The engine in my grandson's dirt bike locked up. It was a cam bearing that blew. My son brought me the head to remove a broken cam retainer bolt. I was able to remove the cam shaft, but the broken stud was not budging. So I drilled it out a bit and used a bolt extractor. The extractor broke off inside the drilled hole. Clearly, the extractor is hardened. A carbide cutter won't touch it. My plan is to use a burr and patience. Might have to use a diamond burr. I don't have access to EDM.
Assuming I can get the extractor out, I will just drill out the whole stud and chase the threads.
In case it matters, I have access to the far side of the stud through an oil galley in the cam shaft. I have thought about drilling the bolt stud from the galley side, and then punching out the broken extractor. There is nothing critical inside the galley. But it could damage the threads if the extractor doesn't go first.
Any thoughts or ideas?
Assuming I can get the extractor out, I will just drill out the whole stud and chase the threads.
In case it matters, I have access to the far side of the stud through an oil galley in the cam shaft. I have thought about drilling the bolt stud from the galley side, and then punching out the broken extractor. There is nothing critical inside the galley. But it could damage the threads if the extractor doesn't go first.
Any thoughts or ideas?