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oil on spark plug thread

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fatboyjonjon

Proven Member
47
4
Aug 11, 2015
tazewell, Virginia
Doing some maintenance while I have time and decided to pull the plugs just to check. All the plugs looked ok, but 1 plug the threads were soaked with wet oil. The tip didn't look any worse than the other 3 but I've been using some oil and now I know where it's going. I replaced the valve cover gasket already and the inside of the spark tube is clean and dry. What's my next point to check? Could the base of the spark tube be cracked or something letting oil leak around the plug threads?
 
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