manifold problems

[josherino]

the bottom far left stud broke off into the head and I tried to back it out and it didn't come out, then I used a carbide tipped bit to drill through the center of it but the carbid tip broke off into the stud, the threads came out of the head on the hole next to it. Also the threads partially came out the head on the bottom far right. I am in a prediciment, what should I do? Is there some sort of insert threads or should it be rethreaded larger? And what can I do about the piece of the stud that I just can't get out? I would prefer to not have to pull the head.

 

[oldman]

You can use HeliCoil kit or drill and retap to 10mm. The one with the carbide drill tip is going to be a bi***, is the stud broken inside the head? Nothing short of diamond drill bits will get through carbide, drill around the tip and see if you can pull the tip out with a needle nose plier. Good luck.

 

[josherino]

the stud is broken off inside the head, but I have chunked away at it a bit so it is not still completely threaded