| [GMCnet] Sewer Valve Replacement [message #269444] |
Mon, 12 January 2015 07:10  |
Daniel DeLuca
Messages: 120
Registered: June 2014
Karma: 0
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Senior Member |
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Hello,
My sewer valve leaks when it is being dumped, but otherwise is still watertight. I am putting replacing it on my “to-do” list. My coach appears to have the original Thetford valve. It seems that many people like to replace that valve with a more standard valve. Perhaps my google-fu is week, but I have not found instructions on how to do that. I have seen pictures, but I am wondering how difficult a job it is and what is needed. Since I am going to be doing this on my back, on gravel with everything a few inches above my head my primary concern is ease of installation and making sure that I have to do the job just once. Thanks for your advice and wisdom.
Dan
78 Eleganza
Allentown, NJ
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| Re: [GMCnet] Sewer Valve Replacement [message #269456 is a reply to message #269444] |
Mon, 12 January 2015 10:49  |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Daniel DeLuca wrote on Mon, 12 January 2015 08:10Hello,
My sewer valve leaks when it is being dumped, but otherwise is still watertight. I am putting replacing it on my "to-do" list. My coach appears to have the original Thetford valve. It seems that many people like to replace that valve with a more standard valve. Perhaps my google-fu is week, but I have not found instructions on how to do that. I have seen pictures, but I am wondering how difficult a job it is and what is needed. Since I am going to be doing this on my back, on gravel with everything a few inches above my head my primary concern is ease of installation and making sure that I have to do the job just once. Thanks for your advice and wisdom.
Dan
Dan,
Problem: The non-Thetford valves that are ridiculously in-expensive use a different bolt pattern. Some have used one original bolt hole and an adapter to make the old and new work. I have been trying to devise an adapter for some time now, but the first cut cost more than the Thetford valve to produce.
Is it leaking at the stem or the body joint? If it is the stem, it may be repairable. There is an O-ring there. If the stem has corroded. It is new valve time. (Unless you can get some friendly person with a lathe to make a new SS stem.)
There is a rebuild kit for the all plastic Thetford valves. If it is old enough to be stainless one side, there was no kit for that last time I looked. Thetford valves are available from the GMC parts suppliers and other old RV parts people. You can even older from Thetford, but they are as expensive as everybody else and much slower to ship than anybody else. (They would not let me stop in and pick it up on the way by.)
If the system is not currently the all plastic valve, then the frame immediately behind the valve will have to be cut to make room for the valve's pipe sleeve.
Good Luck
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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| Re: [GMCnet] Sewer Valve Replacement [message #269457 is a reply to message #269444] |
Mon, 12 January 2015 10:40 |
Mr ERFisher
Messages: 7117
Registered: August 2005
Karma: 2
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Senior Member |
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Read here
http://www.gmcmhphotos.com/photos/g3232-black-gate-valve-repair.html
On Monday, January 12, 2015, Daniel DeLuca wrote:
> Hello,
>
> My sewer valve leaks when it is being dumped, but otherwise is still
> watertight. I am putting replacing it on my “to-do” list. My coach
> appears to have the original Thetford valve. It seems that many people
> like to replace that valve with a more standard valve. Perhaps my
> google-fu is week, but I have not found instructions on how to do that. I
> have seen pictures, but I am wondering how difficult a job it is and what
> is needed. Since I am going to be doing this on my back, on gravel with
> everything a few inches above my head my primary concern is ease of
> installation and making sure that I have to do the job just once. Thanks
> for your advice and wisdom.
>
> Dan
> 78 Eleganza
> Allentown, NJ
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Gene Fisher -- 74-23,77PB/ore/ca
“Give a man a fish; you have fed him for today --- give him a URL and
-------
http://gmcmotorhome.info/
Alternator Protection Cable
http://gmcmotorhome.info/APC.html
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| Re: [GMCnet] Sewer Valve Replacement [message #269476 is a reply to message #269456] |
Mon, 12 January 2015 12:26 |
Daniel DeLuca
Messages: 120
Registered: June 2014
Karma: 0
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Senior Member |
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Matt,
This kind of confirms my suspicion that it would not be worth doing an extensive modification. I think I will spend the $65.00 and be done with it.
