Bolt is RH thread, 3.75" long and comes with locking goo on the threads so it MAY not come out easily.
You say it's broken a ways up inside the crankshaft, are there threads visible or is that area of the bore unthreaded?
Either way, I would make up a guide tool threaded or not as dictated by the bore that fits inside and has a pilot hole/drill bit guide drilled through (luckily I have a lathe).
Inset or screw the guide into the crankshaft, then you can drill a perfectly centered hole in the remains of the bolt, make it as large as possible to allow the use of a larger extractor that won't break as easily, and HOPEFULLY it will screw out.
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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