Mom's terlet refills every hour or so, and I replaced the flapper. It didn't fix the problem.
She has a thirty year-old toilet and I noticed that the "drain hole" in the tank is sloping (i.e., the "rim" is lower on the side farther from the fill tube and considerably higher on the side near the tube).
Is this unevenness a sign of erosion, or do those holes--sorry I don't know their techical name--come on some models at a sloping angle?
Finally, if a sloping drain hole ISN'T normal under any circumstances, is there a way to repair it without replacing the toilet? (As readers of some other posts on this group may be aware, Mom's up to her kazoots in other home maintenance expenses this season.)
It might be possible to repair it with a replacement seat. You have to drain the tank and dry the existing seat, then the replacement sticks down on it. I don't know how much leveling that will do, but I did it to mine that kept dripping, and it has been working fine for years now.
The "drain hole" not being level is absolutely normal. It's made that way so the flush valve (flapper), which is attached to and pivoted at the fill tube, will seat properly. If the tank is refilling periodically it normally means water is leaking out somehow or the fill valve is defective or misadjusted. Your assignment, if you choose to accept it, is to determine "what be happenin".
If the tank water level is slowly going down and there is no water on the floor, determine if the leak is at the flush valve (flapper). The common way is to add some food coloring (I prefer purple but that's just me) to the tank water and watch to see if it appears in the bowl. If it does, replace the flapper with a new, good one. The holy H or Lowe's has 'em - Fluidmaster is the common brand and the red ones seem to be better than the black ones (my experience). While you're at it, inspect & clean the valve seat (the slanted thing you referenced earlier). If it is corroded it will have to be replaced. If it's need cleaning, clean it. It must be free of all debris and provide a smooth mating surface with that new flapper.
If no colored water shows up in the bowl, you may want to inspect the ball float. If it leaks, water will enter it, over time, and it will no longer float as high. As it sinks, it operates the fill valve, adding water to the tank. This is not a very common problem.
Finally, notice the water level when the tank is full and the fill valve has shut off. If it is too high, water may be spilling over into the overflow tube. That's the vertical tube, about 3/4" in diameter, usually next to the fill valve assembly. The tank water level should be about 1/2" below the top of the tube. If it's too high you can adjust the fill valve. Sometimes this means bending the rod that the float is attached to.
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