunahugh
Sent: Sunday, August 6, 2017 8:58 PM
To: gmclist@list.gmcnet.org
Subject: For the late 78 owners. Get the air filters out of both your air compressors.
Your 2, suspension air compressors each have foam air filters built into the compressor head. Due to age. They've become a sticky/flaky material that can cause your solenoid valves to leak air from the air bags. A Q tip, and a vacuum cleaner seems to work to get the very small filter material out. Use a 5/16th nut driver to remove the 7 small bolts. Lift off head. You will see the filter, or the rectangle hole that it did reside in. Haven't found a replacement filter material YET. But will notify when I find a replacement. At this point. No filter is better then what you have now. This late system is very simple. Compressor, start relay, solenoid valve, and an electronic eye. One set for each side. Bob Dunahugh Late 78 Royale
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| Re: [GMCnet] For the late 78 owners. Get the air filters out of both your air compressors. [message #321799 is a reply to message #321794] |
Tue, 08 August 2017 08:25 |
midlf
Messages: 2212
Registered: July 2007
Location: SE Wisc. (Palmyra)
Karma: 1
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Senior Member |
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Kosier wrote on Mon, 07 August 2017 22:01Steve,
John Clement has a new filter material that eliminates the problem of the
deteriorating foam filters.
Gary Kosier
Good to know. I ran hoses from my compressor to a homemade air filter tucked way up under the hood.
Steve Southworth
1974 Glacier TZE064V100150 (for workin on)
1975 Transmode TZE365V100394 (parts & spares)
Palmyra WI
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