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  1. #1
    Stockrxp's Avatar
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    Rad 4 Thru-hull carbon seal replacement

    http://www.skimd.co.nz/shop.php?content_id=100

    Anyone having good or bad luck with these? they have been out a few years now
    Also is this the one place that sells them?


  2. #2
    Moderator Snoman's Avatar
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    These seals are the kiss of death to your ski...MANY have ran them and sank their skis with these type of seals..Very high maintenance and a Very good chance it will sink your ski....Best bet???Stick with your OEM carbon seal...

  3. #3
    Stockrxp's Avatar
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    so just greasing it will be not all maintainance that is involved? maby buy one of these to go along with it?

    http://cgi.ebay.com/ebaymotors/TWO-M...5fPartsQ5fGear



    Trying to solve some cavitation issues that i think are carbon seal related

  4. #4
    Moderator Snoman's Avatar
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    Quote Originally Posted by Stockrxp View Post
    so just greasing it will be not all maintainance that is involved?

    NO, you have to have the driveshaft cut too...Once you have the assembly together then yes you have to grease it,BUT you cannot grease it to much or to little..These seals are VERY tempermental...


    maby buy one of these to go along with it?

    http://cgi.ebay.com/ebaymotors/TWO-M...5fPartsQ5fGear

    Exactly!!!!!Maybe get two for a spare,cause your gonna need it..LOL

    Trying to solve some cavitation issues that i think are carbon seal related

    What we have found here in the States with the Rad 4 bearing carrier is that the bearing is Rockwell hardened to a specific degree..Our driveshafts are not Rockwell hardened and are of softer rating than the bearing..with this the bearing being harder eats into the softer metal of the driveshaft causing it to be pulled and twisted off resulting in a sunk ski....Now some have turned their driveshafts down more and pressed a hardened sleeve on there BUT that,IMO,is way to much work to justify running these seals...

    As far as your cavatation??As long as you run a carbon seal setup you will have some sort of cavatation...You can try to replace the seal and boot as the accordian boot looses some tention over time..and you can also put 2 rubber O-rings into the bellow of the boot to help it from compressing back under acceleration..Check out the last half of this thread..it explains how to with the rubber O-rings:

    http://www.greenhulk.net/forums/show...n-pitch-guru-s

  5. #5
    ou812's Avatar
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    It happens when you least expect it.... Just put some O rings on the carbon seal and be happy..LOL
    Not long after this video of me sinking, a paddle boarder shot some video of sharks in that same area.
    I'm uploading the "RAW .mov" clip to youtube because on Vimeo I used the .2nd gen .wmv source. I'll post that up in a few

    My video on vimeo Skip to 10:40 for the mishap.:


    Youtube:


    Shark video

  6. #6
    Stockrxp's Avatar
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    i already have the double o-ring setup in place maby the carbon seal isnt at fault as much as i believe it to be. Jim im glad you still have your legs.....

  7. #7
    Here is something I'm trying. Have not tested it yet. I'm only out $6.
    Mark
    Attached Files Attached Files

  8. #8
    5.0. alex_baker202's Avatar
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    What's this o ring setup you speak of?

  9. #9
    ou812's Avatar
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  10. #10

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    Yeah the o-rings work great. I had the rad 4 also and like snoman said they are a pain. I got rid of it. Just work with the carbon seal some. It flings excess grease on the back of the motor and hull.

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