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Old 02-25-2016, 02:48 PM   #1
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1983 31' Airstream310
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Air ride parts please help

I have a 1987 290 Motorhome that is currently in the shop having the rear air bags replaced. They were loosing about 5lbs per day and the leak was impossible to find so I decided to replace the system. I'm going with a new Firestone system but the mechanics are having a hard time finding the following parts. I appreciate the help in advance! Below is what I am looking for. I've already called Inland RV with no success and Airstream supply is looking into it but said it was a going to require some hunting.

1. 12 .250 compression fittings.
2. 8 feet of 3/8 airline with 4 compression fittings.

If anyone needs more details I can make a call to find out.
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Old 02-25-2016, 09:33 PM   #2
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These guys will have whatever you need. http://www.sdtrucksprings.com/
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Old 02-25-2016, 10:38 PM   #3
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You might try these guys. I have used them for Street Rod stuff.

https://www.airliftcompany.com/shop/.../air-fittings/
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Old 02-27-2016, 08:28 AM   #4
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I don't guess I understand what you're talking about. My airbags only inflate when the engine is running. As soon as I turn off the ignition they bleed down. Isn't that normal?
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Old 02-27-2016, 10:05 AM   #5
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If they bleed down immediately after you turn the rig off youve got a pretty good leak in your system. They should hold air for a few days at least, sometimes lots more. It just means your compressor will be working a lot harder to keep them inflated and that could wear your compressor out prematurely. It also means you are drawing the amperage to run the compressor. (On a marginal electrical system).
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Old 02-27-2016, 06:53 PM   #6
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I put Firestone air bags on my Ram 2500 several months ago & bought the extra fittings & hose from Amazon.
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Old 02-27-2016, 08:24 PM   #7
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Quote:
Originally Posted by coairstream View Post
I have a 1987 290 Motorhome that is currently in the shop having the rear air bags replaced. They were loosing about 5lbs per day and the leak was impossible to find so I decided to replace the system. I'm going with a new Firestone system but the mechanics are having a hard time finding the following parts. I appreciate the help in advance! Below is what I am looking for. I've already called Inland RV with no success and Airstream supply is looking into it but said it was a going to require some hunting.

1. 12 .250 compression fittings.
2. 8 feet of 3/8 airline with 4 compression fittings.

If anyone needs more details I can make a call to find out.
DON'T DO IT!!!
The air ride system that is in the Airstream (I have a 86 325) is different than the static airbags like the Firestone or AirLift systems.

The ones in the Airstream are designed to adjust as you ride, keeping bouncing to a minimum and to keep your drive axle against the road. The others are for ride height and re balancing after adding to a load...
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Old 02-29-2016, 08:36 AM   #8
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Mayco are you sure about that? I think mine are behaving as they should, but I can see where it would make the compressor work more. I don't think mine actually leak down. When I get where I'm going and turn off the engine, as soon as I turn the ignition key off a valve back by the compressor opens and intentionally releases the pressure off the bags....
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Old 02-29-2016, 09:34 AM   #9
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Maybe its a different than my system on the '82 310, could be on a newer 345 as yours. Or maybe the tag axle makes a difference. I should have qualified my statement to refer to the 310. I know that on the 310s, without a tag, pressure is maintained in the rear bags when the ignition is turned off. Depending on how tight your system is, it will maintain pressure for quite a while. Days if not weeks. May be a different leveling valve(s) on the 345. Someone with a 345 will chime in. I believe Airstream used 2 leveling valves on the tag axle on the 345s, Ive never heard of them dumping air when the ignition is turned off. If your system is stock it should be an American Carrier system. There are numerous threads on the forums about the rear air bags, you might want to do a search on the system. I believe the owners manual has a good description of the system also. the only valve near the compressor that Im aware of is the check valve for the system. It is supposed to prevent air from leaking back from your tank through the compressor. These check valves do go bad and can leak. Inexpensive part to replace. You may want to look at that "valve" you refer to and see if its your check valve leaking. You should have a schrader valve on your air storage tank, you can put a tire gauge on it to check pressure in the tank. You should have pressure in your tank regardless if the ignition is on or off, unless the rig has sat so long that it has all leaked out. If your tank isnt holding pressure while your rig is turned off I would say you definitely have a leak.
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Old 02-29-2016, 10:04 AM   #10
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Quote:
Originally Posted by coairstream View Post
I have a 1987 290 Motorhome that is currently in the shop having the rear air bags replaced. They were loosing about 5lbs per day and the leak was impossible to find so I decided to replace the system. I'm going with a new Firestone system but the mechanics are having a hard time finding the following parts. I appreciate the help in advance! Below is what I am looking for. I've already called Inland RV with no success and Airstream supply is looking into it but said it was a going to require some hunting.

1. 12 .250 compression fittings.
2. 8 feet of 3/8 airline with 4 compression fittings.

If anyone needs more details I can make a call to find out.
Compression fittings should NEVER EVER be used for air under pressure.

In a short time, they will leak.

Andy
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Old 02-29-2016, 03:47 PM   #11
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Mike

I have always wondered if rigs that have factory levellers bleed off excess air to allow the coach to sit on the frame, then you level out the coach with the levellers and have a stable, not bouncy platform as we do. That's how I'd want it, but would hate the long run time to reinflate the bags to full capacity. Maybe the system just bleeds down to just deflate and not completely evacuate the system.

You are right about the system holding air for quite awhile as mine now holds the rig up for over a month at a time.

Cheers
Tony

@ the OP. Any heavy truck place worth their salt will have all that you need for airline and fittings.
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Old 02-29-2016, 05:45 PM   #12
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Ive just never heard or seen of a system like that on one of our Classics. My 310 is a bit bouncy depending on the level of activity..........I MEAN WALKING AROUND AND SUCH IN THE CABIN!!! I would think that one would be able to hear where the system was bleeding air from when he shuts the rig down. After I replaced the compressor and tightened up my system Ive payed attention to the bleed down and it holds pretty good for 4+ days. After installing the VAIR compressor and getting rid of a few minor leaks, it takes about 4-5 minutes to fill my system. (Starting from 0psi)
The system you descibed would be a good idea, as long as it wasnt totally emptying the tank.
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Old 02-29-2016, 06:15 PM   #13
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I think you have multiple problems....even if the check valve were bad the air bags would not bleed down, that is controlled by the leveling valve itself. I also agree with Andy....compression fittings in my opinion are junk...COB at best, do it the right way. All the parts you need are available at any NAPA store.
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Old 03-01-2016, 08:00 PM   #14
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Maybe I missed it in this thread. If compression fittings are not recommended for air lines, what type of fittings are?


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