BAC Forum

General Boards => Technical Support => Topic started by: Jason Worman on October 04, 2018, 07:53:42 PM

Title: Air System Pressure Gauge
Post by: Jason Worman on October 04, 2018, 07:53:42 PM

I'm wondering about the air bag system. When I park the rig for 3 or more weeks  the air pressure gauge slowly starts to lose psi. When I park the psi normally reads about 90 psi. Three weeks later it has dropped to the 50 psi mark. When driving, there is no issue at all of pressure drop. Thanks

Jason

Title: Re: Air System Pressure Gauge
Post by: Mike Shumack on October 04, 2018, 11:12:37 PM

Wow - you "only" lose 40 psi in 3 weeks?!

Most of us would love to have an air system that tight.
I lose all pressure in my secondary system (red needle) over two days and half the air in the primary system (green).

At least my airbags stay inflated the whole time.

Title: Re: Air System Pressure Gauge
Post by: Jerry Emert on October 05, 2018, 12:00:50 AM

My red tank drains over night.  Green will keep some pressure for a day or two.  Air has no problem keeping up with engine running.  Thanks

Title: Re: Air System Pressure Gauge
Post by: Jason Worman on October 05, 2018, 12:56:49 AM

Thank you for the information.

Title: Re: Air System Pressure Gauge
Post by: Joel Ashley on October 05, 2018, 10:07:44 PM

Threads here in the not so distant past have indicated a common culprit is the hose fittings, at least the ones used after SMC and Monaco took over;  not sure about Jason’s coach.  Some have switched to a different type of fitting with good results, but I think we are talking about a lot of fittings to change on any one coach. 

Perhaps they will remind us here of the details.

Joel

Title: Re: Air System Pressure Gauge
Post by: Mike Shumack on October 06, 2018, 01:03:00 PM

I have found several "Push-To-Connect" fittings leaking.

These fittings are great for the assembly line as they are fast to assemble, but not so good for servicing. There is an o-ring inside the fitting that leaks. It's also helpful to assembly line that on the 90 degree fittings the head swivels - but that's another place for a leak. I find they are almost impossible to disassemble to remove the hose despite what the instructions say (I end up cutting the nylon air hose flush at the fitting).  When testing your air system for leaks, you have to grab each hose and move it around sometimes to see the leak (bubbles).

I have been replacing these P-T-C fittings with standard compression fittings when I find one leaking. I did the rear of coach this year. So far I replaced about five fittings for leaking, and another fifteen or so when I rebuilt my rear HWH manifolds (because the hoses don't release from the fittings as they should).

My next chore is to get under the front of coach, rebuild that HWH manifold and check those hoses/fittings.