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Old 08-01-2021, 08:28 PM   #1
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Air Leak Help...Where do I start

Thanks in advance for any help you can lend. This is my first MH, lots of mechanical experience, and trailer owner for years. I recently bought a '94 Country Coach 40' Affinity w/ 97k miles. Has been sitting for 3 years. Starts and runs great including the generator.

When parked the right (passenger) side will drop about 5 inches lower than the driver's side. When running it never quite gets to true level and sits a little low on the right. I'm assuming it's an air leak and not a single bad airbag.

I currently have it up on ramps with both axles raised about 7" and the right side of the chassis blocked to level. I'm ready to get under it and start poking around but thought I would reach out first and see if anyone can keep me from going all Hellen Keller on this one.

thanks, Don
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Old 08-01-2021, 08:42 PM   #2
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Make a solution of dawn dish soap, some glycerin, and water and put it in a spray bottle. Put more dawn in it than you would when you wash dishes.

Start spraying it around the air lines, air bags etc and if it starts bubbling you’ve found your leak.

They sell actual leak detector spray, but the poor mans solution works well too.
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Old 08-01-2021, 08:43 PM   #3
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Here’s a good recipe

https://www.verywellfamily.com/homemade-bubbles-2764571
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Old 08-01-2021, 08:57 PM   #4
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While your looking check the air ride height valves (1 in front, 2 on the rear), as they age they leak internally. Somewhat difficult to soap them enough to find the leak but look closely at discharge tube and stem of control arm. Mine were pretty crusty from the junk they put on the winter roads and leaked pretty bad. Air bags can also leak on the top and bottom where you can't get soap to.

I used to consume a lot of air just driving down the road, compressor cycling constantly. New bags and ride height valves were the cure. Now until the road gets rough or cornering it will hold air without cycling.
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Old 08-02-2021, 11:03 AM   #5
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68shelby,
There is no magic potion to a soap and water spray solution for checking air leaks. It's not rocket science. Just put any dish soap you have, about a cap full into some form of a spray bottle, fill the rest with water and carefully move it around to blend it all up. if you shake it, you'll soon see the results of that, inside the spray bottle, not good. Kind-a like shaking a full Coke can!

Then, since you mentioned your coach drifts down fairly quickly on any particular corner, I might start by spraying down your air bags, all the way around, top to bottom. In most diesel coaches with air brakes and air suspension, there's a few miles of air lines all over the place. And then there's air tanks, valves, intersections and more.

I've had air leaks for years and just couldn't pin point them. Well, finally I got lucky and actually heard one, right after I'd parked the coach in its cave at night, when the surroundings were really quiet. I quickly got out my spray bottle which, is always ready with a soap and water solution and, cruised under the coach and started spraying in the area I might have heard something prior.

All the air joints, valves and more I sprayed, revealed nothing. I then thought, "hmmm, I wonder about the air bags"??? I sprayed my left front one and, as you can see in the video below, WOW, HOUSTON, WE HAVE A PROBLEM!!!!!!!

It ended up that, all of them were leaking to some degree. But, that left front was SERIOUS. I ended up replacing all four air bags myself. Not a job for the old guys like me for sure. But, I managed to get through it. I also found out I had a leaking *Pressure Protection Valve* that's on one of my air tanks. That's easy to replace and cheap too. All the air bags cost me around $880.
Scott

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Old 08-02-2021, 02:04 PM   #6
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Quote:
Originally Posted by 68Shelby View Post
Thanks in advance for any help you can lend. This is my first MH, lots of mechanical experience, and trailer owner for years. I recently bought a '94 Country Coach 40' Affinity w/ 97k miles. Has been sitting for 3 years. Starts and runs great including the generator.



When parked the right (passenger) side will drop about 5 inches lower than the driver's side. When running it never quite gets to true level and sits a little low on the right. I'm assuming it's an air leak and not a single bad airbag.



I currently have it up on ramps with both axles raised about 7" and the right side of the chassis blocked to level. I'm ready to get under it and start poking around but thought I would reach out first and see if anyone can keep me from going all Hellen Keller on this one.



thanks, Don


Check air bags first unless they have been replaced.
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Old 08-03-2021, 09:01 AM   #7
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Glad to hear you have her up on blocks. I did the same, aired it up, got on a creeper and started sliding around under the coach spraying anything with a hose on it, looking for bubbles.
Moisture ejector - there are 3 on my coach and 2 of them went out within a month of each other - I could hear them leaking from standing beside the coach


Ride Height air valves
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