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Got a concerning leak on an older 912 ULS. Attached photo shows the bolt where it's coming out of. Just in front of the starter. I've dried everything up and run the motor twice to confirm it's coming from there. Too much oil loss to fly. 

Fretted or cracked case causing leak? I haven't checked the torque as I can't find the torque specs in the manual. 

Any ideas? I fear it may need a new case, hardly worth it on an older engine like this I feel. 900 hours, 05 model. 

Kindest,
JP

 

8034_1_IMG_9255.jpg (You do not have access to download this file.)
  • Re: Oil Leak 912 Casing Bolt

    by » 6 days ago


    Without checking its specific torque, have you checked to see if it's loose?


  • Re: Oil Leak 912 Casing Bolt

    by » 6 days ago


    LikeTyler said, Make sure it isn't just loose.

    It is hard to tell what we are looking at from the photo, But if it is an 8mm Crankcase Bolt, replace the washer and use 18 ft∙lbs as a reasonable number.


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


  • Re: Oil Leak 912 Casing Bolt

    by » 6 days ago


    This diagram is a little hard for me to decipher but I'm confident it's no. 13 that's. the issue. 

    I notice that this bolt has significantly changed on the newer cases. 

    26519_2_72-20-00 Crankcase 27811 b.jpg (You do not have access to download this file.)

  • Re: Oil Leak 912 Casing Bolt

    by » 6 days ago


     If its #13, it's an M8 and 18 Ft∙lbs would be reasonable.

    The actual number will be in the Overhaul Manual which isn't readily avaiable.

    If we can get the attention of the ADMIN, perhaps he can look up the number for us. (Hint, Hint!)  laughing

     


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


  • Re: Oil Leak 912 Casing Bolt

    by » 6 days ago


    I found 30nm online, but I stand to be corrected.


    So what's the job of this bolt? Clamping the crank main bearing? 

    I've had someone suggest pulling it, getting some high temp silicone in there and replacing the washer. Thoughts?


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