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  1. #1

    Default Spark plug surface corrosion??

    New poster with a "newbie-type" question.

    The specifics: 1948 Gray Marine Phantom Six - 104 engine. Restored several years ago but installed recently in a restored 1948 Resorter. Total run hours thus far, about 6-8. Engine runs well.

    The situation: Shortly after running the boat, all the tops of the spark plugs developed a white surface "corrosion" (The plugs are Champion UD16). I have attached two pictures. What is this corrosion? Is it normal? Can it be removed or prevented? The engine is located in an enclosed engine box, but I believe there is adequate ventilation.




    Thoughts?

    Thanks,
    Mike
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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  2. #2
    Join Date
    Mar 2009
    Location
    Portland, Oregon,
    Posts
    11,139

    Default Re: Spark plug surface corrosion??

    It appears to be mild salt water corrosive action on the spark plug bodies.
    Could be that the Champion finishes are prone to this.... I don't know... I don't use Champions!
    If the engine runs well, I'd not worry about it.
    Rick ... aka Ricardo..... AQ series Volvo Penta repair
    Portland, Oregon
    28' SDN F/B w/ twin Volvo Penta 5.7L DP drives

    "Intellectual growth should commence at birth and cease only at death." Albert Einstein

    Please... no PMs! Post your questions on the forum.

  3. #3

    Default Re: Spark plug surface corrosion??

    Quote Originally Posted by RicardoMarine View Post
    It appears to be mild salt water corrosive action on the spark plug bodies.
    Could be that the Champion finishes are prone to this.... I don't know... I don't use Champions!
    If the engine runs well, I'd not worry about it.
    Thanks for the reply. The boat is a soft-water boat. It has only been run in freshwater lakes.

  4. #4
    Join Date
    Sep 2008
    Location
    Maryland - USA
    Posts
    7,850

    Default Re: Spark plug surface corrosion??

    Champion isn't the best as far as corrosion resistance plating on their plugs.....

    You can likely remove it with a buffing wheel though it may return. To prevent it, you really need a decent plating on the plug's shell....so find a different make of plug or get the champions plated....

    A spray on like 'corrosion guard' may work very well but the heat a spark plug sees will likely deteriorate it rapidly....which means frequent re-applications....if you wanna try that, I'd suggest spraying after use after the engine has cooled down...like late Sunday or whenever you depart the lake...

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