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purging of lubrication system

in 912 / 914 Technical Questions 12 years ago

  • Re: purging of lubrication system

    by » 11 years ago

    Hi Terence,

    Two answers here. First Rotax does like to see an oil purge if you pull the tank and break open the lines. The second answer is there is a way to get around it. When you pull the "oil in" line off then put a rubber plug in it and don't allow any oil to drip out. When you pull the "oil out" line off then immediately before any oil comes out put a rubber plug in it. I can usually do this with only 1-2 drops of oil. You now have lost no more oil than doing a standard oil change and removing the oil drain plug. Be diligent when putting the lines back on to remove the plug and put the lines back on the tank without loosing any oil, then fill the tank with fresh oil and rotate the prop (as described in the manual) to finish filling the filter and hose. You don't always need to pull an oil tank at the oil change for cleaning, just at certain times it is advisable.

    Hi Mark,

    Poor choice of words on my part. My thinking verses my typing is in shorthand at times.

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

      
    Report

  • Re: purging of lubrication system

    by » 11 years ago

    Hi Terence,

    Two answers here. First Rotax does like to see an oil purge if you pull the tank and break open the lines. The second answer is there is a way to get around it. When you pull the "oil in" line off then put a rubber plug in it and don't allow any oil to drip out. When you pull the "oil out" line off then immediately before any oil comes out put a rubber plug in it. I can usually do this with only 1-2 drops of oil. You now have lost no more oil than doing a standard oil change and removing the oil drain plug. Be diligent when putting the lines back on to remove the plug and put the lines back on the tank without loosing any oil, then fill the tank with fresh oil and rotate the prop (as described in the manual) to finish filling the filter and hose. You don't always need to pull an oil tank at the oil change for cleaning, just at certain times it is advisable.

    Hi Mark,

    Poor choice of words on my part. My thinking verses my typing is in shorthand at times. You are right about crank case pressure to push oil to the tank and the pump does everything else before hand.

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

      
    Report

  • Re: purging of lubrication system

    by » 10 years ago

    Hi, I'm going to replace oil lines and cleanup oil tank. If i make this without turning by prop I should make purging?
    I'm not sure, after purging I should run engine and after this run open head covers and check slots sizes?
      
    Report

  • Re: purging of lubrication system

    by » 10 years ago

    Yes you will need to do a purge.
    Once you drain the oil lines it needs to be purged. While the oil lines are off don't rotate the prop. It will induce more air and there is no need to rotate the prop with the hoses off. After the purge you can check the rocker arms for softness. So long as you do nothing, but drain the oil lines and don't rotate the prop I would imagine after the purge the rocker arms will still be hard, but should be checked.

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

      
    Report

  • Re: purging of lubrication system

    by » 10 years ago

    I have an old 912 and oil tank needs to be removed from plane for every oil change. I don't bother trying to purge every last drop of old oil, just change tank supply and oil filter. Old oil remains in lines/cooler. So I refill with new oil and turn prop until tank gurgles to show that sufficient oil supply is available for operation. The amount of old oil in system is small and negligible.
      
    Report
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