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2005 912 uls 340 hours Prop very difficult(gorilla difficult) to turn while engine cold. Cranks and starts normally.

possible causes.

 

Thanks 

 

  • Re: Prop hard to turn

    by » 6 weeks ago


    Check out crankcase fretting on this forum. That is what you may be experiencing.


  • Re: Prop hard to turn

    by » 6 weeks ago


    You have the old-style case, which was prone to fretting and consequently pinching the crankshaft.  Is it only hard to turn just at first?


  • Re: Prop hard to turn

    by » 6 weeks ago


    I have read about the fretting and am concerned about that. Most reports seem that the hard turning is when the engine is hot and is better when the engine is cold. Seems to be the opposite in this case. 

    my plan is to change oil and filter and check for metal on magnetic plug and filter. Also If it is hard to turn tomorrow I will loosen the bolts on number 2 cylinder and see if that relieves. 

    Appreciate everyone’s thoughts.

     


  • Re: Prop hard to turn

    by » 6 weeks ago


    I am going to throw the Hydraulic issue into the pot.

    Is it Gorilla hard to tun the prop the first revolution and then easier after the second and third revolutions?

    Or is it hard to turn at all points in the cycle and not just coming through the compression points?


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


  • Re: Prop hard to turn

    by » 6 weeks ago


    I like Bills idea, explore that first.


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