Burping the 912

[Ehfox]

Hello,All...how many times are we suppose to spin the prop to "burp" the engine before checking the oil or starting it?. When I watched Av8r3400 do it @ Oshkosh,you could hear his oil tank actually make the sound....but I must have turned my prop 15 (1/2 turns) and it still would'nt make a noise...Thanks, Dan

[Dorsal]

Sometimes more, sometimes less but it will always make the sound. Can definitely take more that 15 1/2 turns at times.

[Peteohms]

Make sure to remove the oil cap. You can turn it over with the starter to speed things up then maybe it will take fewer turns.

[Av8r3400]

I've had to turn mine 20 full turns or more to get a burp if the motor hasn't been run in a while...

[Iceflyer]

How necessary is this procedure really?

I have never done it. I just check the oil level after flight or after taxi to the fuel pumps. Have never had to add oil between oil changes either.

[sdemeyer]

I burp my 912 only before the first flight of the day. Before I changed to a "normal" oil cooler, I used to get drastic changes oil level readings resulting in me overfilling the oil tank. I don't know what difference the cooler made but now the oil level never changes on a before or after burp. Even though I don't think burping is necessary, I still do it because that's the habbit I got into.

To answer your question, it takes me an minimum of 18 turns, sometimes more to get the burp.

Scott