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  1. #1
    TX21's Avatar
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    GPR rear crank seal

    Summer 2010 was lame. I worked on my GPR in my spare time all season and never got to ride it. I replaced the cases first since my small JB weld (long story) didnt hold over the winter. Then the new rear crank seal was leaking air with 10 minutes of run time . So I pulled the motor and put a new seal on following the Riva write up. I looked at the crank where the seals rest and it looked fine. The crank has 20-25 hours of run time on it. I bought it from WFO so I know its not a pile of crap... I think. So now here I am again, 10 minutes of run time and the rear crank seal wont hold over 3 psi. Any ideas what could cause this?

    My boat is a 2000 GP1200R with F/A , t-handles, acc. pump removed and followed the jetting from that write up. Other than that its stock.


  2. #2
    is there a worn groove in the crank? where is it leaking exactly? crank to seal, or seal to case?

  3. #3
    Superman! fivespeedsteed's Avatar
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    you use a decent amount of marine grease on the seal where it touches the crank?

  4. #4
    Happily Self-Employed WFO's Avatar
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    what seal did you replace? both rear or just outer rear?

  5. #5
    TX21's Avatar
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    No grove the crank has maby 20 hours on it. Yes I used grease as the Riva write up says to do. I replaced both seals both times. And its leaking on the crank shaft where it touches the seal. I am gonna be pissed by the time I get it all appart and find out my crank is screwed up. You know my coupler seems to fit to close to the seal. I wonder if thats the problem.

  6. #6
    the coupler being close is normal...

  7. #7
    Happily Self-Employed WFO's Avatar
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    gimme a ring to chat

  8. #8
    john zigler's Avatar
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    what brand seals did you use?? OE, or cheap?? ( like WSM, SBT etc)

    also, make sure the spring did not come off of the lip ( see pale riders pic above)
    Last edited by john zigler; 01-23-2011 at 11:31 AM. Reason: adding info

  9. #9
    TX21's Avatar
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    Quote Originally Posted by john zigler View Post
    what brand seals did you use?? OE, or cheap?? ( like WSM, SBT etc)

    also, make sure the spring did not come off of the lip ( see pale riders pic above)
    Spring is still on. And I used a WSM seal both times. After talking to WFO I am going to get some OEM seals and hope I don't have to unload a clip of 9mm ammo at the lake in a few months

  10. #10
    smacota1's Avatar
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    Quote Originally Posted by TX21 View Post
    Spring is still on. And I used a WSM seal both times. After talking to WFO I am going to get some OEM seals and hope I don't have to unload a clip of 9mm ammo at the lake in a few months
    There is nothing better than OEM seals and gaskets (quality and tolerances are critical). If there is no pitting or grooves then it is most likely the seals.

    Also, it is very easy to mix the two seals up if you do not pay close attention to them......ask me how I know!!!!!

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