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Allis Chalmers Discussion Forum
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Some Pix

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DickL

08-17-2009 18:31:16




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Here is a way to check to see how much the bearing inserts need filed or if they do and how much.
When you took your engine apart you probly had shims like these under the main bearing caps measuring .002.

third party image

You need .015 to .002 clearance and about .001 crush or bearing insert pinch at the ends of the inserts. If you have much more the inserts tend to push in toward the journal and drag.
Placing two of the shims on the crankshaft after oiling the inserts and crankshaft journal I pinched the two halves for the front main together and rotated the inserts with the two inserts and could not feel any drag. That means I had at least .004 clearance without crush. I added the third .002 shim which would make .006 and when I tried to rotate it it was tight.
Without a mic it told me that the hand pinch tight bearing inserts had between .004 and .006 clearance. This tells me I need to file .002 or .001 off the end of both halves if this actually works.
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third party image

To prove out the accuracy of this method I do have the proper instruments.

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third party image
The measurments came out to .005 clearance which told me I needed to file .001 off one side of each bearing insert.

I was able to do this with a snippet of .001 shim stock. I laid the shim stock at the edge of the insert on the bearing cap making sure they were even by passing the tip of my finger across both.
third party image
third party image

Using the bearing cap as a gage filing until smooth.
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I will repete this on each journal before installing the bearings and dropping in the crankshaft.
They are most likely all the same and each main need the same filed off but why take the chance. Just one more (detail) that you might skip and not have a problem but on the other hand I would have on this journal.

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