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I just completed the first flight with my RV-12 / Rotax 912 and it went very well. I removed the cowl to inspect for any possible leaks etc.. post flight and for the most part everything looked fine.

However, I did notice a few drops (maybe 1/4 teaspoon at most) of dark black oil on the lower front edge of Cyl#1. It did not come from the value covers (the perimeter of the #1 cover was clean) It did appear to originate from the base of the stud that holds the bottom nut for the exhaust flange. There was very little, not enough to drip even, but I hadn't noticed any oil or dirt in this location after previous ground runs of the engine. Might have been there before and I missed it as I needed a dental mirror to see in behind where most of it was. I'll closely inspect after next flight to see if this is real or not.

Question - Anyone ever seen an oil leak on a 912 at this location? I didn't think these engines leaked very much at all.
  • Re: Possible leak at cylinder head exhaust stud

    by » 7 years ago


    Maybe it was residue from some thing and just got missed? Maybe some dripped from and oil filter or mag plug check? Oil shouldn't come out at an exhaust stud. Where you can find an ooze occasionally is along the bottom edge of the valve cover. Wipe these areas clean and fly. Then check again in a few hours. Wipe your finger along the bottom edge of the valve covers. This area usually doesn't drip, but you can get oil on your finger from an ooze.

    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: Possible leak at cylinder head exhaust stud

    by » 7 years ago


    I ran the engine for about an hour today and rechecked the areas where I had cleaned off the oil. Nothing there so it was false alarm. Lesson for me is to thoroughly clean all then engine surfaces before test running it next time - impossible to detect changes otherwise. Makes sense to me now!

    Thanks for your reply Roger.

  • Re: Possible leak at cylinder head exhaust stud

    by » 7 years ago


    Here's a neat trick to find elusive leaks.

    First clean the engine really well. Then get a can of foot powder spray and spray the white powder all around the area you suspect the leak. Then run the engine for a short time. Then look for the leak. The tiniest little oil ooze will show up like a neon sign. Then just wash the powder off. You maybe surprised what you find when you do this.

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

    Thank you said by: Joachim Wagner

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