Posted by MarkOhio on March 30, 2008 at 20:44:10 from (67.54.207.209):
In Reply to: Bearings posted by Lanse on March 30, 2008 at 18:30:35:
Lanse, like El Toro said, what do the main bearing journals on the crankshaft look like? The proper way to measure main bearing wear is BEFORE you remove the bearing inserts from the block. It takes some special measuring equipment that you probably don't have. The main bearing caps have to be reinstalled and torqued on the block with the crank removed. Then with an inside micrometer, or "snap' gauges and an outside micrometer measure the inside diameter of the bearings in several places. Then measure the crankshaft journal diameter. Subtract the 2 measurements (Bearing measurement will be bigger than the crank diameter) The difference will be the running clearance. Generally in the range of .0015 to .0025 or so. Check your overhaul manual. To remove the bearings they just sort of rotate out of the block. One side will have a little "tang" that sort of fits into a notch in the block. Gently push on the other end of the bearing until it pops out of the block. Clean the back off and it should be stamped on the back of the bearing with a part number and either "std" or +.010, +.020, etc. A - number means that the crank has been reground to that size sometime before. (Crank -.010, bearings +.010) This is of course assuming that that your engine does have replaceable inserts. If they're poured babbet bearings they aren't removable and you'll have to find someplace that is willing and able to work on them. Incidentally, I'm not too far from where you live. I'm near Middletown so if you have any problems my email is open.
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