Agree can be repaired. If you leave it the strain of the bolt will open that crack wider and you risk pulling out the thread insert even more than now. A good welder should be able to penetrate down far enough to be a meaningful repair. A surface weld will fail promptly.
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Jim Nissen
1955 M38A1
Patent Plate MD74784
Engine Plate MD85578
BS Hood Number 20974784
A good welder is not necessarily trained on iron; and he can ruin a block easily. Be very careful; welding iron is nothing like welding steel. I would ask Abrahams, but you aren't here.
The problem becomes to be more complicated....my mechanic said that the milky oil was from......hmmmm bad sleeves...the first mechanic that make my restoration put two pieces of sleeves the mechanic that i gave it to fix the milky problem told me that was the first time that he had see that as a result water comes from there to oil
don't give up!!
M151A2,1970
M38 1952
GREECE
E-MAIL:vzisimos@yahoo.gr
Regards
Baios