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What does this big plug do on the drivers side head?
I see a very small amount of what appears to be oil around it? Can it be tightened? If it could save me a trip to the dealer I would love it. What is it for?
When they machine the head, that hole provides access for the cam cap machining tools. Then during assembly, that hole provides access for the cam shaft locking tool. If there is oil, you need to replace the metal/plug inside the cap.
That is a nice clean engine! That is definitely the chain tensioner for cylinders 1-3. The torque spec is 59 ft lbs. I'm not sure if you want to remove it without first locking the crank and cams in position. I've got a locking kit if you are interested.