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How should I use the Sight Glass as shown in the attached file?

Is it recommended to open the radiator cap and check the level of the liquid before every flight, or be satisfied with sight glass test?

Thank,

Joel Nir

 

8451_1_Expansion tank and radiator cap from maintenance manual.pdf (You do not have access to download this file.)
  • Re: Expension tank and radiator cap

    by » 6 months ago


    I never noticed the sight glass before...  I guess if you don't see coolant there you know you are way too low.  But you are supposed to have coolant right to the top of the expansion tank.

    I usually just have a look at what's in the overflow tank, to see if I'm losing any fluid between flights.  There's a reason why it's transparent, and why it has MIN and MAX markings.  After a flight it will contain more fluid than when cold, but that "extra" will be sucked back into the expansion tank as the engine cools.


  • Re: Expension tank and radiator cap

    by » 6 months ago


    My installation does not use the Official Rotax Expansion Tank, so I have no sight glass.
    My overflow bottle and the hose going to it are transparent.
    As long as the Bottle is half full AND the hose is completely full, I know the Expansion Tank is also completely full.

    The sight glass would also be a good indication that the expansion tank is full.
    There no reason to remove the pressure cap before each flight to check.
    If your sight glass shows full, and the overflow tank has fluid, you're good to go.
    If your connecting hose is transparent and shows full, even better!


    Bill Hertzel
    Rotax 912is
    North Ridgeville, OH, USA
    Bill.Hertzel@Yahoo.com
    Clicking the "Thank You" is Always Appreciated.


    Thank you said by: Glenn Martin, Larry Avimeleh

  • Re: Expension tank and radiator cap

    by » 6 months ago


    Interesting idea of having a transparent hose to the overflow bottle.  Mine isn't.  I guess I just figured if the amount in the overflow goes up when it's hot and back down when it's cool, it implies the expansion tank is full and that connection is working properly.


  • Re: Expension tank and radiator cap

    by » 6 months ago


    If you take that cap off before every flight you'll be buying $80 caps more than most of us.


    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell


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