American Standard toilet questions

Hey folks -
I've run out of ideas and need some plumber's opinions. I have a one-piece American Standard toilet (new style #5, if that helps) on which I recently replaced the whole old ballcock/fill valve assembly with a Fluidmaster 400A. That went in fine, no problem. I also bought a replacement (non-AS parts) Acutator and disk becuase, like a genius, I accidentally snapped the old one off its base before I realized how it's attached. Okay, new Actuator (the tube flapper) and new disk that comes with it go in. After the fill valve stops, there's still a contant (although small) amount of water running into the bowl. I turn the water off, watch it slowly run down to the bottom of the tank, and suppose it's the gasket between the Acutoator base and the bottom of the tank. I bought a replacment AS gasket and installed it. No difference, even though I tightened it well. I took new disk 1 off of the Actuator and replaced it with new disk 2 (from Fluidmaster) and it still leaks, but a whole lot less. Still, the water level eventually gets low enough to trip the valve for a second or two. Also, when flushing, sometimes the Actuator doesn't close over the hole fast enough, so it actaully bounces up and down and eveything continues to run. *Sigh*. The only thing not yet replaced is the whole Actuator assembly (float,disk and base) with true American Standard parts. The plumbing supply place keeps unkind hours, meaning I'm looking at another week, but before I go back again I was wondering if this make sense to anybody. Do one set of replacement parts *REALLY* make that much of a difference? Or does this leak sound like (God forbid) a crack in the tank or some other bigger problem? I can't believe that this is giving me this mich grief, I've done this on other toliets before with success. Any help greatly appreciated.
Thanks.
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JavaMan wrote:

The replacement discs are pure junque. They are warped or get that way from the packaging and storage. Look for genuine AS discs or keep trying different ones.
AN alternative is to install the FluidMaster "FlusherFixer" which attaches to the seat with special putty. It can be tough to set up in an AS due to space.
For the disc lifting due to water flow, throttle the flow down somehow or build a small "dam" to protect the disc.
Good luck, Jim
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I use a "Corky" flapper on my American Standard Cadet. It drops down as soon as the flush lever is released, so there are no floats on the flapper to adjust, etc. It has lasted well, for over two years. I realize that there are American-Standard parts that are engineered to give certain amounts of water per flush, but I see no need for all that. A quick little tap for pee, more for a torpedo and paper. Release when it's clear, and the flush is stopped. Isn't that the way water conservation is supposed to be? I think JavaMan needs to rethink his path.

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