trying to find out why my coach sags on the drivers side - Printable Version
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+--- Thread: trying to find out why my coach sags on the drivers side (/showthread.php?tid=621)
RE: trying to find out why my coach sags on the drivers side - Gordon - 03-22-2013
Waiting on insurance stuff, but not holding my breath
RE: trying to find out why my coach sags on the drivers side - Richard - 03-23-2013
Just a little more background on the test fixture based on my own air leak fix journey. I think it is easy to change the solenoid valves as the first attempt at fixing issues with the coach settling over time. Over a period of years and thinking about it I realized two problems with that thought process. One, we don't have a good way of knowing the solenoid valve is leaking, and second those puppies are expensive to just throw money at the problem. I made some fixtures to test the valve off of the coach but that requires removal.
So the idea for the isolation fixture was born. The isolation valve acts as the solenoid valve since it is just downstream of the six pack. If the side leaks down with the isolation valve closed then the leak is between the six pack and the air bags. If it stays up then the leak is in the six pack solenoids. The fixture should cost less than twenty bucks to make and that is 20 percent of the cost of one solenoid valve.
Here is where it gets interesting for Tom. If the coach stays up with the isolation valve closed then how to tell which of the three solenoids is leaking? The down solenoid is easy. There is an exhaust hole on the back of the six pack. A little bit of soapy water on that hole will tell if it is leaking. You can put the isolation fixture on the air line coming from the HCV valve next. If that stops the coach from sagging then the travel solenoid is leaking. If that doesn't stop the sag then the only valve left is the UP valve.
Sorry for the heavy duty logic but I have had two long drives in two weeks and windshield time makes me think.
One more thing. Having a fixture on board would allow you to air up the coach and travel if a HCV valve failed on the road
RE: trying to find out why my coach sags on the drivers side - rheavn - 03-23-2013
Sounds like it is time to build an isolation fixture. I'm slowly coming to the realization that isolating leaks is the only real way to find them. Small leaks are very hard to detect, even with a ultrasonic leak detector. I like your logic Richard.
RE: trying to find out why my coach sags on the drivers side - folivier - 03-23-2013
Excellent thoughts Richard.
Steve lets build two when we get there Tuesday.
RE: trying to find out why my coach sags on the drivers side - rheavn - 03-23-2013
Sounds good!!!
RE: trying to find out why my coach sags on the drivers side - encantotom - 03-23-2013
i will take pictures of my crude rig later today. i used the parts i had so it is not as elegant as it would be if i was to buy new parts.
tom
RE: trying to find out why my coach sags on the drivers side - folivier - 03-23-2013
Looks like you could use half the fittings if you are buying some.
I probably gave away enough fittings when we sold the house to make a dozen of those. Ouch, it still hurts!
RE: trying to find out why my coach sags on the drivers side - encantotom - 03-23-2013
gee forest, you trying to make me feel like a jury rigger?
i am though.
well, after i was done with the sat dish install, i dumped the air and took my test rig off the driver side rear where i had it and moved it to the ride height valve line. charged it up and leveled and took the measurements on all 4 corners and noted the air pressure on the jig
will check tomorrow.
tom
RE: trying to find out why my coach sags on the drivers side - Chester Stone - 03-24-2013
Did I miss the pictures? I love rigging stuff and am anxious to see the installation.
RE: trying to find out why my coach sags on the drivers side - smagown - 03-25-2013
Keep on driving Richard!