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  1. #1
    dmp8810's Avatar
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    Exclamation 2011 rxt260 is carbon seal failure causes

    Hello everyone,

    High Priority would be great.

    Need people to help me with the following questions...



    Model:

    2011 Seadoo RXT260 IS


    Question 1:

    Can a slightly damaged impeller (marks/cracks/nicks) cause cavitation causing the carbon seal to fail and water to leak in?


    Question 2:

    How many reasons are there for a carbon seal to fail?


    As far as i know they are,

    1- flushing ski for too long (longer than 3-5min)
    2- cavitation, riding ski with intake grate clogged with debris. (longer than 3-5min)
    3- cavitation, riding ski jumping waves (longer than 3-5min)
    4- mis aligned driveshaft.
    5- damged engine mounts.


    I can not think of anymore reasons.



    Question 3:
    Are there anymore reasons for carbon seal to fail?



    Question 4:
    How many minutes does it take for carbon seal to fail during cavitation? (no water cooling the carbon seal constantly)


  2. #2
    JT jpt7779's Avatar
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    Right to the point, the most common reason with these skis is the engine is not aligned with the pump and or the thru hull fitting holding the bellows/carbon ring is not aligned with the drive shaft and engine.

    A 4" kanaflex airintake hose can interfere with the bellows causing the carbon ring to break its seal, been there done that.

    There have been countless guys with 2009 and newer T-X's with the engine out of alignment. There have been a bunch of guys with 2012 and newer T-X's withe the thru hull fitting holding the bellows/carbon ring being the culprit.

    A carbon ring that doesn't seal correctly can sink a boat in SECONDS.

    Sounds to me like you need an engine realignment and new drive line components as a minimum!

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  4. #3
    dmp8810's Avatar
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    Ok how do you know if the driveshaft is misaligned?

    So a slightly damaged impeller cant cause carbon seal failure?

    Don't have a kanaflex hose just standard seadoo one.

  5. #4
    dmp8810's Avatar
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    (this isnt my carbon seal just photo i found online)Is this correct for the carbon seal? Sealed off by the hose clamp on the bellows. So water flows up there to cool the carbon seal?Click image for larger version. 

Name:	carbon_seal_diagram_waterflow.jpg 
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  6. #5
    This is how I run a jetski shop in the desert nmpeter's Avatar
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    yes, if the pump cavitates the setup doesn't cool well., and in this image the seal fails quickly as the rear pro boot clamp isn't in place and grease will ruin the carbone ring quickly, as does the sand and such that can get in there if the hull isn't maintained well or you swamp on a sandbar.

    when the seal get hot enough either the clamps will fail or the rubber boot melts a bit and you titanic in less then 60 seconds

    crap wrapped around the driveshaft can also work it's way into the seal system and cause problems.

    For peace of mind, get the alignment checked, the carefully reassemble with oem stuff.

    I've done a few drivelines fro the local rental outfit, and I can say the system works well if properly setup and maintained.

    Grease is an enemy here..and bilge water often picks up that little bit of oil you missed at the last oil change.

    clear sign of a damaged seal is a streak that lines up with the carbon ring in the hull from contaminated water that is slinging off of it.

  7. #6
    dmp8810's Avatar
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    My driveshaft was out to have the PTO bearing and seal replaced.

    Could it be possible for the dealer to align the driveshaft incorrectly and wear the carbon ring on one side and eventually when its worn enough leak water? (causing jet ski to fill with water quickly)

  8. #7
    This is how I run a jetski shop in the desert nmpeter's Avatar
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    I'd guess the engine was out of alignment from the factory( as stated before) and that may have well caused the original failure. Get it checked. there is very little leeway in this area. Check your invoice to see if alignment was mentioned.

  9. #8
    dmp8810's Avatar
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    Sorry i didnt see in your previous post that it can be mis aligned from factory.

    Ok i just checked my 100hr service invoice.

    no where does it say anything about aligning driveshaft/driveline.

    Therefore it was not done. Correct?

  10. #9
    JT jpt7779's Avatar
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    Yes they are out of alignment from the factory, total BS but accept it and move on!

    read this thread http://www.greenhulk.net/forums/showthread.php?t=187908

    Either get the tools yourself and do it yourself or take to someone you trust to take the time and do it correctly.

    i bought the tools and loaned them out to over 10 others guys and 100% of them also found their alignment was way off. Once realigned no more drive line problems!

  11. #10

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    I'm in the process of ripping my pump shoe off as we speak. I already had the ride plate off...but when I went to align the engine the shaft kept sitting to low no matter what I did from zero through a bunch of shims in every combination. So off it comes. You can take your intake grate off and run your finger around the shaft and see if seemed center going into the ski. You'll still want to check it with the tool but at the end of the day the shaft needs to be centered going through the hull.

    MY SKI HATES ME

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