crank laid on side...truth or wives tell??? - 460 Ford Forum
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post #1 of 35 (permalink) Old 08-15-2009, 12:41 PM Thread Starter
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crank laid on side...truth or wives tell???

this is one of those age old questions. Its still unclear to me whats the truth and whats not.....I've always been told to never lay a crank on its side and should be either stood on end, stored in block, or hung straight up and down........I have heard what I just stated and also I've heard that its just a "wives tell", that no harm could come. Now whats the REAL TRUTH???

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post #2 of 35 (permalink) Old 08-15-2009, 12:52 PM
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it will sag over time
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post #3 of 35 (permalink) Old 08-15-2009, 01:00 PM
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What then keeps them from sagging when stored in a box from the manufacturer on shelves or pallets for extended time?

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post #4 of 35 (permalink) Old 08-15-2009, 01:12 PM Thread Starter
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mustangsandfords magazine says:

Laying A Crank On Its Side
Absolutely never lay a crankshaft on its side-not even for a few minutes. Crankshafts should always be stored standing straight up or hanging from a storage fixture. Laying a crank on its side will cause permanent damage.


engine builder joe mondello:
Once the caps are removed, remove the
crank by lifting it straight up and setting it down standing up on it’s flexplate mounting flange. Never lay
a crank down flat for any period of time; it will become warped up to .010 to .015. Now you can examine



copied from a forum:


Even the stoutest metal will "creep" under continuous stress. This is a process where the macro metal does not see enough stress to cause permanent deformation. On a micro (atomic) level, however, distinct atomic bonds do see enough stress to cause these bonds to break and create a deformation on the atomic level. Over a period of time, these atomic level deformations add up and can be measured at the macro level.

What you have with a crank laying on its side is a relatively heavy object resting on a few points (due to the geometry of the counterweights and throws) with relatively large spans unsupported in between supports. Over time, the crank will "creep" out of shape.

IMHO, the best method to store a crank would be on the mains using v-blocks (precision machined and perfectly in line with one another). Second would be in the block assuming the block is straight and properly supported. Finally, stand it on end or hang it from the snout. I would never lay one on its side for storage unless I was planning on having it machined.

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post #5 of 35 (permalink) Old 08-15-2009, 01:19 PM
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I wonder on this one a lot. The crank is on its side resting on a few points in the block, but I suppose it is the "right" points. A new crank has what 2 chunks of foam? 1 on either end and that will not cause it to sag? I find it hard to believe a few minutes would damage it.

Still, I have always kept them in the block or standing upright.
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post #6 of 35 (permalink) Old 08-15-2009, 01:22 PM Thread Starter
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Quote:
Originally Posted by jpierce55 View Post
I wonder on this one a lot. The crank is on its side resting on a few points in the block, but I suppose it is the "right" points. A new crank has what 2 chunks of foam? 1 on either end and that will not cause it to sag? I find it hard to believe a few minutes would damage it.

Still, I have always kept them in the block or standing upright.
I would like to know also....I found some stuff as I have posted........but still no hard evidence for "any length of time"......or just a "few" minutes...but I would really like to know. I can see after a few months/etc. But just a little while seems a good debate.

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post #7 of 35 (permalink) Old 08-15-2009, 01:30 PM
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post #8 of 35 (permalink) Old 08-15-2009, 01:40 PM
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This is a good topic and I know I am curious how this will pan out. Although they say to never lay a crank on it's side, could that possibly be an attempt to keep people from getting into the habbit of leaving the crank on it'a side. If left for a long length of time I could see it distorting the crank. When I sent my block to the machine shop to get 4 bolt mains installed they had my crank ( luckily hanging from a rack ) and block for 10 months.

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post #9 of 35 (permalink) Old 08-15-2009, 01:44 PM Thread Starter
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Quote:
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Did you see the smokey yunich bit?......interesting

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post #10 of 35 (permalink) Old 08-15-2009, 01:45 PM
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I have had a crank in a box now for 10 months. Oops.

I guess I am screwed?

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post #11 of 35 (permalink) Old 08-15-2009, 01:53 PM
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Stored one in a box on its side for 10 years just pulled it out & checked Straight as an arrow.
Think about this does your crank run in your motor in a vertical position. (Standing up)

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post #12 of 35 (permalink) Old 08-15-2009, 01:56 PM
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Originally Posted by blownjet13 View Post
Stored one in a box on its side for 10 years just pulled it out & checked Straight as an arrow.
Think about this does your crank run in your motor in a vertical position. (Standing up)
But in a engine it is evenly supported along the main bearing line. Laying flat you have the counter weights in different planes.

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post #13 of 35 (permalink) Old 08-15-2009, 02:01 PM
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But in a engine it is evenly supported along the main bearing line. Laying flat you have the counter weights in different planes.
How about in a box for ten years? less than .0002 Run out .001 is industry acceptable standard.

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post #14 of 35 (permalink) Old 08-15-2009, 02:34 PM
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Quote:
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How about in a box for ten years? less than .0002 Run out .001 is industry acceptable standard.
You got lucky, there are such things you know.

I dont care if one or the other say to lay them down, old old greese monkeys said to stand them up, & thats what I'll do. I even bolt the gear back on an old used cam & stand it up.
I come from the foot hills of NC, where Nascar was formed & if it said ok to stand them by Junior Johnson or Curtis Turner, guess what I'm going to do.

On another note though, just any ol machine shop tell you to lay it down & then in the end it get bent, guess what, more money in their pocket cause you got to replace it.
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post #15 of 35 (permalink) Old 08-15-2009, 02:51 PM
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I vote for B.S.
A crank can take 2000+ psi in cylinder pressure without taking a permanent twist.

If its hanging from the flange all the weight is trying to bend it from the topmost journal intersection - or from the bottom if standing. But sitting for fifteen minutes - or fifteen years on its side is somehow gonna turn it into spagehetti.

I suspect that they are stored standing up because they take up less room that way in the shop. And the urband legend took hold from there....

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