| Air Suspension Leakage [message #256420] |
Thu, 24 July 2014 19:45  |
SThornbg
Messages: 127
Registered: September 2011
Karma: 0
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Senior Member |
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I have a '77 coach with the ElectroLevel 1 system, I think the Dana compressor and the small accumulator tank. With the coach running the compressor cycles every 10 minutes and runs for 10 to 15 seconds. The air bags hold as they should. The only leak I can find is at the short red line that runs from the compressor head to the check valve below the accumulator tank. I have soap bubbles at both ends of that line. As the pressure switch is sensing a pressure drop, does that mean the check valve is leaking? Presumably the air cannot leak back through the compressor, thus I am getting leaks at the line fittings between the compressor and the check valve.
Is the check valve a standard item or a Jim K item? How about the plastic line and its fittings?
Thanks for guidance.
Steve
Steve Thornburg
South Bend, IN
77 exPB 455 "Tinker Toy"
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| Re: Air Suspension Leakage [message #256487 is a reply to message #256420] |
Fri, 25 July 2014 08:49  |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Senior Member |
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SThornbg wrote on Thu, 24 July 2014 20:45I have a '77 coach with the ElectroLevel 1 system, I think the Dana compressor and the small accumulator tank. With the coach running the compressor cycles every 10 minutes and runs for 10 to 15 seconds. The air bags hold as they should. The only leak I can find is at the short red line that runs from the compressor head to the check valve below the accumulator tank. I have soap bubbles at both ends of that line. As the pressure switch is sensing a pressure drop, does that mean the check valve is leaking? Presumably the air cannot leak back through the compressor, thus I am getting leaks at the line fittings between the compressor and the check valve.
Is the check valve a standard item or a Jim K item? How about the plastic line and its fittings?
Thanks for guidance.
Steve
Steve,
I am no expert on ElectroLevel I, but from looking at a diagram I think you have at least two problems.
All the fitting should be tight. If you are getting bubbles anywhere, then things are not tight (sealed, closed or air tight).
Now, if bubbles persist more than a couple of minutes after the pump has stopped then the check valve at the tank is not tight. The check valve at the tank should be tight. It may be that you can disassemble and clean it or you may have to replace it.
The bubbles are both ends of the line means (I am assuming you are testing an assembled line) that those fitting are not tight. If you cannot get them tight by just wrenching on them, then they and the line will need to be replaced.
Lastly, it looks like the bad check valve is leave air pressure on the air pump check valves. This is never good. Those valves are never tight. Even when a pump is nearly new, they should not be counted on the be tight. That is why GMC put the check valve at the tank in the first place.
Of course JimK will have everything you need.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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