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M380 (Unique Issues) If you have a unique issue with your M380 model coach and it can't be answered in one of the other forums here, then this is where you can list it.....list your M380 Parts here too.

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  #1  
Old 09-14-2018
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Default M380 air manifold leaks

I've got a long thread on my 120vac compressor problem, which led to me finding a leak in the air manifold in the third bay, left (drivers side). I'm going to open a new thread to make it easier for others to find info on this issue.

My leak seems to be in the polycarbonate bowl below the left air pressure regulator. The first thing I found was that you can unscrew that bowl, but there isn't room to remove it. To get it off, you have to remove the manifold assembly plate by removing the for nuts at the corners. I first tried to remove the allen bolts mounting the manifold assembly, but that didn't work. It's much easier to remove the whole plate the manifold is mounted to by removing the corner screws.

Tightening the bowl didn't fix my leak. I used a strap wrench to get the bowl off. It worked great, but I haven't found the leak yet. It may be up in the regulator portion.

A pic is attached. Red arrow shows where the leak seemed to come from.
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Todd and Karen Pattist
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2007 Double Slide M380 "Bertie"
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Old 09-14-2018
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I inspected the polycarbonate bowl and saw nothing, but, since it was easier than pulling out the regulator, I swapped the left and right bowls (with metal housing). The leak moved with the swap, so it's in the bowl somewhere. I'll pull it again and try to find a source for the bowl (it's probably in one of the links posted here).

That's good news.
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2007 Double Slide M380 "Bertie"
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Old 09-14-2018
D L Hunt D L Hunt is offline
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Hi Todd That part is available from the name on manifold.
I had to replace that part due to air leaks and filter was no longer usable.
The Phillips’s screw in picture will release part. Welcome to B.B. family.
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Old 09-14-2018
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I had a leak as you describe. Inexpensive replacement is still available. Go to this thread - post #12 (previously mentioned in one of your other posts).
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2004 M380 DS & 2013 Fiat 500 Pop

Last edited by NoGas; 09-14-2018 at 05:19 PM.
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Old 09-14-2018
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Thanks Van. I really, really, appreciate the links and all the help I've gotten here. I'll order a replacement as soon as I've figured out the correct item to order.
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Old 09-15-2018
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I have the bowl off. As can be seen in the photo above, it includes:

an by outer metal bowl with vertical slots, threaded at the top

An inner clear polycarbonate bowl chamfered at the top to seal against an O-ring when the metal bowl is screwed in,

a sintered filter inside the polycarbonate bowl,

and

a small black knob at the bottom that holds the polycarb bowl in the metal bowl.

The black knob has a hole in the center that is internally threaded.

I'd like to remove the polycarb bowl and filter for cleaning.

The leak is between the polycarb bowl and the metal bowl.

Does anyone know how to remove the black knob and polycarb bowl from the metal bowl?

It won't thread off, it just spins. Does it pull off? Do I need to thread something into the threaded hole? Or poker something into the center hole (smaller but coaxial with the threads)?

It doesn't seem to have an allen wrench socket I can find.

Edit: The black knob has three years pointing arrows on it, but they don't seem to line up with anything. I'm tempted to insert a screwdriver between knob and metal bowl and pry. Bad idea?
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Last edited by RVinCT; 09-15-2018 at 11:03 AM.
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Old 09-15-2018
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Unscrew the bowl and look inside. It’s been awhile but I think there was a screw inside the bowl at the bottom holding the plastic part. All those parts are very small. There’s an unobtanium washer that’s part of it and on mine it was leaking when the bowl was pressurized. Couldn’t find it so had to replace the whole deal (see prior post). If you pry you will break that black knob. It’s function is to drain moisture when the bowl is not under pressure. The bowl assembly on a new regulator/dryer might fit the old head, meaning you will only need the bowl from that new valve and would not need to actually replace the whole thing.
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Old 09-15-2018
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We'll, too late on prying

There's no screw on mine. Inside the bowl is a large spring pushing on a sintered filter plate. The filter sits inside a two piece piston cylinder plastic piece. The cylinder pushes down on a brass piece that exits the bowl. It can be seen in the center of the black knob.

The black plastic knob is press fitted onto the brass piece. It can be removed by prying, or probably better, by threading in a 10-32 screw and tightening while preventing the black knob from rotating. The screw will push the brass piece out of the black knob. A small spring surrounding the brass piece will pop out of the black knob. I've got it apart. The washer is outside the carbonate bowl at the base of that small spring. I'll clean it and see if it works while waiting for the Amazon replacement. It was $35, including shipping
. All the others had shipping and handling that added to $45 or more.
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2007 Double Slide M380 "Bertie"

Last edited by RVinCT; 09-15-2018 at 03:38 PM.
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Old 09-15-2018
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Link to the Amazon part?
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Old 09-15-2018
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Quote:
Originally Posted by Dc2x4drvr View Post
Link to the Amazon part?
https://www.amazon.com/gp/aw/d/B00DD...40_FMwebp_QL65

The price seems to have changed. I paid $35.02 with free shipping.
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