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Applying thermal conducting paste to a spark plug.

in 912 / 914 Technical Questions 13 years ago
Here is a quick little video on applying the heat conducting paste to a spark plug. This is not a professional video just a quick demo at the airfield during some maintenance.

http://www.rotax-owner.com/information-reg/elearning-videos-reg/391-2oi

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

  • Re: Applying thermal conducting paste to a spark plug.

    by » 13 years ago

    Hi Roger,

    Thanks for the info.

    Is this paste really necessary?

    Never used it.

    Best regards Jan
      
    Report

  • Re: Applying thermal conducting paste to a spark plug.

    by » 13 years ago

    Hi Jan,

    You really should use it. Yes it runs without it, but it runs better with it and it isn't that expensive and a little goes a long way.
    Kind of like not balancing carbs. Yes the engine runs, but it isn't good. Here is the page out of the Line Maint. manual.
    SparkPlugInstallation.pdf (You do not have access to download this file.)

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

      
    Report

  • Re: Applying thermal conducting paste to a spark plug.

    by » 13 years ago

    Goodevening Roger,

    Which type of paste is recommended?

    1. WACKER P12 (recommended by ROTAX) 0.81 W/mK conductivity price 1.30 euro for 1 gram
    2. KERATERM 10 W/mK conductivity price 4.25 euro for 7.8 grams

    All silicon based.

    Best regards Jan
      
    Report

  • Re: Applying thermal conducting paste to a spark plug.

    by » 13 years ago

    Hi Jan,

    I have found the dealers in the US don't all carry the same product. The Wacker P12 for us is kind of hard to come by and expensive, but if you live overseas it may be much easier.

    Here is one good source: MG Chemical 860 heat conducting paste:

    http://www.alliedelec.com/search/productdetail.aspx?SKU=6610150

    http://www.mouser.com/ProductDetail/MG-Chemicals/860-150G/?qs=nnh8%2FA0SuH9Z8wwHd52T%252bw%3D%3D

    http://parts.digikey.com/1/parts/1841523-heat-trans-compound-silicone-860-150g.html

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

      
    Report

  • Re: Applying thermal conducting paste to a spark plug.

    by » 13 years ago

    Hello,

    I have purchased the Wacker P12 in Europe: easy.

    I applied the amount of paste as indicated bij the video of Roger Lee but may be I was too generous!

    Here is what happened to me.

    I have installed new spark plugs and applied the paste 2/3 as reecommended. Made a flight of 1.5 hrs no problems. Next morning I tried to fire the engine: nothing!

    So I removed all spark plugs and I was surprised to observe that the paste intially applied 2/3 was spread all over the threads of the spark plugs. So it was beginning to sink in that this was too much causing some sort of electrical isolation.

    Therefore I cleaned all the plugs so that the threads showing shiny metal again. However the entrance of the treads of the cylinders heads were contaminated with paste so that when you install the plugs again the electrodes were contaminated in the process of inserting.

    All cleaned and installed: the engine did fire again with no problems.

    Conclusion: use very little paste only 1/3 at the middle. Make sure that the heads/ring of the spark and the last threads of the plugs remain clean!!!!!!!!!!!!!!!!!!!!!

    Bon vols Jan
      
    Report
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