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| Re: Main black tank valve not completely closing [message #334440 is a reply to message #334435] |
Mon, 02 July 2018 14:16   |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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RF_Burns wrote on Mon, 02 July 2018 14:21So my black tank valve doesn't completely close. I can't get the retaining clips to snap over the handle. I'd say its less than 1/4" open, although it doesn't seem to leak. I'm thinking there is some crud built-up in the end slot where the blade closure fits in.
Is it possible to remove the valve's shut-off blade out of the side of the valve so I can get a stiff wire in there to clean it? I'm hoping I don't have to pull it all apart to get to it. 
Bruce,
I am working at remembering how this all goes together. If it is an original Thetford valve, then it has to split at the face side of the entire body. And that can't happen with the valve installed as it is also held together by the mounting screws. This is not sounding real do-able.
As I remember, what you would really like to do, just can't be done.
There is just no way to get at that.....
You could put a good cap on the outlet, put in some of the pot chemical that has a paper digester in it and fill the tank to the 3-1/2" level. Then cycle the valve a lot. If you still have the Thetford flange - Katy bar the door - when you remove it...
I have a Valterra outlet flange and have a cover with a garden hose thread that I could work with...
Unfortunately, a Valterra valve just will not go onto a Thetford tank without some serious magic. I have been trying to design an adapter that would cost less that a new Thetford valve, but it has been much harder than I imagined.
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: Main black tank valve not completely closing [message #334458 is a reply to message #334435] |
Mon, 02 July 2018 17:57 |
JohnS
Messages: 126
Registered: December 2014
Location: Vacaville, CA
Karma: -2
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If the pull handle & rod are original equipment, it may be that the jam nut has come loose and allowed the handle to rotate a couple of threads, preventing the clips from going over the handle. Happened on my 77 Eleganza. Since the valve seems to be sealing, it's a possibility.
Hope that's it... no one likes working on that area of thee MH! John
John Shutzbaugh, Vacaville, CA, ncserv@aol.com;
78 Buskirk stretch, "What were we thinking?"
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| Special Note!! Main black tank valve not completely closing [message #334483 is a reply to message #334458] |
Tue, 03 July 2018 08:54 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Senior Member |
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Bruce and maybe nay otheres...
Special note!!
If the dump valve handle does not lock, use something (anything) to restrain it at the closed position.
Without that lock, the valve can get shaken enough to leak a lot more and then you get the surprise when you try to uncap.....
(Do I have to add the BTDT?)
After that, I used ty-wraps to hold it until I could make proper repairs.
And yes, I my case, the extension rod had backed out of the coupling nut as mentioned above.
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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