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  #1  
Old 05-20-2011
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Head Issue

My manual head flushes and clears fine, however, over time it allows dirty water back in. Rebuild kit????
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Old 05-20-2011
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Does your head include a vented loop? Is it clogged?

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Old 05-20-2011
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Sounds like a duck valve to me. Try that first and then do the rebuild if it does not help. You should also try to pump enough to get the waste out of the hose into the tank. Hoses that sit with salt water and waste in them deteriorate much faster from a permeation standpoint.
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Old 05-20-2011
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I had this problem with the Jabsco twist-lock that came on my Bene31. I tried replacing the joker valve, but that did not stop it. I installed a full rebuild kit, and that did stop it. I think it was the flap valve at the bottom of the pump cylinder that did the trick.

I also got in the habit of flushing a bowl of fresh water through at the end of a day of sailing if the head had been used. This has the additional advantage of cycling my fresh water tanks faster. Since we mainly day sail, water can stand in the tank for quite a while.
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Old 05-21-2011
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Are there any gaskets that could be bad?
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Old 05-21-2011
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Quote:
Originally Posted by BoatingPoint View Post
Are there any gaskets that could be bad?
Not likely. Water leaking back into the bowl from the discharge line is coming back through the pump. That means the valves are not sealing. The joker valve at the connection to the discharge line is the usual culprit, but it can be other pump valves. A pump rebuild should fix the problem. When you do this gaskets get replaced as part of the rebuild.
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because the replacement twistnlock unit is not much more than the rebuild kit, I bought two of those instead of a rebuild. No luck since I still get backflow- and the joker valve is new. How, exactly, is the twistnlock supposed to mechanically "lock" closed?
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