Replacing Toilet Seal

zach477 wrote:

RayChez wrote:
If the toilet holds water, then you do not need a seal. Before you start on any trip on your coach fill up the traps on your sinks, kitchen and bath and run some water through the shower drain, also your washer. It will stop your smell that is venting through the traps.

I would also recommend Happy Camper to eliminate all odors even when dumping. Best thing I have ever used. Do not use the blue stuff they sell at Wal-Marts and some RV stores. That just camouflages the smell. Happy Camper dissolves the solids and turns it back into water. It is an enzyme that eats it up.

At this point I've narrowed it down enough that the seal at the toilet flange is the leading culprit. Even though the bowl holds water, I think the sewer gas is either coming through the point where the toilet meets the floor, or where the "seat" part of the toilet attaches to the base...there is a lip there that may not be air tight.

It is definitely coming from the black tank, and it definitely seemed to be coming from somewhere very close to the toilet not the drains or from under the sinks. I had leaky air admittance valves at one point and I am very familiar with the grey tank odor. This was definitely black tank odor.

Floor gasket seals the floor flange to the toilet base 'tube' (that goes from bottom of base up to bowl seal)

Black tank odors can only come up thru bowl seal (not holding water) or from around floor flange gasket

Turn off water supply, disconnect water line to toilet, remove hold down bolt nuts and lift toilet off flange.
R/R gasket
Reinstall toilet....only tighten hold down bolt nuts enough that toilet is firm/stable....no not over tighten.

Check tightness of nuts after couple days of use and for any water drips from fittings on water supply