I spent yesterday adjusting a ride height control valve according to the procedure in the GMC maintenance manual. Now that I have figured out what is going on with the valve I want to build a fixture to adjust the valve with. To build the fixture I need a sacrificial valve to build the fixture around. If it is available I also need the arm that goes from the valve to the swing arm. _______________________________________________ GMCnet mailing list List Information and Subscription Options: http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
mechanical or electronic? -- Bob de Kruyff 78 Eleganza Chandler, AZ _______________________________________________ GMCnet mailing list List Information and Subscription Options: http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
[mailto:gmclist-boun...@temp.gmcnet.org] On Behalf Of Roger P. Gleason Sent: Thursday, 12 November 2009 11:49 PM To: gmcl...@temp.gmcnet.org Subject: Re: [GMCnet] Height Control Valve
Iknow the same valve was used on the original design, electro-level I, and I have worked on an electro-level II that still had the same heigth valve. _______________________________________________ GMCnet mailing list List Information and Subscription Options: http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
[mailto:gmclist-boun...@temp.gmcnet.org] On Behalf Of Roger P. Gleason Sent: Friday, 13 November 2009 12:18 AM To: gmcl...@temp.gmcnet.org Subject: Re: [GMCnet] Height Control Valve
1976
Iknow the same valve was used on the original design, electro-level I, and I have worked on an electro-level II that still had the same heigth valve. _______________________________________________ GMCnet mailing list List Information and Subscription Options: http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Roger, Not to get off track, but it is very difficult if your ride height settings are way off. Slotting holes, redrilling etc. The adjustable arms that Applied GMC sells are the way to go. Turn buckles on each end and adjustment is as easy as loosening the lock nut and turning the shaft. They are connected on each end with heim joints. Sure takes the aggravation out of that task.
On Wed, Nov 11, 2009 at 8:41 PM, Roger P. Gleason <rgl...@peoplepc.com> wrote:
> I spent yesterday adjusting a ride height control valve according to the procedure in the GMC maintenance manual. Now that I have figured out what is going on with the valve I want to build a fixture to adjust the valve with. To build the fixture I need a sacrificial valve to build the fixture around. If it is available I also need the arm that goes from the valve to the swing arm. > _______________________________________________ > GMCnet mailing list > List Information and Subscription Options: > http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
> I know the same valve was used on the original design, electro-level I, and I have worked on an electro-level II that still had the same heigth valve.
Actually 1973 to the early '76's had "POWER LEVEL" systems. During 1976 they changed to the Electro-Level system. It had electrical switches on the dash(76) or side panel(77/78) but the same valve in the wheel well. Starting in mid 1978, they put in the Electro-Level II system with electric sensors and no tank, but two pumps.
But from reading your posts... I think you want a wheel well valve from any GMC except the electric (EL II) one. -- Mike Miller `73 26' X Painted D. `78 23' Birchaven Hillsboro, OR _______________________________________________ GMCnet mailing list List Information and Subscription Options: http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
What I have found on the control valve I work on is that it was completly out of adjustment the fill valve was opening at the same time as the exhaust port. The 70's was real poor years for Detroit and I suspect that they were not adjusted correctly from the factory. I believe with a fixture they will be very easy to adjust. Also I don't think re-drilling or a turn buckle would be necessary if the valve worked correctly.
The only difficult part of the adjustment procedure is the fluid. No one seems to know where to find it. With a fixture I don't think I will need to remove the fluid. _______________________________________________ GMCnet mailing list List Information and Subscription Options: http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
> The only difficult part of the adjustment procedure is the fluid. No one seems to know where to find it. With a fixture I don't think I will need to remove the fluid.
As I recall, this is a special viscosity silicone fluid, and very hard if not impossible to come by now. One of the Canadian vendors (I think) had some, and did rebuilds of the original valves. Haven't seen anything about it lately. Some one else may recall the name, or details.
----- Original Message ----- From: "Rob Allen" <profm...@camasnet.com> To: <gmcl...@temp.gmcnet.org> Sent: Thursday, November 12, 2009 7:41 PM Subject: Re: [GMCnet] Height Control Valve
> rgleas wrote on Thu, 12 November 2009 16:34 >> The only difficult part of the adjustment procedure is the fluid. No one >> seems to know where to find it. With a fixture I don't think I will need >> to remove the fluid.
> As I recall, this is a special viscosity silicone fluid, and very hard if > not impossible to come by now. One of the Canadian vendors (I think) had > some, and did rebuilds of the original valves. Haven't seen anything > about it lately. Some one else may recall the name, or details.
This is the same stuff by the same people that Dave Lenzi uses when he rebuilds the units. He has all the jigs and fixtures and test setup to rebuild these valves correctly. For the price he charges you cannot afford to do it yourself. The price is typically exchange on the valves and is about $70.
> ----- Original Message ----- > From: "Rob Allen" <profm...@camasnet.com> > To: <gmcl...@temp.gmcnet.org> > Sent: Thursday, November 12, 2009 7:41 PM > Subject: Re: [GMCnet] Height Control Valve
>> rgleas wrote on Thu, 12 November 2009 16:34 >>> The only difficult part of the adjustment procedure is the fluid. >>> No one >>> seems to know where to find it. With a fixture I don't think I >>> will need >>> to remove the fluid.
>> As I recall, this is a special viscosity silicone fluid, and very >> hard if >> not impossible to come by now. One of the Canadian vendors (I >> think) had >> some, and did rebuilds of the original valves. Haven't seen anything >> about it lately. Some one else may recall the name, or details.
On Thu, Nov 12, 2009 at 7:29 PM, John Wright <power...@chartermi.net> wrote: > This is the same stuff by the same people that Dave Lenzi uses when he > rebuilds the units. He has all the jigs and fixtures and test setup > to rebuild these valves correctly. For the price he charges you > cannot afford to do it yourself. The price is typically exchange on > the valves and is about $70.
>> Russ Harms >> Medicine Hat, Alberta >> 78 Royale
>> ----- Original Message ----- >> From: "Rob Allen" <profm...@camasnet.com> >> To: <gmcl...@temp.gmcnet.org> >> Sent: Thursday, November 12, 2009 7:41 PM >> Subject: Re: [GMCnet] Height Control Valve
>>> rgleas wrote on Thu, 12 November 2009 16:34 >>>> The only difficult part of the adjustment procedure is the fluid. >>>> No one >>>> seems to know where to find it. With a fixture I don't think I >>>> will need >>>> to remove the fluid.
>>> As I recall, this is a special viscosity silicone fluid, and very >>> hard if >>> not impossible to come by now. One of the Canadian vendors (I >>> think) had >>> some, and did rebuilds of the original valves. Haven't seen anything >>> about it lately. Some one else may recall the name, or details.
I know that you carry them and that is my backup. I do value you as a supplier and have turned to you as a resource on many occasions. The GMC community I live in don't seem to want to spend money on anything. Then they complain that they do not drive right. As I am sure, you are aware the height control valve is an integral piece of the handling of the coach. What I found after tearing one apart was that it was simply out of adjustment. A adjustment device will go a long way to quieting complaints.
As the quality in Detroit in the 70's was not what it should have been I suspect the adjustment was not correct in the first place since the biggest problem with this design would be water and this unit never had water in it. I also used the original shrader valves.
I also have found a valve to use to make the adjustment device.
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