Fan noise

Posted by Larry Jenkins on April 23, 1997 at 20:21:17

I have a 4 blade fan attached to a stainless Model B water pump shaft that makes a "knocking" sound when running.The amplitude of the knocking varies with engine speed.Also, the pully end of the fan is not running concentric with the shaft, but the nut end of the fan is, because it is attached to the end of the pump shaft.Other words, the fan 'wobbles".Could this be causing the sounds I hear?If so, what do you think is the cause?Yeah, strange stuff.Maybe I'm just getting old and losing my hearing.OK, Bobs and Rick..Don't laugh too hard..

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