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Here's some random thoughts. You could have it brazed up, and re tapped. You could drill the bottom of the hole out so it wasn't a blind hole, and tap more threads for a longer bolt.. ( not sure there is enough metal for this ). You could drill and tap for a larger thread as well, or even heli-core it.. again.. I havn't seen the crack.. so don't know how much metal there is to work with. I'd deffinately braze before I welded it. If the hole was not near the hyd standpipe... I might not even worry about it.. or if I did.. I'd braze and re-tap it.. and just not torque the heck out of it.. helicore or drill deeper and thread more.. etc... oversize.. etc. The 2 bolts on either side of the hyd standpipe do the bulk of the work.. the rest of the sump isn't presurized.. again.. accept for the lower pump plate bolts around the corner test port at the bottom too. JB weld.. or any goop-glue will not work in this situation IMHO. At worst.. I'd braze/solder a STUD in there.. and forget about it... Think of it as a locating dowel pin for easier placement of the cover to the casting. If there is a bit of metal exposed on the half moon.. I might even let a good welder tack weld the stud into the hole.. just on the inner edge near the open area, where the metal can deform a tad without effecting the casting.. and then I'd braze it too! Add a nut to the stud when the cover is on.. be easy with it.. and have fun. If this is a bolt around the standpipe... I'd be looking for a good machinist.. or a new casting.. latter being cheaper.. Soundguy
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