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I had the oil return hose to the tank disconnected with some loss of oil from the hose. Do I need to purge the lubrication system now? 

  • Re: Lube system purging

    by » one month ago


    No, but you may need to add more oil back to the system. The oil out the bottom of the carnkcase is just oil sitting there waiting to get pushed back to the tank.


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


  • Re: Lube system purging

    by » one month ago


    Thanks Roger.  I have been reading line maintenance   manual and it says purge is also necessary after cleaning tank which I also did. I did  not know the entire history of my engine and the possible use of 100LL. I also left engine with no oil in it overnight.  Filter removed and replaced  with no delay time. The manual also stats need for quick oil change procedure.

    What do you recommend!  Other than I should have read more before job.

    Headed down your way for winter Casa Grande area but airplane stays in Indiana.


  • Re: Lube system purging

    by » one month ago


    Rotax just released Revised Service Instructions regarding the purging of the Rotax 900 series engines 

    https://legacy.rotaxowner.com/si_tb_info/serviceinfo/si-916i-003-r1.pdf

     


    Thank you said by: Dave Philpott

  • Re: Lube system purging

    by » one month ago


    After looking at the SI there is a statement ( Not affected are the removal and replacement of components that do not drain the oil pressure galleries). 

    Will the oil galleries be drained by what I have done and  will they be drained by sitting with no oil in the tank and not have been primed by turning the prop  after oil filled.

    Thanks


  • Re: Lube system purging

    by » one month ago


    Let's think about this tank removal and cleaning and purge. When you do a normal oil change you drain the tank. That also means that any oil in the fittings on top of the tank are drained. 

    So if you disconnect both fittings and hold them up or put a plug in them then you don't loose any oil. You have drained no more oil than a regular oil change from the tank only. I always prefill my oil filter and when everything is back ready to go with oil then you can always vent the system.

    When you put the fittings back on then why would you need to do a purge? You never lost anymore oil than the normal everyday oil change.

    Purging should always be done after a hose change or any procedure that causes a large loss of oil or air was introduced into the system. When I purge I'm parinoid enough I do it twice. :) I do it pretty much like Rotax describes in the SB including removal of one plug per cylinder. I do rotate the prop about 70 times in a minute than get some oxygen LOL and then do it again. I can generate about 55 psi on the instrument panel, always have oil come out the oil retun hose and have never had a soft valve.

    p.s.

    During a purge I do add that EXTRA .5 liter to the oil tank to fill the air voids and not to get too low on the oil in the tank that may inject air further into the system.

    p.s.s.

    When in doubt it never hurts to do a purge.

     

    If there's another side of the story I'd like to hear it.

    SB quote.

    Reason

    This document should provide further guidance for the lubrication system with respect to:

    - purging

    - venting

    - to avoid air in the lubrication system

    ROTAX® was informed of a limited number of engine failures in the field resulting from a lack of

    proper oil purging after the engine had been first installed and /or the engine had been re-worked.

    This Service Instruction should help to make sure that the engines do not suffer such engine failures

    in the field. As air can be trapped in the valve tappets and cause valve train failure it is very

    important to complete these instructions in their entirety.


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


    Thank you said by: Dave Philpott

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