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  1. #1
    rick xp's Avatar
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    Problems with TBM Pump Cone??

    Hi guys,

    I installed a TBM pump cone in to my ski last week and pulled my pump apart last night and the front of the cone has been worn away from the prop.

    It looks like the shaft has moved back and machined the front of my cone away.

    At the moment there is about a 4mm gap between the back of the prop and the cone.

    I used the supplied spacer from TBM and double checked the clearance and it was all perfect. 40thou is recommended by TBM and this was correct.

    Can these shafts move back at all??

    What stops the shaft from moving backwards?

    I heard there is nothing stopping the shaft from moving backwards and it just presses out.

    I think maybe whats happening is when chop the throttle at 85+ the prop speed goes down to 1500 RPM but there is still 80mph of water going through it and therefore pushing the shaft and prop back but when you accelerate the shaft pulls forward again.

    anybody seen this?


  2. #2
    mjh3ides's Avatar
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    If you are using a Skat prop they have a thicker spacer available to prevent what happened to you. If you don't specify which spacer you need I think they give you the one that only works with the stock or Solas impellers. The spacers they provide are made of 316 stainless so they shouldn't be getting crushed & allowing the impeller to walk back.

  3. #3
    rick xp's Avatar
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    I used the correct spacer and checked clearances and they were perfect.

  4. #4

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    You'd be unlucky for the shaft to move on the pump bearings (inner or outers) . It usually takes a 10tonne press to push them out.

    Not sure what would have caused that one.

    Plus if you had used the wrong washer for the skat prop it wouldn't move at all. Just jammed right on.

    ...........a bit of crap caught up in there maybe????

  5. #5
    rick xp's Avatar
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    Ok have talked to a few local people and have exactly the same thing happen to theirs.

    Seems like the alloy on the TBM cone is not big enough and could be starting to flare under extreme pump pressure.

    The shaft def does not move and i believe the fault is with the cone.

  6. #6

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    Got any pics Rick?

  7. #7
    rick xp's Avatar
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    Yeah mate will put some up tonight. Its just the front of the cone has pretty much been machined away.

    Guess what though - I removed the cone and RPM's did not change at all and cav was the same but i gained at least 1 MPH with the stock cone.

    I wont be putting it back on thats for sure.

  8. #8
    RichieFZR's Avatar
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    Quote Originally Posted by rick xp View Post
    Yeah mate will put some up tonight. Its just the front of the cone has pretty much been machined away.

    Guess what though - I removed the cone and RPM's did not change at all and cav was the same but i gained at least 1 MPH with the stock cone.

    I wont be putting it back on thats for sure.
    +1 PoW!

  9. #9

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    Can you post some pics of this?

  10. #10

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    Quote Originally Posted by rick xp View Post
    Yeah mate will put some up tonight. Its just the front of the cone has pretty much been machined away.

    Guess what though - I removed the cone and RPM's did not change at all and cav was the same but i gained at least 1 MPH with the stock cone.

    I wont be putting it back on thats for sure.
    So your gunna start tuning the motec's positional translation table? Or do you have another plan with the hardware?

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