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DougC |
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Senior Member ![]() ![]() ![]() Group: Members Posts: 949 Joined: 6-July 04 From: Dallas, TX Member No.: 2,307 ![]() |
OK, I have 3 broken exhaust studs on my 2.7 six. All but these three came out easily but these 3 were never going to move! I spray (for several days) with PB blaster, used a torch and nothing worked. Finally I bent one on purpose because I was at my wit's end and eventually broke it. I went ahead and cut the other two off in preparation for drilling. I have drilled out the originally broken one and tried using an "ease-out" but no luck (of course). I'm at the point where I can actually tap the hole for the original thread size. What size tap do I need to buy?
Doug C |
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Sammy |
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. ![]() ![]() ![]() Group: Members Posts: 1,190 Joined: 21-January 03 From: Orange, Ca Member No.: 178 ![]() |
EDM (electronic discharge machining) is a process where an electrode is lowered into place slightly away from the broken bolt. An electronic charge like an arc is introduced, and the offending metal is blasted away. They usually have a stream of water directed onto the bolt also. Kind of a fancy air-arc system but much more controlled. Not something that can easily be done without taking the engine apart, plus it is labor intensive and the machinery isn't cheap, plan to spend at least $100 per bolt abd a minimum set up fee. that's at least what I pay at my shop, usually more.
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