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Can Somebody identify what This Part of the Engine is?

Gergify

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Greetings everyone! So I have a 1980 CB750F that is leaking a significant amount of oil out of this guy while driving (not while sitting):

11251598_10153330288456908_69099278_n.jpg

I can not figure out what it is or what it's for, It's not listed on any parts diagrams I can find. Any ideas?
 
I,m pretty sure it,s the cam chain adjuster. Don,t know if it,s broke or not. I,m not at all familiar with the DOHC,s I,m just going on the look with the bolt and jam nut which is used on the SOHC, Sorry not much help.
 
Look at the bottom center of the first page in the link... shows the tensioner, bolt, locknut... and what looks to me to be a plug/seal that would go in the hole in front of the engine.
 
That's definitely what it is! Thanks Guys!

Now, since it appears mine is completely gone, is it going to be as easy as popping a new one back in, or does it still require taking off the head?
 
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