Minor Vacuflush leak - tips on most likely cause ?

[Milacron]

One of four toilets...about every 45 minutes the Vacuflush pump will come on for maybe 4 seconds...presumably to build vacuum accumulator tank back to set pressure. No big deal except the pump is loud enough to possibly wake a light sleeper in the forward port stateroom. Have yet to investigate it but could be as simple as needing to snug up the duck valve fitting on the pump ? Other possibilities ?

 

[Pascal]

Snugging up the duckbills will often twist them inside and make it worst. A leak that small can be hard to find as it will be hard to hear

How old are the DUckbills ? I ve has some lasting as long as 7 years but if more than 3 or 4 years start by replacing them. Easy job and cheap. Use liquid soap on the flanges to prevent twsiting them

 

[Dan Mapes]

If the water in the bowl is drawing down, the seals in the bowl have to be replaced. At that point the ball valve should be replaced as well. Otherwise look for loose clamps at all connections. BTW they should all be double clamped.

 

[Milacron]

If the water in the bowl is drawing down, the seals in the bowl have to be replaced. At that point the ball valve should be replaced as well. Otherwise look for loose clamps at all connections. BTW they should all be double clamped.

Good point about the water in the bowl...I think it retains water ok but will look again.

 

[bobk]

There are lots of seals in these heads. The top bowl seal, which if the toilet is retaining water is probably OK. Next is the lower surface of this seal below the ball. If this is the issue, tighten the clamp band. Also the shaft to which the ball is attached can leak. Next in line is the hose connection to the bottom of the tank. Then any joints in the hose. Four duck bills around the pump. The vacuum switch on the accumulator tank. Sometimes the leak can be heard with a stethoscope if you pull the diaphragm off it and shut down all motors etc.

Bobk

 

[drburke]

If the obvious bowl seal doesn't fix it, I think Sealand said the pressure switch was the next most common source of leaks if your duckbills are ok.

DAN