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Joe Green
01-17-2000 12:43:05
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Re: broken G headbolts in reply to Marvin, 01-14-2000 22:45:10
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On the bolts sticking out, try the old cycle of heat, cool, tap,tap; heat, cool, tap,tap. All threads have a clearance that is reduced to zero by rust in the gap. Heating will expand the bolt in the hole crushing the rust, which takes up more space than the steel it replaced. Cooling it will open the gap back up and give you some clearance to work with. When a bolt is torqued down, the tension on the bolt reduces the clearance on the topside of the threads to zero and puts all of the clearance on the bottom side of the thread. Tapping on the end of the bolt, or stud, opens up the gap on the top side of the thread, and should loosen the bolt in the hole, even if only a minute amount. Repeated cycles will cause an additive effect in opening the clearance back up. While you are tapping, try to turn the bolt out. You might also try turning the bolt in a bit before turning it out. Roger Welsch talks about this in one of his books. Drilling them out definitely works if done carefully, but is a last resort. As Roger says, accept it as a challenge and you can actually have some fun doing it. Use plenty of penetrant such as Kroil et. If you can drill all the way through the bolt, squirt some penetrant down the hole and it will work it's way into the threads from the bottom of the hole up. Tap on it and let is sit for a while. You'll get them out, although sometimes you have to be very patient and methodical. Good luck and have fun.
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