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Does anyone know where to get a new sightglass for the expansion tank?  Or at least what size the threads are for sure?

  • Re: Expansion tank sightglass replacement

    by » 2 years ago


    This is the second query about expansion Tank Siteglasses in the past week.
    The last one was on an RV-12 with a 912is engine.
    What Aircraft and Engine is this one?
    What is the Part Number on your expansion tank?

    It is Not a Rotax part as far as I know, so it probably is coming from the Airframe manufacturer.
    As mentioned in the Other Thread, it does not make a lot of sense to install one.

    That said; If it is threaded into one of the Cooling Hose Ports on the expansion tank, it is most likely M18x1.


    Bill Hertzel
    Rotax 912is
    North Ridgeville, OH, USA
    Clicking the "Thank You" is Always Appreciated by Everyone.


    Thank you said by: RotaxOwner Admin

  • Re: Expansion tank sightglass replacement

    by » 2 years ago


    I read the other thread. That’s what let me know they can come out. I messed up the threads on the sightglass getting it out. It would be nice to have it since it came with it, but I have no problem just plugging it. Hence, the question about thread size. It’s on a 914 in a Magni M24 gyro. It looks like 922 666 is the tank #. And from what I can tell the thread is12-1.25. I just wondered if anybody knew for sure. Thanks. 


  • Re: Expansion tank sightglass replacement

    by » 2 years ago


    Thanks for the Part Number. I found it.
    I have not encountered one, even though it appears that the Sightglass has been around for quite a few years.
    My installation does Not use the Rotax Tank.
    It looks like the Sightglass is considered part of the tank and is not available separately.


    Bill Hertzel
    Rotax 912is
    North Ridgeville, OH, USA
    Clicking the "Thank You" is Always Appreciated by Everyone.


    Thank you said by: Bill Keenan

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