560 injector leak

I recently purchased a 1961 Farmall 560 and was able to get it home today. It runs perfectly except one injector leaks externally. I am no diesel mechanic, but if you are looking at the injector housing you have the hex nut holding the line on and below that another hex head. It is leaking from between lower hex head and injector flange. What do I need to do?
 
To tighten, do I just remove the line and turn the bottom hex head in, or do I have to remove the injector to tighten? I don't want to sound dumb, but have never worked on a diesel and don't want to damage anything!!!
 
just loosen the line and tighten the injector into the housing. then tighten line again.
 

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