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Aux air tank
As Tom has posted about replacing his aux air tank installed by marathon, I have a 2007 with the same issue of the tank not being drained and now rusted up. I have replaced the tank with a aluminum tank. Here is the old tank cut open.
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2 Replies
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This should get every Marathon owner thinking about how bad their system could be contaminated because of those steel tanks. Mine is in 02 and it was bad and here’s a fairly new one, 2007, with the same problem. If you have a steel aux tank installed by Marathon, you better get it checked out. Your aux air pump makes tons of water and if not drained on a regular basis from that steel tank, you likely have a problem.
This could also contaminate the Prevost aux air system if the yellow valve in the steering compartment is opened and allowing the two systems to blend. I do that occasionaly when I’m ready to start and the Prevost aux air is down resulting in loose engine belts. So keep your air dry and drained boy’s, or trouble is coming your way.
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When I did the month long air leak repair on the AUX Marathon system one of the things Leon at Marathon was pretty firm on was the yellow valve. It is to remain closed.
On later model Marathon it carries a sticker clearly marked…..
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