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Thread: Carbon seal

  1. #1
    actis's Avatar
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    Carbon seal

    whats the purpose for the carbon seal? i thought it was to water tight the drive shaft but there is no way it could do that because of the slop movement on the shaft. the shaft is smaller diameter than the carbon seal. i posted this in the sport boat section but had no responses. any help?


  2. #2
    Depth's Avatar
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    Well on the seadoos it doesn't seal on the shaft it seals on the "hat" is threaded on the shaft, the face of the "hat" is held by spring pressure of the boot against the carbon seal. Ultimately it's not a prefect seal but when it's all tight and new it works.

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    actis's Avatar
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    ok so, if your ski was in the water and you compressed the boot. water would leak in because the carbon seal isnt resting flush with the hat. right? is 130 hours on the original carbon seal a lot? i've got about five gallons of water i drain from my speedster 200 jet boat after a full day of riding. i was thinking the carbon seals were leaking because i can't find any other source of a leak.

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    stuckmoto's Avatar
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    130 is a lot. Its prob due for a change. Also don't run out of water too long(even on a hose) because the carbon ring needs water to stay cool. <2 min.

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    wotxxxsd's Avatar
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    You should have an electric Bilge on your boat also...

  6. #6
    Depth's Avatar
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    Yeah I'd change the carbon seal and probably the boot at the same time, it's not too expensive I think the carbon seal was about $30 when I did mine a couple of months ago and the boot shouldn't be much more than that

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    Moderator Snoman's Avatar
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    At 130 hours im sure its due time for a replacement...When replacing the seal also replace the accordian boot,Hat, and C-clip....Also check the groove in the drive shaft were the C-clip rides for excessive wear...

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  9. #8
    Got Boost? psycho rxp's Avatar
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    Wouldn't hurt to replace the rubber driveshaft end plug while its out, too

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  11. #9
    actis's Avatar
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    Just ordered the ring,boot, hat, all o-rings, and rubber tip at the end of the shaft. Will I need to re-align the drive shafts? Also, the driveshaft looks pitted and rusty from where it exits the hull to the impeller. I think the previous owner ran in salt water. Should I replace the drive shafts? I have a shop manual but its very vague. Just says" inspect for wear." Thanks for the help in advance.

  12. #10
    stuckmoto's Avatar
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    Quote Originally Posted by actis View Post
    Just ordered the ring,boot, hat, all o-rings, and rubber tip at the end of the shaft. Will I need to re-align the drive shafts? Also, the driveshaft looks pitted and rusty from where it exits the hull to the impeller. I think the previous owner ran in salt water. Should I replace the drive shafts? I have a shop manual but its very vague. Just says" inspect for wear." Thanks for the help in advance.
    It's normal to have corrosion in that area. Huge pits are another thing. I have an alignment tool if you get in a pinch. Where in Maryland are you? I'm the first exit off De. Mem. Bridge.

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