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  1. #1
    sunchaser1997's Avatar
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    Broken pump shaft anyone?

    I searched many threads, but I have not seen anyone experancing my issue. Saw a lot of misfortune, but not this one. I have managed to break the shaft that connects the impeller to the jet pump. The pump housing is now scrap along with the impeller. The drive shift is suspect too. Anyone seen this... and any idesa on WTF would have caused it?? I hate to spend the $$$ to fix this only to have it occur again..

    Any feedback is very appericated.


  2. #2
    JET250's Avatar
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    that is chit luck mate, I think you would have just had a bad batch of steel, can happen very unusual. I have spun props, smashed pumps, destroyed props, stripped the thread on a shaft but never broke one. hope its in warranty. get the thru hull bearing replaced as well.

  3. #3
    Moderator DrewNJ's Avatar
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    I broke one trying to get the prop off of a wasted pump/bearing setup. Snapped it off right at the threaded section leaving a piece inside the prop.

    What I "thinnk" was happening on this one was that the bearing let out allowing the prop to ride on the housing....tightening up as it went. I wonder if yours was doing the same???

  4. #4
    sunchaser1997's Avatar
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    When this happened, I was riding main channel of the Tennessee River, deep water, just crusing. Felt a pronounce CLUNK, followed by very heavy vibration and loss of power. Motor still running, but pretty pissed off about life. Stopped the ski, engine still running, but vibrating to shake your eye teeth out. Cut it off and got in the water and felt as far up the intake as I could, nothing in the tunnel. Ski would bearly turn over, starter was clearly in a bind. Towed it back, tore it down and found the shaft snapped.

  5. #5
    giguchan's Avatar
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    Andrew,
    is this what you and i are trying to prevent against?

  6. #6
    Moderator DrewNJ's Avatar
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    Yep, busted kawi pumps are no fun... Here are some pics from a pump I rebuilt for a very good friend.
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  7. #7
    Moderator DrewNJ's Avatar
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    And a vid just for fun...


    You can see how when the seals/bearings fail it allows the prop to ride along the ring making things super tight and damaging everthing in the process. This was also one prop that I could not get off the shaft no matter what I did (torch/PB etc etc). Ended up breaking the shaft trying to get the prop off.

  8. #8

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    This past weekend my brother in law did the same thing on his 260 on the same river. We were leaving the cove where the water fall is on pickwick. A towboat with a bunch of barges had passed and we started out thru the area he had been thru when he said the ski started viberating bad and just quit pulling. We got it tore down and found the shaft broken where it slides into the impeller. The dealer told him it would be 8 weeks before he could get his hands on another shaft. The way it broke kind of looks like it MAY have been a casting flaw, but who knows at this point.

    Sun i hate it for you , hope it doesn't take as long for you to get back on the water. Good luck

  9. #9
    I've had one shear off on a seadoo at the same area. I think in my case it was a case of old age and corrosion.
    Getting the threads out of the impeller was the hard part, so I took it to a machine shop. Mine caused little damage
    to the wear ring and I managed to drive it back 1/4 kilometer to the warf with a minor vibration at low speed. Same thing
    a snap while jumping waves and then a vibration. Funny how you instantly know you are fu#ked I replaced the shaft and changed the
    pump lubricant and it is running fine 3 years later.

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