Posted by Owen Aaland on July 22, 2009 at 06:03:56 from (198.70.47.142):
In Reply to: 544 crankshaft posted by BradT on July 21, 2009 at 12:35:58:
J B farms said: (quoted from post at 05:31:15 07/22/09) There doesn't appear to be any other damage inside the block. This engine was rebuilt 7 years ago and has ran just fine up until the crank broke. All the bearings are fine in it and there was no metal in the oil. I am still trying to figure out why the crank broke I think it was just a freak deal. The crank broke in the metal between the rod journal and a main bearing journal just on one side. Any body seen this before?
That is usually where they break.
Did the crank have undersize bearings in it? If it did it is quite possible that it had a damaged journal that affected the hardening in the shaft. There are also some crankshafts that can not be reground at all and others that must be rehardened after regrinding. They will look fine after regrinding but will fail in use. I have seen quite a few that did this.
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