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  1. #1
    PolarisNut's Avatar
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    WTB: Long pump hardened driveshaft

    Anybody out there have a hardened driveshaft for an SLX/SLTX in good shape? Also a hardened stub shaft (is the MSX one heavier duty?). I keep having driveline issues where the through hull fittings and clamps keep coming loose and I think its driveshaft whip thats causing it. Also, the impellers seem to be wearing more than usual, probably from the stub shaft flexing. Only happens when the motor turns over 7300. As long as I keep it below that, it seems fine. Talked to a few guys and they said that a hardened shaft is the answer.


  2. #2
    ph2ocraft's Avatar
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    I had the same issue with my trippple piped SLTX, shaft solved the problem.
    It's amazing a little rotational whip can cause an issue.
    Let me ckeck my stash, do you have the length?

  3. #3

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    24 3/8 i think

  4. #4
    Rasta Mon Condoms We Be Jammin!!!!! TxVirageTx's Avatar
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    aha!!!!

    i just thought i was ahving an issue all my own.the seal carrier slowly keeps turning no matter what i do.ck if you have 2 al????

  5. #5
    PolarisNut's Avatar
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    Quote Originally Posted by TxPro1200 View Post
    i just thought i was ahving an issue all my own.the seal carrier slowly keeps turning no matter what i do.ck if you have 2 al????
    EXACTLY what is happening to mine...Almost sunk the damn ski the other day. Couldn't figure out why it was so boggy...looked for a stream out of the bilge pump and sure enough. Opened the rear seat and there was at least 4" in there. If i can't get a hardened long shaft, I may change to the short shaft and reverse the stator and extension.

    24.375" long Al

  6. #6
    Rasta Mon Condoms We Be Jammin!!!!! TxVirageTx's Avatar
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    ??

    what about machining the thru hull fittings out of aluminum??

  7. #7
    ph2ocraft's Avatar
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    I'll check this morning guys.

  8. #8
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by TxPro1200 View Post
    what about machining the thru hull fittings out of aluminum??
    You mean re-engineering the through-hull bearing to actually keep the drive shaft centered, and limit the shaft whip at high RPM?

    You would then have three fixed bearing points along a solid shaft - impeller, engine PTO coupler, and the through-hull. Would need to accommodate engine motion on the engine mounts (which I guess is exactly what the current through-hull bearing does).

    That rubber hose mounted through-hull bearing seems designed to just follow the shaft motions, and keep the seals positioned on the shaft, but not hold the shaft in place.

    Is it possible your drive shaft is not going through the exact center of the plastic mount for the bearing, and normal shaft motion is contacting the inside of the mount?

    Perhaps you could adapt the MSX through-hull bearing assembly to mount in the older hulls?
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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  9. #9
    PolarisNut's Avatar
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    Bottom line is that the current driveshafts were designed back when the 780 was out and had 90hp and turned ~6000 rpm...now we're dealing with 175 hp and 7500rpm...the shaft is flat out too small in diameter. If it were bigger, it wouldn't need to be supported in the middle.

    Al-we're counting on you good buddy My ox is in a ditch.

  10. #10
    ph2ocraft's Avatar
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    Nope, I only have a PRO785 shaft left.
    I know I purchased one from Randy a couple of years ago, I must have sold it.
    Kevin has one, we need to beat it out of him.

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