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  1. #1
    Race, wreck, repeat delagem's Avatar
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    Ever repair an impeller?

    I was playing with my pumps during the motor alignment, and I found all this porousness on one of the blades:




    Now, being the cheap SOB that I am, I decided to play with my die grinder and clean this up a little. I ground it down, and then used a dremel to polish it up a little:




    So now I have a few questions:

    1. Was I just wasting my time?
    b. This is caused by cavitation, right?
    III. What's the difference between a 3-5 and a 4-5?
    D. Why do I bother with this stuff, anyways?
    Last edited by delagem; 02-05-2007 at 01:49 PM. Reason: layout looks goofy


  2. #2
    ph2ocraft's Avatar
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    Quote Originally Posted by delagem View Post
    I was playing with my pumps during the motor alignment, and I found all this porousness on one of the blades:

    Now, being the cheap SOB that I am, I decided to play with my die grinder and clean this up a little. I ground it down, and then used a dremel to polish it up a little:


    1. Was I just wasting my time? It's never a waste of time as you're going to get some great opinions and we will ALL get learn from it.
    b. This is caused by cavitation, right? Exactamoondo
    III. What's the difference between a 3-5 and a 4-5? ??
    D. Why do I bother with this stuff, anyways? Because you're sick like the rest of us. LOL
    .

  3. #3
    Race, wreck, repeat delagem's Avatar
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    Ok, I'm guessing by your question marks that the markings on these props is unusual. I thought so too. One prop says "3-5" and "POLARIS" and the other says "4-5" and "POLARIS". I assumed one was a 13-15 and the other a 14-15. No noticeable difference between the two when riding, except the 3-5 has a bit of a ding on one blade, and gave 1.0mph less top speed by GPS.

  4. #4
    Race, wreck, repeat delagem's Avatar
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    Ok, here's a pic of the 3-5 and Polaris on the impeller:




    Since I'm on the subject of impellers, how do you repair a ding like this one?


  5. #5
    ph2ocraft's Avatar
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    I don't ever remember seeing those markings like that, I'll have to go check some impellers. LOL
    As far as the damage I've always taken the easy way out and sent them to Dave at Impros.........

  6. #6
    Moderator beerdart's Avatar
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    Are these for the small 146mm 650 pump?

  7. #7
    Water Bum Rodneyae's Avatar
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    My stock 650 has the same stressed place in the impeller as yours.

  8. #8
    Race, wreck, repeat delagem's Avatar
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    Yes, these are for the small, original pump on the '92 SL650. I thought they were both the same, one came with my ski. That machine was killed the same year it was bought new, and abandoned in the weeds, so I thought it was original. The other came from a big pile of parts in the weeds out behind my local bike shop. Had to battle bees, mud wasps, and hornets to get it! They love those old Polaris hulls... Oh, there's one of those dry pipes I keep reading about there, as well... But I'd have to evict the chipmunk, and didn't have the heart!

  9. #9
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    We need to get you a 148mm pump, short or long with an aftermarket impeller. The one you have currently is a straight pitch, the laters are a variable. (much better) Cavitation will cause impeller damage. And it has been said before to remove the pump shoe from the ski and resilicone it back on because the factory install wasn't always the best. One final thought, if you don't have a dry pipe currently on your ski, evict the little rodent, and put that bad boy on. It's probably the good "short" pipe and will help on top end.

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