Hello. We recently had trouble with our downstairs toilet. The toilet was leaking at the base and while repairing it the plumber noticed that the cast iron flange was cracked. The flange was replaced as well. However, now when we flush the toilet, it flushes but gets dangerously full like it is about to overflow. All the other toilets, sinks, tubs, washer and dishwasher seem to drain fine. The toilet is an older model and the plumber commented on the tank size being large compared to newer toilets. Can the diameter of the flange be too small and is not allowing the bowl to empty fast enough? Any help would be appreciated. Thanks!

SOunds to me like the toilet was set back in place incorrectly... may be that the wax gasket is covering part of the flange and reducing area for water to flow... Call the plumber back and watch him as he lifts the toilet.. see what happened to the wax gasket on flange AND on bottom of toilet bowl. You should not have to pay him for correcting the matter.

The flange itself is most likely NOT the problem. Something has to obstruct flow to do what your toilet is doing.

Other then that... did something get down into toilet by mistake? Wonder if the plumber dropped something... or if in removing the flange and replacing something got down inside drain (such as the lead he uses to pour around the flange).

Was original problem that started all this anything to do with draining of toilet... or is this just since the plumber replaced the gasket.. Let us know.

It is possible that the wax ring has oozed into the neck of the drain. Flanges end up in all sorts of configurations compared to the floor height. Sometimes the flange sits down a 1/4" and sometimes up 1/4" and anything in between. If your flange was up or an oversized ring were used it may have been too much wax for the toilet. Call the plumber back and ask him why he idid not correct this on hos own. You should not have had this happen and he likely knows that.