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bent crank..

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Old Jun 28, 2012 | 10:29 PM
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bent crank..

got a 73 f250 with 390 and in the process of rebuilding it, got it tore down and it has a bent crank. Just wondering what would cause that?
 
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Old Jun 28, 2012 | 11:02 PM
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How do you know it's bent ? Are you saying it wont turn in the block ?.
 
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Old Jun 29, 2012 | 12:05 AM
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Bending a crank is usually the result of something nasty, like hydro-locking the motor (which also usually eats connecting rods!).

I don't think I've ever seen anyone bend a crank from normal driving. I suppose you could also TWIST the crank if you had big tires and dumped the clutch while trying to pull something (like on pavement) - but again, that's totally weird!

Like Mark asked - is the crank visibly bent? Can you give us some pictures?

-Brad
 
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Old Jun 29, 2012 | 12:44 AM
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Originally Posted by piratius
Bending a crank is usually the result of something nasty, like hydro-locking the motor (which also usually eats connecting rods!).

I don't think I've ever seen anyone bend a crank from normal driving. I suppose you could also TWIST the crank if you had big tires and dumped the clutch while trying to pull something (like on pavement) - but again, that's totally weird!

Like Mark asked - is the crank visibly bent? Can you give us some pictures?

-Brad
I would say you would see your driveshaft flying into the woods first. I have seen engine builders check cranks for straightness and call them bent when just a few thou. out. I was also told that when not installed in a block you can knock them out a few thou. pretty easy. You would never see that though just looking at it.
 
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Old Jun 29, 2012 | 10:26 AM
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Yep, if it was bent more than a few of .001" it wouldn't even turn in the block.
 
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Old Jun 29, 2012 | 07:11 PM
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If you lay them horizontal on the shop floor they will start to bend in a short time. I like to leave them in the block or stand them on end without the counterweights touching the wall.
 
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Old Jul 8, 2012 | 10:43 PM
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We had a machine shop check it and they confirmed it, it was a mud racer and had a 3600rpm stall converter, punched .30 over, stage 3 cam, high rise eldlebrock intake, double pumper holly carb 750cfm, bout 400 dollars in work and parts on each head, msd ignition, and to top it off a B&M slap shifter , also 35" tires all the way around.
 
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