this I have read through the other threads on bubbling but after trouble shooting but would still appreciate any advice in case I have missed something
I have a 10 month old Lagoon
42 with 3 x Jabsco
Quiet Flush 37245-1692, the system layout is as per this attachment. It is salt water
flushed using A Jabsco
Par Max 4.
One of three toilets is bubbling and it only started recently. The bubbles are large, take a little while to start after flushing
and then after a while they stop. The bubbles are clear with no indication of waste backflow. There is no hissing / pressure noise
associated with the bubbling.
The vent/overflow pipe from the top of the tank is large enough that I have been able to run a garden hose pipe all the way up it from outside until all the hose water
went into the tank. There is no indication of any type of blockage or pipe restriction.
Access to the tank is in the shower
and the removable panel is sealed on three sides ... so I've not removed it ... yet.
The tank has been open and empty for days so to trouble shoot further, I filled it completely up until water
escaped from the vent / overflow pipe, the flow rate was high so again no indications of blockage. When emptying the tank the waste water flow rate is high and constant without any gulping. Interestingly, the toilet bubbles even when the deck pump
out fitting is removed which indicates this can't be a blockage causing a tank pressure issue.
I have removed the pump
and cleaned it. Whilst doing so I could hear the air coming from the waste pipe through the joker valve. I removed the waste pipe and joker valve, cleaned it and put it back together (no spares onboard).
Once everything is back together the toilet stills bubbles.
After the waste pipe exits the toilet, I am unable to see or access it until it nears the tank but I suspect that it runs downhill at some point before running up to the top of the tank.
So ... my naive first time troubleshooting of a marine
toilet and my hypothesis is that the toilet pumps some air into the pipe which stays toilet side of the low point and bubbles back through the joker valve which needs replacing.
Does this make any sense or have I missed something?