Hi, I have an old cast iron radiator that is leaking between the sections. The joints are cone shaped, male and female, but the sealing takes place at the base of the cone which has a flat area about 1/4" wide. Two
5/8" threaded rods hold the 7 sections together. I've had them apart four times and they still seep. First I used permatex form a gasket by itself. Then I used the same stuff in combination with hand cut 1/32" thick gasket material. Then I used silicone gasket maker with the hand cut gasket material. My plumber says they can't be repaired and it needs to be replaced, but I'm not ready to give up yet - damn close, though. After all, it was put together once before and didn't leak for decades. I've heard that jb weld works, but if I use that and it still leaks, I might not be able to get it apart again. The fellow at the local plumbing supply store suggested using candle wick, yarn, or twine with the permatex or silicone instead of the 1/32" gasket material, theory being that the twine will conform to irregularities in the sealing surface better than a uniform thickness gasket. The fit is not precise, and assembly without any silicone reveals gaps almost 1/16" wide in some places. Oddly, that is not where it leaked, though. Unless I get a better suggestion here, I'll try the twine and silicone.- posted
14 years ago