Dan
> On Jan 12, 2015, at 11:49 AM, Matt Colie wrote:
>
> Daniel DeLuca wrote on Mon, 12 January 2015 08:10
>> Hello,
>>
>> My sewer valve leaks when it is being dumped, but otherwise is still watertight. I am putting replacing it on my "to-do" list. My coach appears
>> to have the original Thetford valve. It seems that many people like to replace that valve with a more standard valve. Perhaps my google-fu is
>> week, but I have not found instructions on how to do that. I have seen pictures, but I am wondering how difficult a job it is and what is needed.
>> Since I am going to be doing this on my back, on gravel with everything a few inches above my head my primary concern is ease of installation and
>> making sure that I have to do the job just once. Thanks for your advice and wisdom.
>>
>> Dan
>
> Dan,
>
> Problem: The non-Thetford valves that are ridiculously in-expensive use a different bolt pattern. Some have used one original bolt hole and an
> adapter to make the old and new work. I have been trying to devise an adapter for some time now, but the first cut cost more than the Thetford valve
> to produce.
>
> Is it leaking at the stem or the body joint? If it is the stem, it may be repairable. There is an O-ring there. If the stem has corroded. It is
> new valve time. (Unless you can get some friendly person with a lathe to make a new SS stem.)
> There is a rebuild kit for the all plastic Thetford valves. If it is old enough to be stainless one side, there was no kit for that last time I
> looked. Thetford valves are available from the GMC parts suppliers and other old RV parts people. You can even older from Thetford, but they are as
> expensive as everybody else and much slower to ship than anybody else. (They would not let me stop in and pick it up on the way by.)
>
> If the system is not currently the all plastic valve, then the frame immediately behind the valve will have to be cut to make room for the valve's
> pipe sleeve.
>
> Good Luck
>
> Matt
> --
> Matt & Mary Colie - Members GMCMI, GMCES
> '73 Glacier 23 - Still Loving OE Rear Drum Brake with Applied Control Arms
> SE Michigan - Twixt A2 and Detroit
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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| Re: [GMCnet] Sewer Valve Replacement [message #269477 is a reply to message #269444] |
Mon, 12 January 2015 12:40 |
Dennis S
Messages: 3046
Registered: November 2005
Karma: 2
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Senior Member |
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Dan
Yes, installing a new Thetford valve is the easiest path forward. Use new stainless steel screws to install -- if the bottom two screws are stripped when you remove them, you can drill through and use bolts/nuts.
http://www.gmcmhphotos.com/photos/73-painted-desert-230/p34279-0084.html
Here is how Emery drilled through the bottom two holes.
http://www.gmcmhphotos.com/photos/electric-dump-valve-and-valtera-adapter/p3440.html
Dennis
Daniel DeLuca wrote on Mon, 12 January 2015 07:10Hello,
My sewer valve leaks when it is being dumped, but otherwise is still watertight. I am putting replacing it on my "to-do" list. My coach appears to have the original Thetford valve. It seems that many people like to replace that valve with a more standard valve. Perhaps my google-fu is week, but I have not found instructions on how to do that. I have seen pictures, but I am wondering how difficult a job it is and what is needed. Since I am going to be doing this on my back, on gravel with everything a few inches above my head my primary concern is ease of installation and making sure that I have to do the job just once. Thanks for your advice and wisdom.
Dan
78 Eleganza
Allentown, NJ
_______________________________________________
Dennis S
73 Painted Desert 230
Memphis TN Metro
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| Re: [GMCnet] Sewer Valve Replacement [message #269595 is a reply to message #269477] |
Tue, 13 January 2015 13:39 |
Wander Inn
Messages: 100
Registered: January 2010
Location: Phoenix Az.
Karma: 0
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Senior Member |
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DAN, I made a new stainless rod. I used a piece of 1/4" stainless steel round stock.
I hand filed the end to match the original rod. Drilled a hole at the end.
Mike
Mike & Chris Hughes
1977 Kingsley
Phoenix, Az.
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