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Re: [GMCnet] Why not [message #100953 is a reply to message #100937] Sat, 25 September 2010 10:03 Go to previous messageGo to previous message
James Hupy is currently offline  James Hupy   United States
Messages: 6806
Registered: May 2010
Karma:
Senior Member
The EL II is a result of a process of modification and change by GMC to
solve some of the issues with a complex system of compressor, tank, lengthy
air hoses, and leveling valves, all of them with connections that over time
will leak air from the system. When it is fresh, it works extremely well. It
has it's own unique set of problems, but far fewer air connections, and no
rotary air valves. When it is combined with the Quadra bags, it represents
about the best that one could hope for as far as reliability. My Royale, a
1978 EL II, just had a small pair of manual shut off valves in the supply
lines to the bags. When these were closed, the bags would hold at that
height for months at a time, but they eliminated the reactive feature of the
suspension, which is to maintain ride height in response to changes in load.
All the controls in the EL II system are electrical, not
pneumatic. They can't leak air, but they can still fail electrically. The
more complex any system is, the more prone it is to component failure. If
you are the kind of person that buys a new Lexus and drive it 4 years and
trade it off for a new one, and never even open the hood except to show
off all the bells and whistles under there, then try to do the same thing
with your 35 year old GMC Motorhome, don't be surprised if your unrealistic
expectations reward you with a roadside breakdown from time to time. On the
other hand, if you like to get under there and see what makes it tick, you
can stay on top of this very maintenence intensive vehicle. My two cents
worth for today.
Jim Hupy
Salem, Or
78 Royale 403

On Sat, Sep 25, 2010 at 4:43 AM, Larry <slawrence111@yahoo.com> wrote:

>
>
> Just wondering why not do away with the hassle of using the
> compressors and all the leaking lines and valves?
> ____________________________________________________
>
> I have had this thought as well.
>
> All though the OEM system has its purposes, to keep the coach at a "SET"
> level, ( distance from the road, not self leveling due to road crown or
> campground slope ), it also allows alternative settings. You can raise the
> back end when entering a campground with not so flat roads or backing into a
> slot. As mentioned, you can level the coach to some degree when parked.
>
> In my case, I am still fighting leaks, have since I bought her. My PO cut
> tubes and spliced connectors EVERYWHERE, and they leak according to weather.
>
> I have taken the Quad airbag manifold apart a couple times to fix leaks but
> I still start to sag in a couple days if I dont isolate the airbags.
> My levelers work in travel mode on occasion. This I attribute to the
> cheapness of the leveler valve construction, the arm can slip off the body,
> only friction holds it on. When this happens, that side goes down.
>
> I have come a long way in regards to the leaks and trying to get the system
> going. The levelers are new and the leaks are chased every year. When it
> gets cold, the leaks go from very slow leaks to fast leaks, it is all
> temperature intensive. In the Spring when it warms up, most of them seal up
> again, but not all.
>
> Using a fixed airbag is being talked about, the medium is part of the issue
> but you lose the ability to raise and lower the coach at the campsite. It
> would be much like a car with its fixed position. That could be a great
> loss if you use that option.....
>
> But the fact is the medium to make it a fixed system is not yet found so
> even if you want to make it fixed, there is nothing recommended to
> accomplish this task. The medium needs to be spongy so the airbag can still
> react to bumps and such as it would with air.
>
> There are pluses and minis's to everything, Many things can be done, but
> you have to ask yourself, " SELF, do I really Want to make this change and
> what will the result be? "
> --
> Gatsbys' CRUISER :d
> 74 GLACIER X, 260
> 455/APC/4 bagg'r(ver3)
> Remflex Manifold gaskets
> _______________________________________________
> Purchased 08-18-04
>
> _
>
>
>
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