JayBee
06-01-2003, 06:42 PM
Ok, so I was just starting to look at cutting my A down to a B using the diagram in the Seloc manual. First thing I noticed is the Seloc manual shows the cut angle to be measured from a line parallel to the centerline of the shaft. When I looked at my impeller it was obvious that the actual machined angle was the compliment (90-the angle). So, I went to the Berkeley site (Berkeley Size Diagram (http://www.berkeleyjet.com/products/249.asp)) and sure enough they have the same angles only they show it from a line perpendicular to the shaft centerline. So, I guess the Seloc manual has a slight error!
Ok, next problem. Mine is an A, but the angle measures about 63 degrees as opposed to the 60 that Berkeley lists. The large and small diameters are right on, though... That made me start looking at the other sizes and I noticed something else that I cannot figure out. How can the angles change from A2 through C in the following sequence - A2=57.5, A=60, B=56.5, C=56.5 if the large diameter is the same and the small diameter is getting progressively smaller??? Am I missing something here?
Any info from people who have cut their own impellers would be appreciated!
Jason
PS - I am glad I tore the pump apart. When I bought the boat I was told it had just been blueprinted and rebuilt by an expert somewhere in LA. Well, the thrust bearing's front balls are all pitted heavily. I had an awful time getting the impeller off the shaft - probably because there was Loctite the whole way through the impeller bore. And there was obviously no blueprinting done, but there is a nice coat of paint on the impeller! Also, there were very visible polishing marks on the end of the shaft that goes into the bowl bearing, so it hadn't been run long.
Ok, next problem. Mine is an A, but the angle measures about 63 degrees as opposed to the 60 that Berkeley lists. The large and small diameters are right on, though... That made me start looking at the other sizes and I noticed something else that I cannot figure out. How can the angles change from A2 through C in the following sequence - A2=57.5, A=60, B=56.5, C=56.5 if the large diameter is the same and the small diameter is getting progressively smaller??? Am I missing something here?
Any info from people who have cut their own impellers would be appreciated!
Jason
PS - I am glad I tore the pump apart. When I bought the boat I was told it had just been blueprinted and rebuilt by an expert somewhere in LA. Well, the thrust bearing's front balls are all pitted heavily. I had an awful time getting the impeller off the shaft - probably because there was Loctite the whole way through the impeller bore. And there was obviously no blueprinting done, but there is a nice coat of paint on the impeller! Also, there were very visible polishing marks on the end of the shaft that goes into the bowl bearing, so it hadn't been run long.