Jabsco toilet filling back up...

Iain C

Iain C

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My 2004 Bav32 has a Jabsco loo (just the standard 29120-2000 model, not a "twist'n'lock" job). She is fitted with a holding tank, and due to accessibility of the seacock (and environmental considerations) usual use is everything goes into the tank, which we then empty on passage out at sea. There's no Y-valve or anything like that, the outlet goes straight into the holding tank, nowhere else.

Unfortunately with the tank at 50% full, we got a second look at some of it's contents which had come back up into the bowl on passage. Both inlet and outlet seacocks were shut. I'm assuming I just need to buy the appropriate service kit and change all the rubber valves and the problem should be fixed? Or is there another issue potentially? As an aside the loo pumps very well, but the pump is quite stiff and squeaky, and the olive oil trick only works for a short period of time.

Thanks!
 
You need to replace the joker valve at least but not until you have emptied the tank!
A service kit is a reasonable contribution to a twist and lock pump.

This arrangement of everything via the holding tank (also on my mate's Bene) is now apparent. Cheaper to instal no doubt. Hope you have a pump out nearby or fancy a sail.
 
Agree with the above - I always carry a couple of spare joker valves especially as some of the new ones don’t work which you can see after taking them out if the packet and holding to the light. It’s a simple 5 minute job after the first time which seems baffling and difficult (like most new jobs for me). The holding tank doesn’t need emptying for this but the outlet pipe from loo to the top of the holding tank needs to be full of nice clean water as that all pours onto the floor when you detach the joker valve holder.

Stiff use is annoying and solvable usually with olive oil but then it comes back a few dozen flushes later. Cleaning all the limescale out of the piston then putting in winch grease solves it for a season.
 
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It is asking quite a lot for ajoker valve to hold the ejecta back indefinitely. I would be thinking of having a handier valve to close off the holding tank and changing to twist-and-lock.
 
You may well find that the joker valve simply has insoluble salts on the lips, preventing them from closing. A good wash will clean it up for reuse. A slight gap between the lips does not matter as the head of water will close them.
 
Easticks28 said:
I had a similar issue with our SL 400. Eventually it was suggested that I fit a syphon break in the outlet hose. Problem solved, no issues since.
Click to expand...

Don't think that would work with the Bavaria holding tank set-up. The outlet hose just goes directly up and into the holding tank at the top - no loop needed.
 
When I set up my Lavac heads to my waste tank I included an loop above the tank and head level to prevent any possibility of back flow.

The joker valve is a non return valve like what's in the lavac pump.

I looked at the jacsco video and hab not anti siphon loop as in a direct sea water outlet.

 
johnalison said:
It is asking quite a lot for ajoker valve to hold the ejecta back indefinitely. I would be thinking of having a handier valve to close off the holding tank and changing to twist-and-lock.
Click to expand...
It can hold a full pipe full for many months and usually does between our visits to the boat. I think a valve would be an unnecessary complication. It might require a decent head of water to hold it firmly shut.
 
Many thanks all. For the sake of £30 I'll order a service kit...see if that sorts things out! Thanks again!
 
RupertW said:
It can hold a full pipe full for many months and usually does between our visits to the boat. I think a valve would be an unnecessary complication. It might require a decent head of water to hold it firmly shut.
Click to expand...

Agreed. I find I need to replace the joker valve about once a season. It's a 5 minute job.
 
One of my few complaints about my Bavaria is the holding tank arrangement - everything has to go in to the holding tank, there's no bypass arrangement so that pee can be pumped straight out.

My old Hallberg-Rassy 352 had a rather clever holding tank. A stainless steel tank with a hopper-shaped bottom, fitted above and behind the toilet in a locker. There was a big ball valve at the base of the tank, then a pipe going straight down to the outlet seacock. In this pipe was a T-joint, to which the toilet outlet was connected. So, with the outlet seacock closed, pumping the toilet sent the stuff up in to the holding tank. If the ball valve on the holding tank was closed, and the outlet seacock open, pumping the toilet sent the stuff in to the sea. So simple, and pretty well clog-proof, as every time stuff was sent into the holding tank it stirred up the contents.
 
RupertW said:
Between tank and the hull opening - of course.
Click to expand...
Not necessarily. Our gravity-fed tank has a T-piece between bowl and sea, with a seacock above the junction, its handle being just behind the loo. With outer seacock shut and tank one open, the tank fills. With outer open and tank open the tank empties. With both open the tank operates as a syphon break. With both shut, it explodes when pumped.
 
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