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Old 02-07-2009, 16:55   #16
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Location: Cruising The US East Coast
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This may not be your problem with a Lavac but it was mine.

On the lid where the gasket fits into the slot between the lid and a raised ring I thought that it was all a once piece casting of plastic. It is not.

The raised ring that the gasket goes around to hold it in place actually is a separate piece and fits into a circular slot in the lid. On my Lavac that ring was not glued into place sufficiently. I finally noticed this after trying to put in a replacement gasket and found I could press the ring in about 1/4 inch all the way around. After pressing in the ring it sealed very well with old and new gaskets.

The ring will slowly unseat with use and require "more pumps per load" until pressed back in.

I re-glued it and all is well...

John & Cheryl Mallon
Sceptre 41
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Old 02-07-2009, 17:51   #17
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Alan - What Jemsea said is what I was trying to describe!

When the lid is closed, and you flush 8-10 times, or so, do you get sufficient water pulled into the bowl, from the suction?
It is very easy to check for the loose seal. Just squeeze the plastic ring inside the seals to see if it moves in a bit. If it does, that was your problem!

Jemsea - Waht did you use to glue the ring back in?

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Old 02-07-2009, 22:29   #18
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I stuck with the lavac when I refitted the boat but added an electric pump The same as lavac supply now )with a 30sec timer on one of the two heads I have. This way the casual visitor just has to push the button. The level of water is critical. To little & the solids may not flush. Down load the full instructions from lavac if you don't have them. I've had the odd person try to pump the water out before use which resulted in tears. The use of the 1ply paper as previously recommended is good advise.

regards bill
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Old 03-11-2009, 19:04   #19
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From reading this entire thread, let me suggest what was suggested to me: Contact the manufacturer! It should have been done right away...a talk on the telephone solved our problem. Perhaps you can do it by email. Lavac Marine Toilets

Good luck!
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Old 03-11-2009, 23:23   #20
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You state that
The suction/seal is impossible to break for a minutes or so after completing a cycle. Therefore I am assuming that the general system is sound.
If the suction is so strong that you cannot raise the lid, then I suspect that you are not getting any fluid in from the water input.

When the lid is closed, the suction from the pump is supposed to draw fresh water into the bowl to clean it and assist with evacuating the solids. Check the water input seacock to ensure that it is not closed or blocked, and check the water input hose for collapsing or kinks.

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