383 crankshaft damage
12-23-2012, 10:06 AM
#1
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383 crankshaft damage
Just had my 383 crankshft machined 0.10 and as i was returning home i had to slam on my brakes to avoid getting into an accident. Damn the bad luck the crankshaft got loose and one of the journals was nicked. I took it back to the machinist who looked at it, he said it was fine. I'm not buying it. Journals should have "zero" irregularities. Now i'm comptiplating trashing it or trying to resurface the crankshaft. Any thoughts on this? Has anyone had thier crankshaft resurfaced back to original specs or had a journal resurfaced after getting damage.
12-23-2012, 11:01 AM
#2
"Not being there" I cannot say. But the blanket statement that cranks should have "zero irregularities" is not true. A surface nick which has been polished so that nothing extends upward, IE the nick is flush with and INTO the surface will not hurt a thing.
So the possibilities are two:
1--The machinist is correct and the crank is "fine."
2--He is incorrect, and if he is, this brings the entire rest of his work into question.
So if you are that concerned, I'd drum up a 2nd machinist that you think you can trust and ask them.
One example of what used to be an irregularity was "back then" some guys advocated not just radiusing the oil holes (small stone, grinder) but actually grinding a channel extending out from the oil hole to help distribute oil on the bearing. This all must be finished so that no burr is above the crank surface. If those are not "irregularities" I don't know what are.
A quick photo off the www
http://www.hotrod.com/techarticles/e...ngine_buildup/
So the possibilities are two:
1--The machinist is correct and the crank is "fine."
2--He is incorrect, and if he is, this brings the entire rest of his work into question.
So if you are that concerned, I'd drum up a 2nd machinist that you think you can trust and ask them.
One example of what used to be an irregularity was "back then" some guys advocated not just radiusing the oil holes (small stone, grinder) but actually grinding a channel extending out from the oil hole to help distribute oil on the bearing. This all must be finished so that no burr is above the crank surface. If those are not "irregularities" I don't know what are.
A quick photo off the www
http://www.hotrod.com/techarticles/e...ngine_buildup/
12-23-2012, 11:20 AM
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Zero Irregularities is probably a bit of a strong word and yes you have a point about the "iregularities on the oil holes now that you brought it up. Probably something i shouldn't be worried about. I'm basically looking for 2nd opinions before i move forward on my bebuild. As far as the machine shop, they were highly recommended and i asked a lot of questions and did research thier answers just as i am on this crankshaft "nick" issue. Thanks for your input.
12-23-2012, 04:44 PM
#4
Mopar Lover
If the "nick" was material removed it will be ok, if it is like a dent which would displace material and produce a raised portion around it, then it will be a problem. A filing, sanding type of operation could correct it.
12-24-2012, 04:32 AM
#5
Mopar Lover
Welcome to the forum..... Be sure to check out the Mopar of the Month contest.... you have already gotten my opinion.... 440roadrunner has given you excellent advise and I agree with him.....
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