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Thread: 912 oil level

  1. #1

    Join Date
    Jun 2010
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    Cabot, Ar
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    5

    Default 912 oil level

    I've just purchased a KF III with a Rotax 912 it has the new style oil dip stick. On my preflight I found the oil level about a 1/8 " below what appears to be the operating range after hand cranking the engine. I added oil to the mid point of the operating range and after returning from a short flight I noticed oil on the planes belly and found that my oil separator bottle was full.

    Did I overfill ? If so what is the correct oil level or procedure fof checking the oil level ?

    Thanks
    John Roman
    N876KF

  2. #2

    Join Date
    Mar 2009
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    Titusville, Florida
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    Default Re: 912 oil level

    Did you "burp" your engine before checking the dipstick? Page 10-15 of the Operators Manual describes this procedure. Doing this assures that most all of your oil is in the tank. This gives you a more accurate dipstick reading.

  3. #3
    Senior Member HighWing's Avatar
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    May 2009
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    Goodyear, AZ
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    Default Re: 912 oil level

    John,

    I agree with Tom. I suspect you didn't quite empty the crank case during your pre flight "burp". I found that with my 912 powered IV that it never used oil so topping up was not an issue and I could pretty much know the degree of burping by looking at the stick. I think in time you will find the routine with your engine as well. I found that as the engine hours increased - seating the rings -and the bypass gas volumne decreased, it took more "blades" to burp the oil - 100 blades. Did you hear the gurgling sound? When all the oil is in the tank, you will hear the bypass air gurgling in the tank. I think this is why the nickname burping came about.

    Lowell

  4. #4
    Administrator DesertFox4's Avatar
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    Aug 2008
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    Default Re: 912 oil level

    John, I did the same thing on my first model 3 with a 912. Never used a drop between oil changes. On mine I only put in 3 quarts on an oil change. If I tried to put in the last 1/3 of a quart as stated in manual it would just blow it overboard and I'd have to clean it off the bottom of the fuselage. On a long cross country flight I'll take an extra quart of oil just in case but I've never used it.
    I also usually check my oil when it's hot. I let it sit a few minutes while refueling. Lets the air dissipate out of the oil in the oil tank. Gives me a more accurate reading.

    Yours sounds normal to me. Enjoy the model 3 with the Rotax. It's a blast to fly.


    DesertFox4
    Admin.
    7 Super Sport
    912 ULS Tri-gear


  5. #5

    Join Date
    Jun 2010
    Location
    Cabot, Ar
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    5

    Default Re: 912 oil level

    Thanks for the help. Apparently I was turning the engine enough to "Burp" the engine. Went back to the hanger and tried again and all is ok.
    Thanks again
    John Roman

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