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Old 04-20-2007, 10:17 PM   #1
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'60's Thetford valve questions again

The time has come when I will have to deal with the original Thetford dump valve leaking on my 63 GT. I know there are a number of approaches to this problem and I am inclined to try rebuilding it. At one time I came across some excellent pictures of this procedure on the forum but I have been unable to find them again after trying everthing I can think of to search. Anybody know what they are listed under?

I have an access panel in the belly that looks like it will let me get to the valve but I doubt I can get the whole tank out. Anyone done the valve on a 63 GT and replaced the brass valve with a modern valve? I'd like to know how you did it.

Finally if I go the update route should it be Valterra or Thetford that I use as a replacement valve?
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Old 04-20-2007, 10:40 PM   #2
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Does it look like this?
Neil.
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Old 04-20-2007, 10:42 PM   #3
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Not like that mine is older.
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Old 04-20-2007, 10:46 PM   #4
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This might be a better view.
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Old 04-20-2007, 10:49 PM   #5
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Oh, I thought I would have helped. However,a PO had accessed my valve in the past by cutting an access hole from the bottom.
Neil
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Old 05-01-2007, 10:18 PM   #6
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Anholman, my valve assembly looks just like yours. I am in need of the part attached to the valve, my Thetford vale works just fine. Somewhere during it's life I think the end of my assembly has been cut. I can not get a sewer hose to fit tight enough after it's been twised on, big time leak. Any idea where I can get a new or used assembly. Nothing I have found so far has the slight bend to it like yours/mine. All I can find is straight or 45 degree angle parts.

Thanks _ Derek
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Old 05-02-2007, 02:07 AM   #7
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Originally Posted by dnrtheil
Anholman, my valve assembly looks just like yours. I am in need of the part attached to the valve, my Thetford vale works just fine. Somewhere during it's life I think the end of my assembly has been cut. I can not get a sewer hose to fit tight enough after it's been twised on, big time leak. Any idea where I can get a new or used assembly. Nothing I have found so far has the slight bend to it like yours/mine. All I can find is straight or 45 degree angle parts.

Thanks _ Derek
When I ordered my new tank and valve from Andy at Inland RV he asked if my collector pipe was ok. It is so that wasn't an issue for me but he may have what you want. The part that locks the hose is glued to mine so you may have to buy the whole connector. Call Andy. He or any one in the office will help. They were very helpfull to me. Another source for a used assembly may be RV Doctor George, a RV salvage yard in Sacramento, Ca. I don't have their web site address but if you Google it it will come right up front.

Neil.
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Old 05-02-2007, 08:02 AM   #8
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Quote:
Originally Posted by 63air
The time has come when I will have to deal with the original Thetford dump valve leaking on my 63 GT. I know there are a number of approaches to this problem and I am inclined to try rebuilding it. At one time I came across some excellent pictures of this procedure on the forum but I have been unable to find them again after trying everthing I can think of to search. Anybody know what they are listed under?

I have an access panel in the belly that looks like it will let me get to the valve but I doubt I can get the whole tank out. Anyone done the valve on a 63 GT and replaced the brass valve with a modern valve? I'd like to know how you did it.

Finally if I go the update route should it be Valterra or Thetford that I use as a replacement valve?
Sorry I didn't catch this thread the first time it went around, I must have been taking a power nap...
You should have the large brass looking valve, which is very rebuildable, but it uses a no longer available connector to hook your slinky up. If you have the connector, you are in business, if not, you would be much better off replacing the valve with a new one.
I used a Valterra 2" valve (that's what size the hole is in the black tank), and a PVC double Tee for the grey water to hook into. Then I used a 90* elbow, and a 2"-3" adapter so I could put a standard 3" diameter slinky on it. On a later modification I ran the water from the kitchen sink to the black tank.
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Old 05-03-2007, 08:38 PM   #9
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Fixed or ???

Well the gate valve fully closes now.

1) Muriatic Acid
2) Propane Torch
3) Cheap screwdriver
4) Pressure Washer

I dumped water and muriatic acid down the sink drain with the black tank dump valve closed as far as I could get it. Let that sit for 2 days. Torched the head of a cheap screwdriver and bent it over 90 degrees. Used the screwdriver (tried a hanger, not strong enough) to scrape and pry the "crud" loose. The muriatic acid softened it up great. Used the pressure washer to clean out all the loosened stuff. The valve now fully closes and locks into place.

However...
look at the second last photo - the seal came out also. Is it necessary? (I know dumb question) Am I now going to have to drop the belly pan, remove my black tank and rebuild/replace the valve?

Mines identical to anholman's pictured above in post #4
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Old 05-03-2007, 09:12 PM   #10
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I'm in luck as I have two of the Thetford cast elbows. I just adapted to a modern fitting using a Fernco and it has worked fine for two years . The day of reckoning is here for the valve its self, as it is now leaking.
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Old 05-10-2007, 05:05 PM   #11
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I think the pictures you are looking for are under the member name of wagsrp. I ran across them about a month ago because my black tank valve also started leaking.
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Old 05-10-2007, 05:16 PM   #12
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Hey 63air,

I rebuilt mine a few years ago. It comes apart pretty easy, just be patient. If your sliding gate is not too scored, you just need to clean everything up and replace the seals.When I reassembled it I used all stainless fasteners.I had a hell of a time finding an appropriate O ring material, however.

Mine's dripping again now so we're in the same boat.

I'd like to know where I could get some seals in Southern California. The last time I did it I was still in NY.

Keep me posted on your progress.
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Old 05-30-2007, 09:23 PM   #13
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I'm thinking about pulling the tank and converting to Valltera. I know Thetford has a bond on adaptor but it seems like Valltera is what all the RV dealers in our area recommend , Anyone converted to Valltera?
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Old 05-30-2007, 10:18 PM   #14
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Quote:
Originally Posted by 63air
I'm thinking about pulling the tank and converting to Valterra. I know Thetford has a bond on adaptor but it seems like Valterra is what all the RV dealers in our area recommend , Anyone converted to Valterra?
FWIW, I replaced all of my Thetford with Valterra fittings. Why you ask ? They are cheaper and available everywhere. Plus there is a bigger selection of configurations.
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