Re: More crank bearings

Posted by Aces on January 12, 2005 at 08:31:41 from (65.54.97.145):

In Reply to: More crank bearings posted by CNKS on January 11, 2005 at 18:19:12:

CNKS You should do the plastic gage with the shaft and bearing dry because you are trying to find the clearence between the bearing and shaft. And I would gage the old bearings to get and idea how bad the wear is. New bearings of the same size should never give a larger gap. One should never assume the bearing in the box is what the box says, check the bearing to see it is marked as what one wants. Part of the confusion here is that you can not put over size bearings in and engine, if the shaft is warn and and different bearings are needed you put in under size bearings. Say you have a 2" shaft, first you will have standard bearings, then IH had .002 under size, in some cases they had .003 under size. If .003 under size don't do the job you have the shaft ground. So if the shaft is ground you take off material you don't add, so now the shaft is 1.990" if you need to go .020 then the shaft is 1.980 under the orignal 2", so we put in under size bearings not over size, because it is the diameter of the shaft that determons the size of the shaft, the bearing does not determon the size of the shaft. So we have standard and under size bearings.
The best way in an old engine to determon the condision of the shaft is with a micrometer it will tell you if the shaft is out or round with out needing to know the diameter of the shaft. To know if the shaft has been ground you will need to know the original size.
Hope this is some help.

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• Re: More crank bearings CNKS 12:31:40 01/12/05 (0)

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