Okay just started cleaning the valve cover and baffle. The hose that is coming off of the rear of the valve cover seems to be clogged when I blow in it. I told that this is the CCV port? Hopefully after I clean the port and the baffle my problem will be fixed. I
Use carb cleaner on the head. Plug the oil ports so the gunk you clean off doesnt go down inside. When you get does run one of the heavy detergents like seafoam or kerocene, etc for a couple minutes and change the oil out. That is bad but common. The 2.5l/4.0 can both take a beating. Man that is bad!
I personally dont think you need to pull the head. With no ventilation the top end will crud up just the way yours did. Clean it and you should be fine. If you want to run the wet/dry compression test. If the test is good then leave it together and clean it.
Thanks to all replies! The jeep is back up and running. Here's what I did.
1. Took valve cover off.
2. Cleaned off top of valve train best I could with carb cleaner.
3. Cleaned valve cover and baffles with carb cleaner.
4. Drained oil and ran kerosene thorough top of the valve train and let it run out the bottom of the oil pan.
5. Put it all back together.
6. Put 4 1/2 quarts of cheap oil and filter on, the. Put to cans of seafoam motor treatment in.
7. Started jeep and put about 40-50 miles on it.
8. Drained oil until none coming out. Left the bleeder but off the oil pan and poured cheap oil into the valve cover I until clean oil was coming out the bottom.
9. New filter, 5 quarts moible 1 and 1 quart Lucas oil stabilizer.
10. Jeep runs great no oil blow back!
Sounds like you've got it licked there, good deal. By looking at the picture it would appear you're getting out there and enjoying your Jeep. If I can offer a little advice based on the photo, when you get back from deep water crossings etc be sure to grease everything to push out the water trapped in the u-joints etc., plus check your trans, transfer case, and diff oils for level and water contamination. Oil seals are primarily designed to keep oil in, but not so much for keeping fluids out, it's time well spent and cheap insurance.
If it wasn't done the hard way, I didn't do it.