Good crank or bad

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Old Jun 12, 2011 | 01:17 PM
  #1  
67Olds442X2's Avatar
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Navy P-3 FE (Ret.)
 
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From: Great Mills, MD
Good crank or bad

Since #1 rod bearing spun I have a nice lip on the journal where the rod dug in. The crank rod journals had been cut .010 before. I'm getting a reading of 2.490 where #2 rod was and 2.4688 where #1 was at the lowest point. Now since the lip or raised area is maybe 180 degrees or half way around the journal and the difference is .0212, .0424 would have to be taken off to make the journal round again. Now .0424 plus the .010 equals .0524 and .040 is the limit I believe so if I did this correct, it also equals I'm out of luck.
Is the limit .040 and am I correct in my assumption? Thanks.

Last edited by 67Olds442X2; Jun 12, 2011 at 04:02 PM. Reason: changed wording
Old Jun 12, 2011 | 03:05 PM
  #2  
jpaulwhite's Avatar
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Yes
Old Jun 12, 2011 | 06:17 PM
  #3  
67Olds442X2's Avatar
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Navy P-3 FE (Ret.)
 
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Posts: 759
From: Great Mills, MD
Thanks. A good crankshaft wasted over a couple thousands of an inch. I shouldn't have used the term "out of luck", I do have a virgin 455 crankshaft to use.
Old Jun 12, 2011 | 06:53 PM
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Originally Posted by 67Olds442X2
Thanks. A good crankshaft wasted over a couple thousands of an inch. I shouldn't have used the term "out of luck", I do have a virgin 455 crankshaft to use.
But have it checked they usually run big. Shoot for around .0025 clearance on the rods.
Old Jun 12, 2011 | 07:16 PM
  #5  
67Olds442X2's Avatar
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Navy P-3 FE (Ret.)
 
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From: Great Mills, MD
Will do. The crank needs a little work anyway, won't be worked on until next year most likely. I packed my engine pieces away in rubber maid containers and brought to the basement. Funs over for this year
Old Jun 13, 2011 | 10:17 PM
  #6  
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A good crank shop can weld up the bad spot and machine it again to .010 again.
Gene
Old Jun 14, 2011 | 04:42 AM
  #7  
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It still has some potential for a BBC rod,and some additional stroke.
Old Jun 14, 2011 | 03:51 PM
  #8  
67Olds442X2's Avatar
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Navy P-3 FE (Ret.)
 
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I guess I have options and for money purposes I'll use my other crankshaft and hold on to the bad one just in case.
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