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Old 06-17-2013, 04:02 PM   #1
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Black water tank valve stuck open

Just purchased a 2000 31' classic. Nice in all ways except this one. The valve was left open when not used and now it is stuck. Have sprayed lots of water in tank but no success. Any good ideas? Can't use system till we get it closed
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Old 06-17-2013, 04:57 PM   #2
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You can buy a fitting that will fit on the end of your dump pipe that has it's own shut-off valve and even a hose fitting for back flushing the tank. It will allow you to fill the tank and let it soak to see if you can free the valve. If not, the valve will need to be replaced, but the flush fitting is still a good tool for backflushing when traveling.
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Old 06-17-2013, 05:06 PM   #3
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Inconvenient, but not that hard to repair. (If the tank is empty it's also a LOT less messy.) There are only 4 bolts that hold the blade valve in place. You can buy easily by a replacement...and be sure and replace the 2 O-rings...use silicone grease on the whole assembly and you will be good to go.
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Old 06-17-2013, 06:28 PM   #4
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Quote:
Originally Posted by BAB View Post
Inconvenient, but not that hard to repair. (If the tank is empty it's also a LOT less messy.) There are only 4 bolts that hold the blade valve in place. You can buy easily by a replacement...and be sure and replace the 2 O-rings...use silicone grease on the whole assembly and you will be good to go.
Thanks for the solution, the tank is flushed and cleaned, how do you get to the valve, it is enclosed in a metal box, I guess the metal pan has to be dropped to access the valves ??? If I drop the pan will replace both valves.
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Old 06-17-2013, 07:13 PM   #5
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with the above mentioned fitting with its own shut off u are good to use RV. however, if u wish u can try to clean the slot the blade slides to close to opening. I use a # 14 stripped copper wire bent with a small 90 degree end. working it up and down each side of the slides to remove anything in the groove. I then dab DOW # 111 along and inside both grooves. Also, a little #111 on the exposed shaft. This should allow the slide to move very easily. Might have to push a little hard to get the shaft and blade off their binding spot. Once a year maintenance and excellent results.
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Old 06-17-2013, 07:43 PM   #6
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The Airstream factory made a repair to our black tank valve last year. Rather than drop the entire belly pan they simply cut about a 16" X 16" section out of the pan to access the valve.

After the repair was made the technician used a slightly larger piece of sheet metal - maybe 18" X 18" - and attached the new "cover" to the original belly pan with sheet metal screws.

There may be better ways to access the valves but this seemed like a reasonable solution to me.
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Old 06-17-2013, 09:09 PM   #7
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Quote:
Originally Posted by mojo View Post
You can buy a fitting that will fit on the end of your dump pipe that has it's own shut-off valve and even a hose fitting for back flushing the tank. It will allow you to fill the tank and let it soak to see if you can free the valve. If not, the valve will need to be replaced, but the flush fitting is still a good tool for backflushing when traveling.
I would try this solution before cutting shopping repairing. You may need a Thetford to Valterra adaptor for your sewer line then a valve with Valterra fitting. Valterra hoses and fittings are a lot easier to find that Thetford. Attach the valve then partially fill the tank with water and a cleaning solution then go drive around. The problem might cure itself. It will at least be usable for the short term with the outside valve in place.
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Old 06-18-2013, 11:40 AM   #8
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Black tank valve stuck

My valve stuck half open. I used the flush fitting others have talked about poured in about a half cup of Murphy's oil soap then filled tank about half way.
Let it sit six hrs then slowly pulled on the valve handle back and forth small amounts until in worked loose. Has worked fine since. Best of Luck.
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