normv
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The plug actually seals on the washer not via the threads, so unless it is majiorly cross threaded it is not the tread . Just change the plug, they generally leak up the edge of the insulator , incidentally I have 2 that do that on my one of my engines after I wash it down and they are still there, as Judson says don't worry about it, unless it is like a volcano. You often see plugs with a brown mark around the bottom of the insulator when you are replacing them from this type of leakage, I would be more concerned about the oil leak fro the rocker cover that is putting the oil there to allow you to see the bubbles. I know this is probably only a small one, it is a Jensen after all.
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