27-06-2021, 04:36 PM
Without getting into hot work you could machine up a 1/10" thick washer from a piece of silver steel to be a snug fit in the spotface around what's left of the hole. I would harden it and temper to dark straw. It looks like there's enough metal there to stop the big washer tipping if it is a good fit. You could put some Devcon or JB weld in the broken away portion at the base of the block face. It would be in compression there so should help prevent a further failure of what's left of the lug.
If I was going to do a hot repair I would use a Manganese Bronze rod to braze in a thick steel washer which would also incorporate a piece which fills the gap down to the block face. Biggish castings like these need a huge amount of heat to perform such a repair. The last one I did had a couple of hours on the top shelf of the domestic oven on maximum temperature, followed by a mate holding a propane roofing torch on the underside while I used an Oxy Acetylene torch with really big (No. 18 IIRC) nozzle on top to braze up the casting.
If I was going to do a hot repair I would use a Manganese Bronze rod to braze in a thick steel washer which would also incorporate a piece which fills the gap down to the block face. Biggish castings like these need a huge amount of heat to perform such a repair. The last one I did had a couple of hours on the top shelf of the domestic oven on maximum temperature, followed by a mate holding a propane roofing torch on the underside while I used an Oxy Acetylene torch with really big (No. 18 IIRC) nozzle on top to braze up the casting.