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Greetings,

I've done the oil purge with air pressure before, but I'm thinking it would be a lot easier without it, particularly at my hangar.  The procedure (even the new one) says the air pressure is optional, though recommended.  I can certainly see that minimizing the number of turns without oil flowing would be nice, but I'm not sure if it's significant for the few times this would need to be done. 

For the sake of discussion, lets say I'm going to do this without air pressure.  The instructions say the air pressure is optional, but they don't mention any change in the hose prep.  My question is- why would you remove the "in" hose, and plug the "in" fitting on the oil tank if you're not using air pressure?  Makes sense for air pressure of course, but when not using it, this seems like a wasted step. 

Thanks,

Rusty

 

  • Re: oil purge without air pressure?

    by » one month ago


    It was probably easier to just say "Do It Anyway" than write an "If ... Then" instruction.  Or even more likely, it is just an Oops!

    If the level of the oil in the tank is above the Oil Pump Input fitting (Most are!) then gravity can replace Air Pressure.
    Loosen the Oil IN Fitting at the Oil Pump. This will allow the air to escape as the Oil drains into and fills the Hose.
    Once Oil starts to flow from the end of the hose, the hose is filled with oil.
    Tighten the Fitting and then proceed to hand crank until you register Oil Pressure.


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


    Thank you said by: RUSSELL A DUFFY

  • Re: oil purge without air pressure?

    by » one month ago


    Thanks Bill.  That all makes sense of course.  The oil level on one of mine is above the inlet, but on the test stand engine the level is below.  I have the fittings, and will likely just use the air pressure as recommended, but I was curious about the no-air-pressure procedure.

    Rusty

     


  • Re: oil purge without air pressure?

    by » one month ago


    I just did this yesterday. I didn’t use air pressure but I cranked that prop more times than I could count lol.  

    I checked all of the lifters and all solid. So it can be done without air. 


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