I apologize for another thread, BUT I’m no professional. I replaced all my manifold gaskets to fix an oil, coolant, and air leak. I’m currently leaking a tiny bit of oil around the one plug stem. When the truck is running I can see the oil seep slowly around the plug stem. Truck is running perfect at the moment. What would cause this? I’m providing a picture of my engine in hopes it may reveal an issue that I’m ignorant of.

Picture: https:/imgur.com/a/e5GofL3

will not let me upload to forum due to being so big

 

Not sure what you mean by plug stem

Oil on the tops of spark plugs come from leaking valve cover gasket.
Oil on the tips come from leaking valve guide seals

Carbon build up in the head ports is bad, alot of it, engine has been running rich or sucking in alot of oil vapor from PCV Valve, for quite awhile

 

I just changed the valve cover gaskets to the right torque specs and used blue loctite. Damn.

Yeah the truck seemed fine - I haven’t noticed it running rich since I bought 2ish years ago. I did change the PCV valve a few days ago.

Advice? Maybe the valve cover is warped? I can’t imagine it being the gasket as it’s 1 week old

 

Cork gaskets?
Only thing that works on 4.0l OHV

You can pull out that spark plug and have a look at its tip

You can use spreaders on the lower side of the valve covers, have to get longer bolts but spreaders can help seal these stamped steel valve covers

Google: valve cover spreaders

They come in different sizes, real easy to install

 

Not cork. It’s the drivers side too so that damn EGR pipe is a pain. I supposed I’ll have pull the covers again.

Advice on carbon build up?

 

Run some seafoam or similar injector cleaner in the gas tank.

Did you look at the inside of the upper intake manifold?
To see if there was a coating of oil inside, so a PCV/blow-by issue

 

Yes there was a very thin coat of oil build up. Hopefully the PCV fixed the issue. Do you recommend a thicker oil other than the recommended 5w-30?

Lastly, should I also spray Sea Foam through the throttle body or will adding it to tank be sufficient?

 

Putting a liquid into the intake manifold of a running engine is a popular way to clean out carbon build up, but also a dangerous one, one slip and you can bend a connecting rod with a hydro-lock, too much liquid
But spraying a liquid into a running engine wouldn't do that, so sure, but it only cleans the inside of the cylinders not the inside of intake or head ports