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General Discussion of preventative/corrective maintenance and other technical issues regarding your coach that are not covered in other Mechanic's Corner categories (ex. refrigerators, water heaters, and compressors).

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  #1  
Old 08-13-2018
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kunzelj kunzelj is offline
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Default Air Suspension Dump Valve

I have an air suspension leak on my 88 FC. It's worse on the front than the rear. All 8 bags are new Firestones and the leak occurred before and after the replacement. All three leveling valves are new. I can't hear any air leaking, but the front suspension will typically only stay up for an hour, sometimes less.

I am suspecting the suspension dump valves are leaking slightly. Does anyone know where these are located on the '87-89 FC's?

Thanks!
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Old 08-13-2018
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Does it leak down while driving or when powered off?

D
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  #3  
Old 08-13-2018
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If you can safely get under your bird a bottle of soapy water may help you find them leaking. Also I think there is an air manifold on the left frame rail above the front axle that you can check to see if you have a leak there. I'm not sure where it is on the rear.
Check the air bag fittings again, maybe one was cross threaded, they are brass fittings on a copper line.
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Old 08-13-2018
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Quote:
Originally Posted by kunzelj View Post
I have an air suspension leak on my 88 FC. It's worse on the front than the rear. All 8 bags are new Firestones and the leak occurred before and after the replacement. All three leveling valves are new. I can't hear any air leaking, but the front suspension will typically only stay up for an hour, sometimes less.

I am suspecting the suspension dump valves are leaking slightly. Does anyone know where these are located on the '87-89 FC's?

Thanks!
Look for the valve(s) in the attachment. Recently our front one was leaking...no sound (bad hearing)...but the soapy water produced lots of bubbles. HTH
Attached Files
File Type: pdf Williams Valves - wm-147f-j-p_specification_sheet.pdf (586.5 KB, 84 views)
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  #5  
Old 08-13-2018
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Curt,

I think that's the valve I'm looking for. It just screams air leak by the looks of it. Screws and gaskets and seals. I remember seeing it under by coach. I don't like being under it at the best of times, so I might just change it regardless.

Thanks,

Jeff
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  #6  
Old 08-13-2018
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That's the valve (WM147) Shane had go out in Shipshewana a few years back, his coach would not air up.
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Old 08-13-2018
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It stays up if the engine is running or the aux compressor is on. It doesn't take much air to keep it up, but will leak down rather quickly. I believe an air ride should stay inflated for at least 24 hours. The only other air leak I have is the horton fan which will be replaced this fall.
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  #8  
Old 08-13-2018
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Quote:
Originally Posted by kunzelj View Post
It stays up if the engine is running or the aux compressor is on. It doesn't take much air to keep it up, but will leak down rather quickly. I believe an air ride should stay inflated for at least 24 hours. The only other air leak I have is the horton fan which will be replaced this fall.
that front dump valve is in a difficult place,
I have not changed it, but it is on the passenger side, in a busy area, , it is also difficult to spray with the soapy water, follow lines from the leveling valve.
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  #9  
Old 12-08-2019
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Would this valve also be responsible for NOT dumping when the dump switch is set to dump? I noticed my suspension airing up (steering wheel rotated itself) despite being dumped.
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  #10  
Old 12-08-2019
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Quote:
Originally Posted by pauleburgess View Post
Would this valve also be responsible for NOT dumping when the dump switch is set to dump? I noticed my suspension airing up (steering wheel rotated itself) despite being dumped.

Yes,thats possible,it takes air to make it dump,so if the valve is stuck it would not dump,or if stuck in the dump position (like Shanes was) it will not air up.


Inside theres a diaphragm that uses air to push/pull a shaft down to direct the air,if the diaphragm is bad it will not push/pull the shaft,and theres some little springs inside too,if one of them is bad,same result.

When you change it take it apart and take some pics of the broken part.
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