EM Iowa said: (quoted from post at 08:43:22 05/19/13) I have the motor disassembled, and now I'm left with having to decide whether or not to replace the crankshaft ball-bearings. There are some small pits an the balls and they make a low growl noise. But don't they usually sound like that when they're new also?
I've located the same sizes in metric online. About $170 for the front and rear bearings.
What's your opinion? Could I also find the ball-bearings at a auto store?
You should replace them, not only because of the rust pits but also because they have many years of wear and I bet they are as loose as a goose. Yes, new bearings make a little noise when they are dry, but add a little oil or grease and they are almost silent. I put new bearings in the pre 1939 IHC engines that I rebuild. I get new metric ball bearings off of ebay, much cheaper than anywhere else. 6313 is the number for the front bearing and 6315 for the rear.
Here are some bearings, they are shielded or sealed, just pry out the seals and then press them on the crankshaft.
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