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post #1 of 15 Old 05-27-2013 Thread Starter
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Question Head question

We took delivery of our first boat this weekend and enjoyed our first sails on her on Lake Michigan. The previous owner was meticulous in the boat's upkeep. Every owner manual for every part of the boat is in plastic sleeves in a notebook. In addition, extra belts, sheets, blocks, filters, etc were included.

When we left the boat this weekend I noticed that the head had backed up. It is a Jabsco toilet. There is a wet and dry flush. We only used it for liquid waste. We would dry flush/pump and the bowl would be empty. But several hous later it reappeared. I looked in the owners manual but it really wasn't much help. When we left I dry flushed one more time to evacuate the bowl and turned off the sea cocks that supply water and shut the valve on the larger black hose that left the bowl. I don't know how to keep this from reoccurring. Suggestions?
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post #2 of 15 Old 05-27-2013
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Re: Head question

When you dry flush it when it all appears dry then do 10 fast dry pumps. It's gets the water out of the pipes... You are pumping air into them.

Then it won't back flush, and also you won't add as much calcium deposit to your pipes.

Remember to leave a bottle of vegetable own in the head and squirt some in the bowl to keep it lubricated. Otherwise the pump gets harder to use.

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post #3 of 15 Old 05-27-2013
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Re: Head question

open the thru hull

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post #4 of 15 Old 05-27-2013
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Re: Head question

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Originally Posted by Gregrosine View Post

When we left the boat this weekend I noticed that the head had backed up. It is a Jabsco toilet. There is a wet and dry flush. We only used it for liquid waste. We would dry flush/pump and the bowl would be empty. But several hous later it reappeared. I looked in the owners manual but it really wasn't much help. When we left I dry flushed one more time to evacuate the bowl and turned off the sea cocks that supply water and shut the valve on the larger black hose that left the bowl. I don't know how to keep this from reoccurring. Suggestions?
Is your holding tank full? That's exactly what would happen if it is. You can pump the waste out of the head temporarily, but the joker valve will only hold it back for so long. Then it comes rushing back into the head.


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post #5 of 15 Old 05-27-2013
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Re: Head question

Mine does this when it needs to be cleaned. Try dumping some vinegar in it a let it sit for a few days to dissolve the calcium deposits then rinse well and lube to keep the valve easy to use.
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post #6 of 15 Old 05-27-2013
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Re: Head question

You may need to replace the joker valve.
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post #7 of 15 Old 05-27-2013
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Re: Head question

I go with the full tank. Before doing any kind of maintenance, pump out first. If that doesn't take care of the problem, look elsewhere. You may be due for a basic head re-built, which is really no big deal to do. I've done 3-4 over the years.

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post #8 of 15 Old 05-27-2013 Thread Starter
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Re: Head question

The previous owner was so great that the holding tank was clean and both water tanks were full. Even the fuel tank and propane was full! So it's not that the holding tank was full. I will try additional pumping of the dry flush and then look at doing a rebuild.
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post #9 of 15 Old 05-27-2013
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Re: Head question

If you know your tank is not full, and it pumps away easily then the Joker valve is your most likely suspect as already mentioned. They can get calcified and won't close effectively losing their effectiveness as a 'check valve'.

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post #10 of 15 Old 05-27-2013
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Re: Head question

Hey,

In case you don't know, after you use the head you MUST pump a decent amount of water through the head. This is to push all the waste through the hoses and into the holding tank. You do now want waste sitting in the hoses. Do your thing, pump water through the lines, then pump the bowl dry.

If liquid reappears in the bowl then the joker valve is bad. If you run enough water through the lines, then it doesn't really matter is some liquid backs up.

good luck,
Barry
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