Toilet Won't seal at base of flush valve

I have a 2 piece standard residential toilet where I think the base of the tank must be malformed in some way.

We can not get a flush valve to seal good at all with the the base of the tank. This is with using new replacement parts, and the original parts (original at least as original as when I bought the place). The plastic housing that holds the flapper will not sit flat without wobbling. It has the angled edge so it fits in the center of the hole.. but the flattest you get it by hand, you can see the threaded end that sticks out the base of the tank is not square to the tank. So as you tighten the plastic nut which holds the assembly to the base of the tank, it actually makes the seal worse.

Suggestions on how to fix this? I was thinking if I had a much thicker rubber washer on the assembly inside the tank it may be able to account for the variances better. What about trying to do something like a bead of plumbers putty? Will that eat at any of the components?

Any other suggestions? I've tried fitting this assembly a dozen + times.. I'm beat down.

Take a diamond blade angle grinder and smooth out the imperfections on the porcelain so the connection will properly seal.

RUGGED said:

Take a diamond blade angle grinder and smooth out the imperfections on the porcelain so the connection will properly seal.

Click to expand...

Hrmm... I think my chances on making a flat, squared surface down in the tank with a grinder would be slim

Its not off enough that it really seems deformed by your hand, but the bodies with the \ / top just will not seal.

Wondering if I can get a new tank piece that will match the bottom so I don't have to pull that up

Well I opt'd for the bead of plumbers putty inside the tank. I'm not worried about it discoloring the porcelain in there, so as long as any stains don't migrate to where it could be seen.. I guess its just a matter of longevity. With a bead inside where the base of the value sat against the tank instant fix for the leak. Crossing my fingers... damn devil toilet!

What kind of toilet is this? Make /Model?