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Allis Chalmers Discussion Forum
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mains on a b

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rick

11-09-2003 14:24:45




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how do i set the crush on these bearings? i am kind of confused




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wdtom

11-10-2003 18:40:48




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 Re: mains on a b in reply to rick, 11-09-2003 14:24:45  
Crush is the amount of gap you would havebetween the bearing cap and the block if you put the bearings toghther finger tight. You want some "crush" to make sure the bearing shells are clamped in good and tight. Look in the book and see how much the recomend. I think it is .002" or .003" , but I don't remember. It might be .0015 on each side. Anyway you need to maintain this. If you check with plastigage and the proper amount of shims to get the proper crush and you have too much clearence you have to take out shims, but you have to file the ends of the bearing shell an equal amount to maintain the crush. And they need to be filed square and even. I set up a dial indicator on a flat surface and slide the bearing shell under it (ends down) to measure how much I am taking off. It takes a while to do, don't go into it with the idea you will do it fast.

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Dick L

11-09-2003 15:36:37




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 Re: mains on a b in reply to rick, 11-09-2003 14:24:45  
Don't worry about the word crush. In this instance it just means the two halves have to meet and be tight without a gap. Not to tight that they pinch or bend out on the crank. Use plastigage and set the (clearance)space between the bearing insert in the main cap and the crankshaft. Clearance should be .015 and .002. Tourque each time you use plastigage. Get the green strips. Clean the plastigage off the bearing and crankshaft before turning the crank after checking and setting clearance.

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rick

11-10-2003 14:09:54




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 Re: Re: mains on a b in reply to Dick L, 11-09-2003 15:36:37  
thanks dick. that cleared things up for me



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