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Spark plug paste

in General Tech Discussion 12 years ago
Where is the best place to get the paste for the plug threads on the 912? When I called Aircraft Spruce the parts person never heard of it. Then I found the Rotax part number and they wanted $ 150.00 for the bottle.

  • Re: Spark plug paste

    by » 12 years ago

    Tim,

    I get mine at radio shack. It is the same stuff that is used as heat sink grease in electronic equipment. It is $3.95 a tube and is enough for two or three plug changes.

    Bill.
      
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  • Re: Spark plug paste

    by » 12 years ago

    Here's enough to keep you going for a while.


    http://www.cps-parts.com/scripts/prodView.asp?idproduct=245

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

      
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  • Re: Spark plug paste

    by » 12 years ago

    Why on earth does anyone bother with it? :sick: Does anyone actually think that a tiny smear spread around one third of the threads of a plug is going to make the slightest difference? :dry:

    NO :woohoo:

    John
      
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  • Re: Spark plug paste

    by » 12 years ago

    Actually John it does. Since things like plug threads are not zero tolerance the paste fills in the small gaps within the threads. The chemical compound helps heat between dis-similar metals equalize. If the threads were a zero tolerance you wouldn't need a compression ring to keep them from leaking.
    The second help for the plug threads is it will lubricate them and help reduce the chance of galling from combustion particles that can and do enter the threads upon removal and insertion. The spark plug torque is based on a wet torque and compression ring compression and without any paste that changes.

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

      
    Report

  • Re: Spark plug paste

    by » 12 years ago

    Factory testing shows that the Wacker P12 paste reduces the spark plug temp by 10C. I would not use the Radio shack stuff on an aircraft. We only use what Rotax recommends on such a critical component. We sell it in small containers as only a tiny amount is needed over the life of an engine.
    Rob
      
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