I have a cast iron toilet flange that no longer holds the flange bolts. The area corroded just enough that the bolts will no longer slip into a secure position. The rest of the flange is too secure to knock loose and replace with a closet flange. I bought a hydroseat to secure onto the existing flange, but the problem I’ve run into now is the concrete slab I am trying to secure it to, the area one of the four screws is being screwed into, the concrete has deteriorated. Does anyone have a solution I can follow to secure something to the Existing flange collar that does not include me trying to remove that?
Iron toilet flange problem
flangetoilet
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I had a similar problem once but the leak was visible and the outside of the toilet bowl was wet. Flushing from the tank produced leakage but flushing with a bucket did not.
It sounds like clean flush water is somehow escaping on its way from the flush valve to the toilet bowl. This could be from a misaligned tank fitting or a crack in the ceramic material. I assume that you have found no water running down the outside of the fixture.
Depending on the design of the toilet, the connection between the tank and bowl parts may include a metal fitting set into the bowl. This can become loose or cracked and thus leak water outside the flush pipe but still inside the toilet.
Or an imperfection or crack in the ceramic could allow clean water to escape from the rim passage or wash passage, well, whatever it's called and the design of these passages varies a lot. The point is, flush water can escape its proper path and still not get outside the toilet where you would see it.
EDIT: couple of pictures to show what I mean:
The red callouts show where an invisible leak might occur only when tank flushing and not when bucket flushing.
See how the broken remnant of your old flange is marked "For Cast Iron"? The product you linked to in your question specifically says it's for PVC.
You should use a heavy duty product made for use with cast iron, and screw it securely to the floor with stainless steel screws after you set it. Something like this:
Best Answer
Do you have any friends with a wire welder? These little welders work well for filling the holes and retapping.
I usually grind the heavy rust then mark well beyond the holes so I can re drill in the same place. Heat the area around the hole with a torch then using a wire welder Fill the holes with common wire let cool grind flat. Drill and tap then make sure to use brass screws so they don’t have problems.
I have done this probably 2 dozen times with good success 3 or 4 on my own homes one that I know is still good 20 years ago. Several that we still owned for 10 years after and they were fine.
They make kits that you can cut the flange but if there is good metal and you can drop a weld it works better.