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Marathon air leak ? toilet flush alternative ?
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If you feel it is on the Marathon accessory side close that off from the Prevost accessory tank with the valve. Pressurize the coach and with everything at 120 PSI shuit the coach off.
Then open the valve between the Prevost and Marathon accessory systems. There is a lot of air in the Prevost accessory tank and when you open the valve you are going to hear it leaking. Don’t confuse the sound of air rushing into the Marathon tank with the sound of air escaping. You may have to keep doing this until you can isolate the leak. The Marathon accessory air tank can leak due to corrosion so start there.
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Mike,
Stupid question perhaps but have you called Leon at Marathon? if you haven’t I would call him. He might have a suggestion or help you ID the issue.
Bill
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Anyone know which side of this regulator is input and which is output? Cannot see an arrow on regulator and the tubes disappear upwards and I can’t follow them. I want to plumb in to output side.
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Follow the lines, one should originate in the steering bay and the other goes to the rear probably buried in the wire and cable bundle.
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Mike,
Would you like some help locating and
fixing your air leak?We recently sold our coach and have a
vacant 20ft x 50ft lockable, secure, inside storage garage with 50
amp near Longmont Colorado if you are interested. I would be willing
to help you look for and try to fix your leak if you want to give it
a try. No charge, no obligation.Tim
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NO, NO, NO….not the output side…that would mean the pressure regulator would be out of the system and the toilet would be receiving full air pressure. I would remove the input line from the regulator and cap and install your temporary air source into the regulator input. BTW, do not tee into the input line…it may backfeed your temp air source to your leak.
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Thanks again all. Joelselman – I should have elaborated – I was going to hook a small compressor with its own tank and it own pressure regulator into the output side at ~ 60 psi. I realize hooking up 120 psi from Prevost air to output side would be a mistake. Just wanted to have the simplest quick fix and bypass everything in the steering bay.
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Tim T – Thanks so much for the generous offer. I’d take you up on it except we have company this weekend and have to leave next week for AZ. Would have worked nicely as I am not that far away (Kremmling/Grand Lake). Hoping to get a short term fix in place (parts should be here tomorrow) so at least toilet works. Thanks again.
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I am posting this suggestion from a PC member who wishes to remain anonymous.
He said the problem is likely the air sequnce valve has failed and the air is escaping in the hopper which is why it is difficult to hear. He indicated the valve is available from Microphor and is about $400.
Don’t ask me questions because I have no clue, but maybe some Marathon owners can speak to this advice.
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I was under the impression that there was nothing wrong with the toilet. The problem is an air leak up front that wont allow him to build enough air pressure to flush the toilet. Maybe I missed something.
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I am just repeating what I was told. You may be completely correct.
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I’m with you Jeff, who’s on first.:)
Like someone else mentioned, just tie into the Prevost aux temporarily and leave the yellow valve closed making sure you feed the air to the input side of the toilet regulator.
Also, as Jon suggested, with a full tank of Prevost aux and engine shut off, open the yellow valve and you should hear the leak if it’s as bad as you say.
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Thanks again all. Short version is I accumulated a ton of tubing and connectors. Disassembled everthing in driver’s bay sequentially and pressurized (broke some corroded brass fitings in the process; was able to find replacements at local hardware store(!)). Talked to Leon at Marathon etc. Replaced many SMC fittings. I think the Grainger tank is leaking somewhere as best I can tell. Per Leon a relatively rare problem. Whenever the tank is included in the circuit, it quickly loses pressure. Could also be some of the attached brass fittings – I did not disassemble all of them. I’m sure I drove everyone crazy at the campground running the compressor all day. (Better than running the engine to repeatedly generate Prevost air.)
Ended up plumbing in to input side of toilet regulator and now I can flush toilet thank god. Grainger doesn’t make same tank anyumore but they make one that looks similar. This will do for now. WHen I get home may replace tank, but I would want to start with all new brass fittings as well. Thanks again to the group for all the advice.
PS toilet works fine and holds pressure once it is pressurized. Has anyone replaced Microphor toilet with Tecma? How big a job is it? DIY or leave it to Marathon?
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Mike,
Bad Marathon aux tank a common problem. Here’s my post: Rusty Tank
As to the Tecma, there’s already been comments, the foot print seems to be a challenge.
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Change to Tecma not complicated. Footprint is smaller. If you have extra floor tile, very easy fix. Its not that much smaller footprint. Just live with it for a bit. You will love the Tecma.
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