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Super Moderator
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8,488 Posts
Discussion Starter #1

first your not going to use a TAP to remove anything (TAPS) are used top cut or clean threads,
ok, calm down it happens to everyone sometimes,
second it appears that bolt locked in place due to corrosion,since its located next to the coolent passage in the cylinder head thats not totally unexpected, that can be avoided in future engine build-ups to a large extent by coating the bolt threads on installation with a light coat of ANTISEIZE aluminum paste, available at almost all auto parts stores for use on spark plug threads

theres several tools available,

http://www.recoil.com.au/p_range_DrillOut.asp

http://www.newmantools.com/drillout/how1.htm

the first thing Id do is place several magnets around the bolt and fill the intake and lifter valley with rags to trap any metallic chips you make drilling, then ID carefully center a drill on a dent in the center of the broken off bolt that I made with a center punch,drill all the way thru the bolt (thats important) with a carefully centered 1/8"-1/4" drill (start small and work up in drill size from 1/8" to 1/4")) and spray a good amount of P B blaster spray oil into the drilled bolt hole,then Id use a propane torch to heat the bolt, between the heat and oil it should become looser, then Id try drilling it out, most hardware stores sell 5/16" REVERSE ROTATION DRILL BITS,AND THATS MY FIRST CHOICEbut you may need one of the reverse rotation bolt extractors like I linked to (SEARs and SNAP-ON have similar products ,BUT AFTER DRILLING THAT BOLT TO GET OIL TO BOTH ENDS, a REVERSE ROTATION DRILL is comonly all youll need, but if that does not work.(and it usually does)but youll need a hole drilled thru the center of the bolt and oil and heat applied before useing any drill out extractor, to make sure the orriginal threads don,t get dammaged so be sure you do that first


you can try this
http://www.stovebolt.com/techtips/brokenbolt.htm

http://www.gis.net/~manjo/removing_broken_studs_bolts.htm
http://www.newmantools.com/drillout/how1.htm
 

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DC Pit Crew
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11,957 Posts
interesting...and great tip about the anti-seize thats great stuff
 
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