SBT Jetski Engines, Parts & Accessories

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  1. #1
    Joined
    Jun 2005
    From
    Melbourne, Australia
    Posts
    249

    Default Opened 720 engine up-no crankcase gasketseal!

    Hi everyone,

    I just finished pulling apart my engine (720 rotax) and was surprised to see that there was no gasket/sealant or anything between the 2 crankcase castings. The only thing i found to fill any possible air gaps was oil! Is there supposed to be some kind of gasket there?

    If there is supposed to be a gasket i am even more surprised-the engine was still running well and it's in excellent condition on the inside (no marks on the cylinders, crankshaft not out of spec, etc-i pulled it apart to do a piston change, replace the crankshaft seals and generally do some preventative maintenance. The reason for this is i have a factory pipe on my ski and didn't want to wait till the engine blew up.

    Has anyone had a similar experience with the no gasket thingy?

    Thanks.

  2. #2
    Joined
    Mar 2003
    From
    SBT
    Posts
    21,545

    Default Re: Opened 720 engine up-no crankcase gasketseal!

    I assure you there was sealer there. Factory engines have a very thin coating of case sealer that would appear to be an oil like substance to someone unfamiliar to them.
    SBT Tech Support is here to help with your problems.
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