Toilet does't hold water - Fiberglass RV


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Old 10-19-2008, 05:00 PM   #1
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My 25' Bigfoot has the usual Thetford Toilet. Water in the bowl is leaking through the flush valve. I had the same problem last spring and was able to cure it by scrubbing the inside edge of the seal. It felt like it was covered with mineral deposits. I am wondering if I will eventually need to replace the seal/valve? Anyone done this. What am I in for?

Ron Gove
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Old 10-19-2008, 07:18 PM   #2
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Hi Ron,

I don't know which model toilet you have or how old it is. Sounds like you have a blade seal problem. You could replace the entire toilet if cleaning the blade valve doesn't work. You will need a closet flange seal as well. I'm not pleased with our plastic toilet and am considering a porcelain replacement. We have the Aqua-Magic V and I have to tighten the flange bolts frequently because of odor. The blade seal is OK in ours.
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Old 10-19-2008, 08:02 PM   #3
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Mine did the same thing (Or I should say "does")

It is a major project to replace the valve, so I installed an inline shut off valve at the supply line. I turn it on when I use the toilet, and shut it off after I flush.

It cost 4 bucks and some food or a Dr Pepper or something I bribed Fred with to actually wrestle it into the line.
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Old 10-19-2008, 08:23 PM   #4
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Mine does the same thing and I don't see it as a problem. Water doesn't run continuously into the bowl and the valve seals well enough to keep odors from invading the area. I pull up on the handle to put water into the bowl, take care of business, then flush... water does flow into the bowl during flushing... it just doesn't stay there.
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Old 10-19-2008, 09:02 PM   #5
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Angry

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I don't see it as a problem
Never had the black overflow on ya? Mine filled up once from water draining into the tank. Not real good when boondocking and a quick dump isn't easy.
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Old 10-19-2008, 09:13 PM   #6
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Not for me Gina! Sounds like you had a problem similar to the movie RV??

Ron said the bowl wouldn't hold water... not that it continued to run. Or did I miss that part?
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Old 10-19-2008, 09:33 PM   #7
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on mine, I think it's a leaky ball valve and it continually drips water into the bowl and it leaks down thru the flapper thinger that doesn't seat quite right.

Yes< i had the tank fill up to the flapper and start oozing out the top of the tank at the seal and it dripped onto the ground, and on all the junk I had stored under there.

The solution for me was the same.. shut the water source off and leave the bowl dry.. like you, I don't have any smell issues. I leave the lid down as well.
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Old 10-20-2008, 08:54 AM   #8
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Not for me Gina! Sounds like you had a problem similar to the movie RV??

Ron said the bowl wouldn't hold water... not that it continued to run. Or did I miss that part?
Yes Donna, the water only drips until the bowl is about empty--I figured it was a seal problem. I don't have water running continually like a standard reservoir toilet in the home--that would be a REAL problem. Sounds as if one just can't replace a seal without replacing a toilet! And it is only 2 years old!! I will try scrubbing the seal again the next time out. I was also wondering if something like Vaseline might help keep the seal functioning.


Ron
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Old 10-20-2008, 09:26 AM   #9
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Yes Donna, the water only drips until the bowl is about empty--I figured it was a seal problem. I don't have water running continually like a standard reservoir toilet in the home--that would be a REAL problem. Sounds as if one just can't replace a seal without replacing a toilet! And it is only 2 years old!! I will try scrubbing the seal again the next time out. I was also wondering if something like Vaseline might help keep the seal functioning.


Ron
I just discovered, by going to Thetford's web page, that they sell a seal lubricant/conditioner. Will have to try it.
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Old 10-20-2008, 11:35 AM   #10
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Hi Ron,

If simple measures don't work, you might try to get the toilet fixed under Thetford's 3 year warranty.
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Old 10-20-2008, 03:02 PM   #11
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Many of the blade seals are double-lip and the blade goes between them -- Clean the INSIDE between the lips with a popsicle stick or tongue depressor, wood with rounded edges so the seal isn't damaged -- I would put some silicon grease (dielectric grease if you can't find the plumber's silicon grease) on the seal and blade to lube and protect.

Do NOT eat the stuf you may find in the seal...
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Old 10-20-2008, 06:13 PM   #12
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"Do NOT eat the stuf you may find in the seal..."

Sometimes I wonder about you, Pete ;-)
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Old 10-21-2008, 08:40 AM   #13
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Hi Ron,

If simple measures don't work, you might try to get the toilet fixed under Thetford's 3 year warranty.
I will have to check my paper work and see if my Thetford unit does have a 3 year warranty. I assumed 1 year like everything else seems to be
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Old 10-21-2008, 12:20 PM   #14
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We just completed our long trip, and by the time we got to the North Rim of the Grand Canyon, the freeze was on. I was "prepared" with a gallon of RV antifreeze, made by DOW Chemical. All bio-degradable, environmentally friendly, etc. From WalMart.

During the next three days the toilet valve started leaking a little bit, then it became a torrent. The valve is the Valterra one, same as Gina's. By the third day the blackwater tank was full and the freshwater tank was about empty. Every time we turned the water pump on, however briefly, the toilet made loud water noises. Couldn't turn it off with either force or persuasion. Luckily mine is easily replaceable.

I thought RV antifreeze (Camco, etc.) was particularly friendly to seals of all kinds, but either this DOW stuff killed mine or the coincidence made me suspicious. Not a scientific test, but I'm not doing that again. Anyone else have a similar experience?
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