Bolt broke in manifold
 

I broke a bolt as i was installing a new supplementary air valve. The bolt is in the hole. i have tried to drill it out with a high speed stainless steel bit but the bolt is to hard. Does anyone have an idea how and what I can use to remove this broken bolt? Thanks for any help.:confused:

Just as a basic reference, you can use heat, cold, solvent, impact. If there is anything at all sticking out you can try to grab on to it. Sears sells a variety of screw extractor sets. One important concept is that they all have reverse twist drills (they cut in reverse). That way if the drill digs in it will have a tendency to loosen the bolt not tighten it more. The hardness of the bolt sounds like a problem but maybe a fresh bit might work better. It shouldn't be so hard that you can't drill into it. I am not familiar with that specific bolt. Maybe someone else has a better idea. You could try searching. I have seen similar threads before about broken off bolts.

The type of bit you need is cobalt. It's the only bit hard enough to go through a bolt. Use plenty of oil while drilling, take it easy or you will burn up the bit. They are expensive but they will drill through it, I have had to do it for broken lug bolts.

you need to drill and tap