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Old 09-30-2008, 10:31 PM
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Join Date: Sep 2008
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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.

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Old 09-30-2008, 10:43 PM
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Location: Seattle
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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.
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1988 F150 144,000 miles (leaks all the colors of the rainbow)
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Old 10-01-2008, 10:36 AM
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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.
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Old 10-01-2008, 04:54 PM
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you need to drill and tap

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