Major screw up...miracle required (broken bolt)

[Butch (cb)]

Man that's good work. I'd barely wanted to read on from the earlier posts.

[BSA_54A10]

G'day Trevor.
The topic went a little sideways. Its not the pump but the sump where the problem is. A stud hole for the sump plate.
Cheers

I will claim old age .
On a sump plate hole, 50/50.
Lumiweld should hold if you can get the cases clean enough.
I would still go with a weld.
Or even an alloy plug peened so it can nor screw itself out then drill & tap a new hole for the stud.

[Slymo]

Ive used an alloy plug with a corse thread and high strength loctite to great effect in the past. If you are going to go on using a bolt rather than a stud though Id put in a steel insert.

[muskrat]

Yes a plug of the same (similar) material if the hole is really buggered.
With my through bolting of the head and barrels I thread the head (alloy) bolt holes and make alloy studs to screw in and machine off. Then drill the holes 1/2 a hole off. Same with the barrels with cast iron studs.
Same could be done down there.
Cheers