Hi all,

I just did an oil change on the 914 and foolishly turn the prop to pump out any extra oil. I got an extra half a cup after a few turns.

i then filled everything up and started it briefly.  It occurred to me that I may have just introduced air into the lines, so I shut down. 

My assumption is that I need to purge the system and check for soft lifters. Do I have this correct?


thanks Damien

ps. If so, what thread is the blocking nut of the oil tank in line?

  • Re: Do I need to purge

    by » 4 weeks ago

    No, Never.

    Only on opening of oil cooler, oil pump needs purging.

  • Re: Do I need to purge

    by » 4 weeks ago

    Hi Damien,

    There is no need and you shouldn't rotate the prop if the oil system has no oil in it or the system is open. If you do a purge should be done.

    I was always taught he should purge. Just like if he was doing a hose change. I had a customer do this same thing once and Eric Tucker said yes he should purge. Here are the two things that could happen.

    Is there a chance he's okay. Yes

    Now is there also a chance he's not okay and causes severe engine damage, Yes. So you're flipping the coin on whether you may have to replace an engine for $18.5K just for the engine not including labor.

    Why roll the dice for 20 minutes of easy work. There are no do overs if it fails.

    Better safe than sorry.


    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-574-1080 Home (TRY HOME FIRST)
    520-349-7056 Cell

  • Re: Do I need to purge

    by » 4 weeks ago

    Thanks Roger.

    Purge it is, I rotated the prop while the tank was empty. Rookie mistake.


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