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Air leak repair
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Al,
I have never posted on here but have read since Jon and Tom started this amazing site and amzing people.
You and this entire thread on your repairs is amazing. You have helped me a ton on my own repairs. I would be interrested in your custom air block inside the closet sometime I will get a hold of you.
Here it is: Do you marry the Marathon air to the Prevost air and leave it? You may have said and I missed it.
Some people keep them independent from one another what do you do?
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Doug,
Generally speaking every converter makes connections to the pneumatic system on the coach at the spot designated by Prevost.
To the best of my knowledge on the coaches I have owned Prevost offers the converters two locations to connect for their air needs. One is in the steer compartment and typically has a plastic tag with the word “converter air” etched into it. Ditto for the one in the rear located behind the tag axle, passenger side to the left rear of that little compartment.
Those connection points tap into only accessory or auxiliary air. They are provided with protection valves so if something catastrophic happens the two brake systems will not suffer an air loss below the pressure needed for them to function.
From time to time we learn of someone connecting in a location other than described above. Usually we hear about it because there are problems associated with the connection point such as no protection against moisture, and other issues. While the converter air system and devices share an air supply with the bus auxiliary air systems and devices and while both generally use the aux air tank as the storage device for needed air you are not likely to find converter air system connections scattered around the coach other than the two points I described, and some may only make one connection.
The same can be said of the coach electrical system and how the house and chassis electrical systems are isolated from one another, but do share a common connection point that is protected against one depleting the other.
Depending on how curious you are you can go to the Prevost Publications page accessible through the Prevost Car web site and pull up the pneumatic diagrams for your specific coach. It will not show anything relating to the converter, but it will show the entire chassis systems and will identify the allowable connection points.
http://prevostparts.volvo.com/technicalpublications/en/manuel.asp
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Jon,
Totally correct as always… I have located and work in all locations. Not sure about Liberty but in my steer compartment near the Norgren there is a simple yellow tab that will cut off the Marathon from the Prevost side. If you “marry” them it is possible that you may over work the compressor in the Gen bay to make up for loss of air on the Prevost side if you have leaks. However over a period of time untouched for weeks my coach maintains a great 120 psi in both front, rear and Aux. So in my instance I have “married” them. I am just never certain if the compressor is being over worked to make up the difference as I am not in my coach regulary. Just interested if Al had his married and was not sure if Liberty did the same set-up as I have been taught to let them be independant from one another not to marry them. My coach number is 10 or so away from Al’s so I just couldn’t imagine them being set-up any differently.
Hope this makes sense. If I get some pics I will post them.
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Doug, thank you for your very kind posting. Thanks also Jon, for acknowledgeing me.
Your refering to the yellow valve on the right bulk head under the drivers seat,….. pictured ?
This yellow plastic valve opens turning to 3 o’clock Tag on pipe “open only if compressor fails”. The correct normal position is pictured….. 6 o’clock.
This valve isolates Aux air supply from Prevost air supply. Opening this valve allows unfiltered moisture air into your Prevost system coming from the green Aux air tank.
In talks with Leon at tech service Marathon the two (2) systems should only be combined in emergency need.
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Al,
That was exactly my question. I was taught never to marry them just as the sticker indicates. It has been a debate for some time. However I did go against that and I did marry them a couple months back. I will revert back as suggested and repair independently as needed. Thanks
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Nice Job Al, you are now our resident Microphor toilet expert.
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