SoCal Jet Boats
Tech Talk => Jet Pumps => Topic started by: iloveitloud on May 12, 2013, 09:30:33 AM
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I finally tore apart my 84 berk JF pump! I'm doing an impeller/wear ring, bushings and seals...not front bearing at this time. Impeller front edges were OK, rear edges were bent, cracked, and one had a decent size piece missing. The leading edges of the bowl vanes are nicked up a little, but no big dings, or chunks missing. My question is "how should I file them?" I have seen some people put a "flat" edge on them, but I thought I would just "take out the nicks" so the edges were smooth, and leave the basic rounded vane edges the way they are. For the most part, the vanes are not too bad compared to pics or others I have seen...I just want to dress them up, but not screw up anything! I cannot post pics, but mabe a pick of what a used, cleaned up, bowl should look like would be helpfull. Thanks in advance!
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Also on this...The vanes have a pretty "ruff" surface finish -from casting. Should I smooth and polish as much of that "ruffness" as I can get to? or is it not worth the time?
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My .02, smooth it all out but leave the roundness. Possibly put on a knife edge on the leading edges but a slightly rounded vane will flow better thanks to the coanda effect. Same reason why airplanes can fly etc...