I pulled the leaking water pump on my 87 only to find the one of the studs was broken. I drilled it out and inserted the extractor and started to tighten.
The extractor broke flush with the block. I have tried drilling it out but no luck. What type of drill bit should I use. The cobalt ones don't seem to do any thing at all HELP!!!!!!!!!!!!!!!!!!

 

Try hitting the broken easy-out with a thin center punch. Hit it in all direction sideways, until you can wiggle it out.

Then drill out the stud to the level of the thread base circle (slowly expanding your drill sizes), and pick out the pieces with an awl, or an icepick (does anyone else remember icepicks?)

Re-tap, and get a new stud, and you're done! :)

Just be patient!

 

When I read your title, I was going to suggest to have a professional remove the stud for you. For some reason, I removed three already for people this week, It must be the time of year for broken studs.

I NEVER EVER use an “easy out” UNLESS, when I am drilling out the broken stud, the broken stud actually turns a little when I am drilling it. I usually use a solid carbide, left-hand spade bit to drill out the first hole. After I get that through, I usually know if an “easy out” will work. Mostly, I drill it out to the tap drill size and re-tap the hole.

Since you broke the “easy out” inside of your hole, you are in big trouble. You could try like Rich B. suggests and try to shatter it and pull the pieces out, but sometimes that doesn’t work. There is a special “die drill”, but that is actually square shaped and can only be used in a rigid setup. I have drilled out broken taps with die drills, but you’ll never be able to do it with a hand drill.

Before I would try shattering it, I would try a cutoff tool in a Dremel and grind a slot in the “easy out” and try twisting it out with a screwdriver. At the least, you may be able to shatter out some of the material. If you can’t get it out doing that, grind some really small chisels and work at the edges.

Good luck getting it out.
:cheers:

 

Actually, the idea is to hammer it sideways a bit all around, to get it loosened; then try to pull it out with a needlenose pliars or similar...

Then drill out everything except the threads, and pick them out. Then re-tap.

It is possible. I've done it to get broken drill bits out of studs/bolts.

 

I broke a water pump bolt on my 73 once and then broke a easyout in it. I ended up welding to the broken end a little at a time till I had a small part that I could grip and the could loosen it and removed it then. :rolleyes: :rolleyes:

 

That does sound like a good idea Rich. I am not going to argue with a 102 year old. ;)

 

TTT :yesnod:

 

I have broken many a tap in a hole and found out that a lot of experience and knowledge of metallurgy is needed to get it out. I use a torch and burn it enough to be able to wiggle it out of the hole with a chisel and sometimes a left twist drill. It takes patience, experience and a lot of cussing to eventually get it out. :eek: