Took my pump apart.
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Took my pump apart.

  1. #1
    460
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    Default Took my pump apart.

    And here is what i found.

    What causes the veins on the bowl to do that? From the pics you can see there isnt any major damage to the impeller. The edges need to be cleaned up but the impeller is in great shape. I started to have sum cavatation towards the end of the season and was certian the impeller was shot. Would the bowl being in the shape it is cause the cavatation? Checked my impeller to wear ring clearence and was expecting it to be way off. When we set the pump up we went with .0031 and its now at .0037. First time using the ULTIMATE WEAR RING, so i have no idea if losing .006 over three seasons is normal. I would think its ok, but in this game u never know.

    Any ideas?
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  2. #2
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    i'm no pump expect, but, it appears that the impeller has seen "alot" of rocks, sand etc from running in low water or beaching the boat!!
    my original impeller looked like that & the whole inside of the pump was full of sand & rocks. it had to be really cleaned up in order to make it rite again...i say, clean up the impeller (sharp edges) & stay out of the sand & rocks!...just my .02 cents

    FastRat

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    JRPM/e-PerformanceMarine Squirtin Thunder's Avatar
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    Quote Originally Posted by FastRat View Post
    i'm no pump expect, but, it appears that the impeller has seen "alot" of rocks, sand etc from running in low water or beaching the boat!!
    my original impeller looked like that & the whole inside of the pump was full of sand & rocks. it had to be really cleaned up in order to make it rite again...i say, clean up the impeller (sharp edges) & stay out of the sand & rocks!...just my .02 cents

    FastRat

    Yep !
    I have been abusing mine for 4 or 5 seasons of racing, towing and family fun and it is perfect.
    Jim & Amanda Rich
    CJ 72 & 53c

    JR Performance Motorsports

  4. #4
    460
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    Ok, stay away from rocks


    Guess thats the moral of this story

  5. #5
    mo balls than $cents$ IMPATIENT 1's Avatar
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    Quote Originally Posted by Fo Sitty View Post
    And here is what i found.

    What causes the veins on the bowl to do that? From the pics you can see there isnt any major damage to the impeller. The edges need to be cleaned up but the impeller is in great shape. I started to have sum cavatation towards the end of the season and was certian the impeller was shot. Would the bowl being in the shape it is cause the cavatation? Checked my impeller to wear ring clearence and was expecting it to be way off. When we set the pump up we went with .0031 and its now at .0037. First time using the ULTIMATE WEAR RING, so i have no idea if losing .006 over three seasons is normal. I would think its ok, but in this game u never know.

    Any ideas?
    find a newer style dom bowl. your bowl is causing cav, peeps don't think of that area enough imo when setting up a pump.
    btw, a uwr hooks up realllly well with only 5 clearence up frt don't be a sissy

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    Quote Originally Posted by Fo Sitty View Post
    And here is what i found.

    What causes the veins on the bowl to do that? From the pics you can see there isnt any major damage to the impeller. The edges need to be cleaned up but the impeller is in great shape. I started to have sum cavatation towards the end of the season and was certian the impeller was shot. Would the bowl being in the shape it is cause the cavatation? Checked my impeller to wear ring clearence and was expecting it to be way off. When we set the pump up we went with .0031 and its now at .0037. First time using the ULTIMATE WEAR RING, so i have no idea if losing .006 over three seasons is normal. I would think its ok, but in this game u never know.

    Any ideas?
    Your biggest problem is the leading edges of your impeller are hammered from gravel being pumped through the jet-drive.

    Next is your clearances. I think you meant that you guys set it up at .031 not .0031 and your now at .037. That is getting pretty loose.

    You don't need a new bowl but it does need some attention and your seal appears to be missing? Get one in there.
    B1Racing.net

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    Quote Originally Posted by cs19 View Post
    Your biggest problem is the leading edges of your impeller are hammered from gravel being pumped through the jet-drive.

    Next is your clearances. I think you meant that you guys set it up at .031 not .0031 and your now at .037. That is getting pretty loose.

    You don't need a new bowl but it does need some attention and your seal appears to be missing? Get one in there.
    A local guy here( not naming names) said he water cooled my bowl. For as long as i can remember there hasnt been a seal in there.

    And yes thats what i ment

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    Quote Originally Posted by Fo Sitty View Post
    A local guy here( not naming names) said he water cooled my bowl. For as long as i can remember there hasnt been a seal in there.

    And yes thats what i ment
    The bowl may be water cooled but there is no reason to not run the seal for keeping sand out of the bushings.
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    Quote Originally Posted by cs19 View Post
    The bowl may be water cooled but there is no reason to not run the seal for keeping sand out of the bushings.
    I see. I never even thought to ask.


    As for the clearence.

    When we set the pump up we had to put 1 thou in shims to get .031 between the ring and impeller. Taking shims away from that 1 thou will tighten up the clearence correct?

  10. #10
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    Quote Originally Posted by Fo Sitty View Post
    I see. I never even thought to ask.


    As for the clearence.

    When we set the pump up we had to put 1 thou in shims to get .031 between the ring and impeller. Taking shims away from that 1 thou will tighten up the clearence correct?
    sure will mine was way tighter than that like .025

  11. #11
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    Quote Originally Posted by Fo Sitty View Post
    I see. I never even thought to ask.


    As for the clearence.

    When we set the pump up we had to put 1 thou in shims to get .031 between the ring and impeller. Taking shims away from that 1 thou will tighten up the clearence correct?
    take that shim out and measure it, subtract the difference from 31 and if its above 15 and below 25

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    Quote Originally Posted by IMPATIENT 1 View Post
    take that shim out and measure it, subtract the difference from 31 and if its above 15 and below 25
    Im going threw my memory and there was a couple different size shims we used to get that 1 thou.

    Guess im doing sum playing around this weekend

  13. #13
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    The leading edge of the impeller blades is likely your biggest issue, second would be the clearance on the W/R. You will likely not notice much on the bowl vanes, although cleaning them up won't hurt a bit. If you want a bang for the buck get the back side of your impeller detailed, you will be amazed how hard it will hit.

  14. #14
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    I thought you were at .037 on the wear ring to impeller radial clearance not front clearance, that .037 on the radial would be getting on the big size of things. If your at .037 on the front clearance with your UWR that is also too large and can be tightened up by removing shims, if you were running this on a bronze or stainless wear ring then that .037 would be a good starting point. Talk to Duane about where your front clearance should be using his wear ring.
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