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Spark plug 1-3 color difference - Aeroprakt Panama

in General Tech Discussion 10 years ago

  • Re: Spark plug 1-3 color difference - Aeroprakt Panama

    by » 10 years ago

    A silicone thermal transfer paste should be applied to all 912 and 914 engine spark plugs. This is in the manual.
    No anti-seize.

    http://www.amazon.com/MG-Chemicals-Silicone-Transfer-Compound/dp/B008UH4FF6/ref=sr_1_sc_1?ie=UTF8&qid=1422079307&sr=8-1-spell&keywords=MGL+electrical+paste

    Rotax video:

    https://www.youtube.com/watch?v=9lntHJPbUdI

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

      
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  • Re: Spark plug 1-3 color difference - Aeroprakt Panama

    by » 10 years ago

    Rob and Roger:
    Thanks. Will look for the paste. Next week the mechanic will help me check the carb.
    Rgds
    Ricardo
      
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  • Re: Spark plug 1-3 color difference - Aeroprakt Panama

    by » 10 years ago

    Here's two pictures of the #1 and #3 spark plugs. They were removed after approx 100 hrs.
    Fuel was mostly Mogas 93 octane with 10%E. The #3 plug is near perfect with the tan color while the #1 is much darker. I had thought this to be a problem until I called Dean Vogel.

    Dean, from Lockwood Aviation, said it's normal for the 912 engines.


    DSCN1700.JPG (You do not have access to download this file.)
    DSCN1701.JPG (You do not have access to download this file.)
      
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  • Re: Spark plug 1-3 color difference - Aeroprakt Panama

    by » 10 years ago

    It is normal for an engine after a prolonged idle, it is not normal if that engine has been running at cruise rpm and immediately shut down. Are your plug gaps between .023-.027? The black deposits are due to an imbalance of air flow at idle rpms, but should go away at higher normal running rpms. I have seen hundreds of dry black soot plugs from the normal idle issue. Yours to me looked more cooked on like the black never goes away. I would change the plugs and fly a couple of hours and check them again. Once with a prolonged idle and once with a shut down immediately after a high rpm run.
    Many of us tend to toss plugs at 75 hrs. Verses a 100 hrs, but that's a personal preference.

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

      
    Report

  • Re: Spark plug 1-3 color difference - Aeroprakt Panama

    by » 10 years ago

    Hi Roger,

    Those plugs were the original from the factory. I did not check the gap when I removed them. The plugs were changed on a cold engine. The idle time before shut down was approx. 3-4 minutes after taxi back to the hangar. Plugs were changed the next day.

    If you suggest the plugs be changed after 75 hours I can certainly do that.

    When it's time to change the current set, I'll run at a higher RPM just before shut down and see what they look like. I believe I'm just about at that mark now.

    Thanks
    Rich
      
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