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Mini Air Bag Regulator
The original pressure regulator for the engine mini air bags is leaking (less after tightening up the bolts). Will any pressure regulator work in the hot engine enviroment? Any tricks from those who have done this for attaching a new regulator? I know some suggest replacing the air bags with mechanical devices. I do not plan to do that at this time.
Thanks.
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25 Replies
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Don’t know for sure, but should be on the airbag just like a tire.
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Best way to be sure is to check the Prevost Car service manual because my brain is saying 45 might be right, but 65 PSI is also bouncing around there.
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Our MX manual says 50 psi.
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Sounds model year specific. The manual has to be consulted.
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Post a picture of regulator you’re writing about.
I have some info and pictures.
BTW…. regulators for generator enclosed areas are built different for a important reason.
AL
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The 1995 Prevost XL motorhome pneumatic schematic for the engine bay air bags belt tensioner regulator says 50psi +/- 2psi. Whether that changed by your model year…????
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got mine set at 25 lb, holds well
Larry Nelson
2002 XLII Vision
2019 Buick Envision
Hurricane, UT
Jeff and Lindsay
91 Marathon XL -
Whoops. Neglected location. Engine belt tensioner mini air bags
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The belt tensioners are all part of the same system and the set point is for all bellows set at the regulator.
There is a schrader valve at the regulator/valve to check system pressure.
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eliminate the air bag completely. Did mine thousands of mile ago with no issues. No more waiting for air bag to inflate before fast idle.
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Like Don & Robert said 50 psi mine never deflates, replace the check valve at regulator and between regulator and engine if you have no leaks it should stay tight.
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I also replace all belt tensioner air bags and plugged the system. It became a never ending saga with fixing leaks or repairing the system. The check valve was a constant issue, plus leaky air bags, plus a leaky valve or a leaky regulator or leaky fittings.
Now I use “jack screws” made from stainless steel threaded rod with SS nuts. I can loosen the system and change any belt in about five minutes. Not as easy or as elegant as the Prevost system but no more constant maintenance on the system either.
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Great idea. May consider after we get our triple 3A-74, three in one belt. Where’s this check valve. Cant seem to locate on drawing
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The check valve has to be at the inlet side of the regulator or valve. I cannot remember which is first in line. The reason for that location is so when the valve is turned to exhaust air pressure the check valve is not downstream preventing that.
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