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Re: [GMCnet] Why not [message #323961 is a reply to message #323959] Sun, 17 September 2017 19:20 Go to previous messageGo to previous message
Richard Denney is currently offline  Richard Denney   United States
Messages: 920
Registered: April 2010
Karma:
Senior Member
The solution: Power Level II valves from JR Slaten. Not cheap, but a
permanent solution with vastly better quality internals.

http://www.appliedgmc.com/prod.itml/icOid/738

Rick "who did this years ago and never looked back" Denney

On Sun, Sep 17, 2017 at 8:12 PM, Robert J. Gogan
wrote:

> After rebuilding my rotary height control valves this spring, I was
> initially disappointed that my air springs were still leaking down. When I
> pulled
> the valves out of the dash and soap tested them, they had a slow leak
> around the newly installed housing seals.
> I torqued down the Allen screws and was delighted to see an airtight
> result. I had not cranked on the Allen bolts too hard previously because
> they
> seem somewhat delicate and the instructions warned about overtorqueing.
> The result was great!! The air springs have kept the coach up all summer.
> First time in 30 yrs of coach ownership that this has happened.
> However, today while driving, there was a loud pop that came from the
> passenger side rotary air valve and a loud whine of air leaking. I made it
> home
> before the suspension flattened out completely.
> At home, I discovered that the top piston had been blown out of the bore
> towards the plastic valve. I though this was no supposed to happen as it is
> retained by the rubber O ring on the spring side of the piston. The
> piston that was displaced out of the bore was inspected under the
> microscope.
> Both rubber O ring seals were in place and not damaged. The housing was
> inspected from outside and I could see no cracks. I thought I might have
> overtorqued the Allen screws and cracked the housing. Will have to
> disassemble the housing and see if there are internal cracks.
> My suspicion however is that the replacement O ring that goes on the
> spring side of the piston was undersized or not hard enough to prevent the
> air
> pressure from blowing the piston, that it was supposed to retain, out the
> front of the housing. Has any one else encountered this problem and come up
> with a solution?
> Bob Gogan
>
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--
'73 X-Glacier 230 "Jaws"
Northern Virginia
Offlist email: rick at rickdenney dot com
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