EFM Hot Water Coil

ok guys need some advice I'm in the process of removing a hot water coil on a EFM 520 as you can see from the picture.. its not going to be fun. now the odds are against me the rust/cancer is around the gasket so I will assume that when I finally get the coils off that i'm going to have to install a new plate and weld it to the boiler. has anyone ever went this far to repair the boiler
any tips?
Thanks Jeff

Lots of them have been repaired that way. EFM stocks the parts needed for the repair.

Here is a thread with some pictures of boilers being repaired: EFM 520...How Long???

I had to repair mine as it had severe gouges from long term seepage . I built up the gouges of the boiler base metal welding stringer beads and ground them smooth. then I bought the extender from the efm dealer Scrapper. As many know it extends the gasket sealing point outside the insulation jacket so you can see any seepage out side the water jacket from the rubber gasket that you should not over tighten.

What is the procedure/torque spec on tightening the coil bolts?

Well the torque hmm I don't have values but it is a rubber gasket . while it thicker then a typical 125# flange rubber gasket, its around 5/16 thick. . With a rubber gasket you can keep tightening it until it squeezed out and sheers the rubber if you keep tightening so prudence is the quide not foot pounds, is the guide I have. If you need foot pound check out 125# rubber flange gaskets. I have never seen values written on paper. I would start tightening the middle bolt of the plate or coil. and move to the out side to move . I would make three passes minimum, with restraint meaning you only to compress the rubber not smash it.
A firm compression Again the bolts could really squeeze that rubber apart. On mine that has been installed for 5 years occasionally in the summer since I don't use the boiler for hot water I will have one or two drips of propylene glycol , which use as antifreeze. I just gently snug that bolt and correct the leak.