crankshafts usually break for a reason, wrong injector in 820 john deere, welded cranks , cranks that have had a bearing burn up on,bad harmonic balancers, out of balance ect.but sometimes they just break after a long service life. I wont weld on a crank or even grind a crank if a bearing has spun on it anymore. but I have in the past One was a 396 chevy I built the engine for a freind in 1985 knowing the rod journal had been welded but also it had been run for several years prior. The engine made a funny sound shortly after being fired up. front journal broke. I flipped engine upside down pulled crank out and discover piston had been hit, but it was the one piston that could be pulled from the bottom . I made special ring compressor to put rings and piston back in from the bottom. That engine is still running strong today.
most of the others not so good of results when crankshaft broke.Paul
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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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