Posted by Owen Aaland on March 11, 2010 at 02:02:02 from (65.161.86.87):
In Reply to: H Crankshaft posted by badger bob on March 08, 2010 at 17:53:38:
CenTex Farmall said: (quoted from post at 23:04:20 03/10/10) May be a little late for a reply, but here goes.
Do NOT do the shim stock thing. The little tangs on bearings only help locate them left and right in the rod or main. They do NOT keep bearing from spinning if something goes wrong.
The OD of the bearing shells put together is slightly large than the ID of the rod bore. This is called "Crush" and is what keeps the bearings in place.
The tangs on the bearings are absolutely necessary to keep the inserts from turning in the block. In fact, many IH engines have the tang opposite rather than matching so that both tangs act to keep the inserts from turning.
The crush is the reason you need to take about .008" off the end of each insert. If you have .010" smaller diameter, the circumference is .03159" smaller. 4 X .008" = .032" is within .001" of specs.
You also have to provide a hole in the upper shim to allow oil to get to the bearing.
As I posted before, this is certainly less than an ideal situation, but done correctly, it will work.
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