In the past two weeks I have burned two of those fans and I have had to learn how they work. The unsealed bearing was original and will last a lifetime if properly maintained. It uses centrifugal force to keep the oil in the hub with a pump at the north end to circulate the oil through the bearing. If the oil gets too low, the pump can't pick it up. The bearing is rather simple being just a shaft through a casting. You can't overfill since too much oil will simply flow out the unsealed end when the engine is not running. I would use somewhere between 45 and 90 W and fill till it runs out the south end. I did install one of the new sealed bearing types. Personally I do not believe they are as good as the originals.
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Today's Featured Article - Restoration Story: 1929 McCormick-Deering 10-20 - by Randal Simmon. On July 4th 1998 my dad and I was sitting on the front porch when he said that he was going to sell his two 10-20's to a junk man. He said that the junk man was going to give him $500 for both of them but he hadn't received the money for them yet. So I went into the house and wrote him a check for $500 and bought them myself and said now they are mine. He had bought them about five years before thinking that he was going to restore them himself. After five years sitting in the barn, he changed h
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