Toilets, Sinks, Showers, Tubs and Disposals - cast iron flange under toilet needs repair

the cast iron flange connected to the sewer pipe under the toilet is quite old and cracked around one of the bolt holes. the toilet wobbled. the flange seems to be connected to the sewer pipe with a sleeve(metal on the outside with rubber lining) and ring type clamp over it. whats the best way to repair the flange? repair it? if so, how? replace it? pvc? or cast iron? do i remove the flange by just removing the clamp? it feels pretty solid. i pulled the flooring up too. its plywood over 2x4's. gonna put some new flooring back.


thanx

You can buy a metal ring that goes over the current flange ring and screws down through it. Thats assuming that the current flange ring is still attached to the flange securely. The hardware store should have half rings and whole rings. Make sure the screws are long enough to go through the floor. If the toilet is accessible from below(perhaps on the 1st floor with a unfinished basement), it might be best to just replace the whole flange and a short piece of pipe.

That partial curved piece of steel flange you can buy is called a spanner flange. You slip it UNDER your existing flange (sometimes you have to dig out the floor a little to slip it under there) where the cracked bolt hole section is.

If you want to put in a whole new PVC retrofit flange, you can drill and dig out the old oakum and lead formed around the outside of your old cast waste pipe. A little tedius, but nothing monumental. Easy work as you are working with gravity helping you.

It officially goes under it but you can't always do that.