mountain-top mike
New Member
I have a strange one here, at least to me. My Am. ST. 2 piece toilet started leaking a few months ago from worn out black flapper disc. I replaced with red aftermarket disc and still leaked. I bought factory Am.ST. black disc and same thing, although tank drained slower. I then removed the actuating arm from its ears and installed black flapper on seat without the arm attached. Leak slowed, but still leaked into bowl. I then did the same with the aftermarket red disc on seat without actuating arm. Leak stopped. I checked it for two days and the water stayed at the fill line. I then put the red flapper back on the arm and reattached it to the valve and leak started again. I put in a different arm in there thinking there was a problem with it and no difference. There are 5 toilets in the house with the same flush valve and never had this problem with them. I need to find the problem here without just replacing the valve and giving up. It's funny that the arms are very buoyant. I've worked on Standard, American Standard products for over 40 years both vintage and modern styles and have been able to solve their problems, but this one is challenging! Any help would be appreciated.