Primary Leak
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When you back off the big jam nut it goes over the grungy threads that were exposed to the elements and puts enough force on the center bolt to tighten it too tight to come off by hand.  Go get the Allen wrench and break it free.
Notice how the chain runs diagonally to the tensioner.  When I was working in Detroit as an automotive engineer we had a phrase:  Design Intent.  I wonder if the design intent was to have the chain go at an angle to the tensioner?  Be absolutely sure you put it in the same way it came out.  As you can see from the picture above, the open side with the little hollow in the middle is facing out.  The other side of the tensioner does not have this hollow.  You will never be able to see if the chain is in the groves right because-- surprise-- the tensioner is part of the cover, not the engine case.  Does Honda let this much nylon get ground up and mixed with the transmission lubricant?  Just wondering.  No biggie.  It's been this way for 50 years.  Tradition and legacy again I guess.  Hopefully the noise regulations will force them back to the 76 and earlier style tensioner that at least does not use the cover.
Wash the primary off with a lot of clean water.  Blow it off with clean dry oil free air.  Towels are bad because they leave lint but at least lint will be ground up in the bearings unlike silicone which will destroy any roller bearing.  (Can you tell I like silicone?)
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