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  1. #1
    Elityler's Avatar
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    Rear pump bearing float

    I have my pump apart on a 250x trying to find a slight strange noise. I know the rear bearing is designed to float but at what point is it too much? I can't seam to find any info in the SM on this. For every revolution the inner ring turns the outer spins half a turn. Like a 1-.5 ratio. This has caused a small ridge from wear, where the bearing sets. It's mane .001-.002

    Is this ok?

    I'm worked it's going to get worse, or misalign the impeller.


  2. #2
    nicjak's Avatar
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    its fine the rear cone slightly rests against it if you are concerned use some loctite

  3. #3
    The cone does not contact the bearing outer race. I measured mine and there is a sizeable space. Other people had the same condition as me. Mine is in with loctite sleeve retainer, we'll see this summer if it causes other issues. I had half a thou wear before making the decision to secure the bearing from skidding in the pump housing. Maybe the POS can't handle a precision fitted bearing

    rt

    Those are your words below nicjak.
    "when you dry fit with pushing the bearing to the lip and installing the cone the cone will not reach the bearing".

  4. #4
    UltraKvz's Avatar
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    Agree with RT. Mine had a sizeable space too. That and the shaft were a loose fit on the front bearings causing a hammer-effect. Could that be one of the reasons why some ski's impellers came loose?

  5. #5
    Elityler's Avatar
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    I found that it was my front bearing that were misaligning the shaft as my other thread described. when I put it back together I think I'll use some blue loctite to ease my mind.

  6. #6
    UltraKvz's Avatar
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    .....front bearing...or bearings? Dual front bearings a must!

    Quote Originally Posted by Elityler View Post
    I found that it was my front bearing that were misaligning the shaft as my other thread described. when I put it back together I think I'll use some blue loctite to ease my mind.

  7. #7
    Elityler's Avatar
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    Quote Originally Posted by UltraKvz View Post
    .....front bearing...or bearings? Dual front bearings a must!
    Yes, both bearing started to fail at less then 20HR

  8. #8
    UltraKvz's Avatar
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    Lucky you checked! I'm running 2 angled thrust bearings in oil and so far so good. NOT FOR REC RIDING AND NOT IF YOU DON'T KNOW WHAT YOUR DOING! There's accurate shimming and seating involved so I check for play after every race.

    Quote Originally Posted by Elityler View Post
    Yes, both bearing started to fail at less then 20HR

  9. #9
    Take the time to smile sirbreaksalot's Avatar
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    Quote Originally Posted by Elityler View Post
    Yes, both bearing started to fail at less then 20HR
    what have you determined as the CAUSE of the premature failure ??

    when u say both do u mean both FRONT
    or both as in front & rear ?

    Waz

  10. #10
    Elityler's Avatar
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    Quote Originally Posted by sirbreaksalot View Post
    what have you determined as the CAUSE of the premature failure ??

    when u say both do u mean both FRONT
    or both as in front & rear ?

    Waz
    Both as in the two front. When I took the pump to the dealer to have the bearings pressed out I asked for them to save em so I could see what went wrong. All the grease inside was rusty and there was actually water inside.

    When I first did the double bearing mod I replaced all three seals, the O-Ring on the shaft and the Bushing that goes in front of the two bearings. My guess Is the tech putting it back together didn't pack the seals with grease enough, or at all. This time I asked to pack the shit out of it.

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