2.4 ecotec engine unknown bolt?

Question

My 2009 chevy malibu 2.4 seems to be leaking oil from a bolt located on the top left side of the crank pulley, looks like a torx key in the middle not sure what size. Looks like a cylinder on the timing cover. Can someone tell me what that is? Before I attempt to fix it
http://tinypic.com/r/15d6g7m/9

Answer 1

That is the water pump bolt for the front timing cover

Comments

Is there a possibility of motor oil leak from this bolt? Or coolant?

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there would only be oil you have a cover on the top that area once you remove silicone it