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  1. #1

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    to replace or not to replace, that is the the question.

    Hi, I have a Sl 780 project..... I bought the complete gasket kits to replace the gaskets. I notice that include two of the big ring gasket for the crankcase. Now should i replace those? I am not very experience at this. I am afraid I may damage something if i open it up. any suggestion? what at the set of tools I need to complete this task? I read the menual and it had so many tool which i don't have......


  2. #2
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    I assume you mean Crank Seals. There should be 3, not 2.

    To replace those you need to split the engine cases. No special tools needed, but you do need to pay close attention to what you''re doing, and read the process thoroughly prior to installation. There are torquing sequences you need to follow, as well as continually checking the crank for binding as you torque.

    Should you do it, yes. If the crank seals were bad and caused the engine failure the first time, and you don't fix them, then you will damage the new top end.

    But, if you're unsure about your ability to do it without damaging somehting, then I would leave them be and perform a leak down test once the top end is complete. That will let you know if the seals are bad and actually do need replaced. You can then address the seals at that point.

  3. #3

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    Quote Originally Posted by xlint89 View Post
    I assume you mean Crank Seals. There should be 3, not 2.

    To replace those you need to split the engine cases. No special tools needed, but you do need to pay close attention to what you''re doing, and read the process thoroughly prior to installation. There are torquing sequences you need to follow, as well as continually checking the crank for binding as you torque.

    Should you do it, yes. If the crank seals were bad and caused the engine failure the first time, and you don't fix them, then you will damage the new top end.

    But, if you're unsure about your ability to do it without damaging somehting, then I would leave them be and perform a leak down test once the top end is complete. That will let you know if the seals are bad and actually do need replaced. You can then address the seals at that point.
    Yes,you are right, there are three.
    sound like a plan, so how do i do the leak down test?

  4. #4
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Please use the search function.

    I've explained how to do it many times before.

  5. #5

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    will do thanks.

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