Re: Re: Re: Re: How do you remove bolt?
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Posted by C J on May 13, 1998 at 07:23:43:
In Reply to: Re: Re: Re: How do you remove bolt? posted by John on May 12, 1998 at 19:17:38:
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: : : : Eastwood corp. offers left-hand drill bits which are really nice for drilling out damaged fasteners. Be sure to drill all the way to the bottom of the old fastener. In the event that the drilling did not remove the fastener, you now have an access hole to permit penetrant a route to get behind the fastener to permit conventional removal utilizing an easy-out. In the event that the aforemenioned does not work, insert a length of bar stock into the now resultant hole, wire feed weld to the defective fastener and remove with vise gripes while the unit is still hot.Ed : : Good advise, I might also mention, there are different reasons bolts are broken off. (1) They have been over torqued, these are the ones that are candidates for the easy-outs. (2) They have been bottomed out in the hole then broke off, not good. (3) They have rusted in place and broke off when trying to remove them. Penatrant and heat as Ed described. And the meanest of all (2) and (3) combined. This is when you hope your drilled the hole right down the center. Use a drill the size of the minor dia. of the thread and peel out whats left of the thread. If you totally mess up the original threads, drill it out and install a helicoil insert.
: : The biggest danger in this exercise is breaking off the easy-out in the hole trying (1).
: : ::::Bonehead : I did just that - broke off the largest easyout in a 3/4" hole on underside of tractor. No drill in the world will drill out a hardened piece of steel like that. Finally used oxy-acetylene outfit and burned hole down center of old stud and thru the burried portion of the easyout. (Had to use full fire fighter protective gear!) This worked well. Old stud came right out using the remaining shank portion the easyout.
: John
Yep, John is right if you leave an easy out in the hole. I stumbled across a great solution to this problem a few years ago when this happened to me. In despiration I lit up the torch cause we all do know you cannot drill it out. The flame heated the easyout quickly and a very brief spurt of oxygen blew most of it right out. Ya, watch the sparks. The reason it works is that the easyout, being a very high carbon steel actually melts at a lower temp that the surrounding metal, the relative differences in volume of each respective material has something to do with it also. At any rate it works slick as a whistle. Way to go ,John. Using the torch initially doesn't work nearly as well because the bolt and the base metal are relatively similar so will melt about the same temp. Good Luck,
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