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  1. #1

    Blown SC and maybe cracked block? Please HELP!

    I was wondering if anyone could guide me in the right direction. I am having a lot of trouble with one of my two skis. I own 2 2005 Seaa Doos RXPS, Both have only 60 hours on them. The one sea do is currently broken. I am able to turn it over and start it but there is a very loud knocking noise. I assumed it was a rod so i started to pull it apart. When it came time to take off the timing chain i ran into problems. I tried to turn the crankshaft with a socket from the bolt on the SC. It turns but it dose not turn my crank shaft. The teeth on the gear of the SC look Good.

    Is there another way I can turn the crack shaft to lock it in place so i can pull the chain of to get to the pistons?

    What could be the reason why the SC won't turn the crankshaft?

    Could that be what is creating the knocking noise?

    Also I put straws in the spark plug socket to make sure all three pistons where moving. They are but there is antifreeze inside. Did I blow a gasket or even worse could the block have cracked?

    I would like to try and fix it myself instead of buy an SBT motor but I will if i have to. I would like to properly diagnose it first though.

    I would greatly appreciate it if anyone could give me any guidance or put me in the right direction.

    Thank you,
    Tom


  2. #2
    Kmorningstar_rxp's Avatar
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    Could be a broken vavle flying around, if it's an 05 without updated vavles. That's normally what would cause the knocking and as well the coolant.

  3. #3
    Kmorningstar_rxp's Avatar
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    You can pull the head off how it sits and check. And then with someone's help, turn the crank with the sc like your doing to lock it in place. Just have someone hold the timming chain

  4. #4
    Thank you for the very fast response. I will try that later and get back to you.

  5. #5

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    It is easy to remove the chain-- remove the tensioner, remove the 1 plastic guide, remove the cam sprocket and the chain falls. To remove the pistons requires splitting the cases and alot more steps. Rotating the internals of the engine is done by rotating the crank shaft.

  6. #6
    Quote Originally Posted by Kmorningstar_rxp View Post
    Could be a broken vavle flying around, if it's an 05 without updated vavles. That's normally what would cause the knocking and as well the coolant.
    Got it off. These are some pictures of the pistons and valves. Any thoughts?

    Click image for larger version. 

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  7. #7

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    to remove the pistons, the rest of the motor needs to come out of the haul.

  8. #8
    Quote Originally Posted by jim View Post
    to remove the pistons, the rest of the motor needs to come out of the haul.
    Hello Jim and thanks,

    Do you know why there is so much antifreeze Inside of it?

  9. #9
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    Did you drain it before removing the head?

  10. #10
    Kmorningstar_rxp's Avatar
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    Well, no broke vavles, but I'd look at the block or head being warped, or could just be bad head gasket, but... You also said you hear a knocking... I'd pull it all out and split the cases. You'll find the bearing spun or Atleast with flat edges

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