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Allis Chalmers Discussion Forum
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shims

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mike schoff

08-06-2007 09:46:46




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I have a allis chalmers c model and I need to now about rod shims. I have 0.20 bearings and the crank is turned 1.961 the guy I bought the enigne from had 0.10 shims in it but it would not turn can anyone help thank you.




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wdTom

08-06-2007 17:32:32




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 Re: shims in reply to mike schoff, 08-06-2007 09:46:46  
There is more to this than has been mentioned so far. The bearing shells need to be a "press fit". To get this you put the bearing shells in the rod, or main bearing and put the cap on finger tight, now measure the gap between the cap and rod or block. Now your shim pack should be (check the book on this, I don't remember for sure) .002 less than this gap. I don't remember for sure but I think this is total, or .001 on each side. Now put plasti gauge in the bearing and put it together and torque it up pretty good, check your plasti gauge. If you need to reduce the clearance you file the insert ends by the amount you need to get the proper clearance, and reduce the shim pack an equal amount. To file the insert lay a file on the bench and carefully place the insert on it, ends down and slowly and carefully file it. To see how much you have filed I use a dial indicator on a flat surface and slide the insert back and fourth under it before filing and as it is being filed. When the dial indicator shows the height of the dome of the bearing has fallen the proper amount you are there. File equally end to end on the bearing so it will tighten up equally when you torque it up. Don't go all at once, sneak up on it slowly and gradually, it is slower but you can not "file more back on" if you take off too much, you can file more off if you need to. This isn't a fast process, you might want to do it over several sessions. You can make shims out of any sheet metal, or shim stock you buy. I wouldn't use aluminum, but steel and brass are fine. The stock ones are brass. Just take it slow and easy, and pay attention to what is going on. Read the manuals.

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Texas Denny

08-06-2007 15:31:41




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 Re: shims in reply to mike schoff, 08-06-2007 09:46:46  
By 0.20 bearings, I think you mean 0.020" under. Not sure about the measurement of 1.961" as stock is 1.938" (0.023" difference). So I don't know about your numbers.

To put this crankshaft together, you need to use plasti-gauge to get the correct clearance. It is explained in the IT manual or the Allis repair manual. The shims you use for the rod caps should be 0.001 or 0.002. You could not use 0.10 shims. As you do each bearing, check to see that the crank turns freely. If it doesn't, you need to plasti-gauge again on the last bearing that you did.

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