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Unread 02-04-2013, 05:52 PM   #1
JackNCoke
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1993 YJ Wrangler 
 
Join Date: Feb 2013
Location: Jacksonville, NC
Posts: 28
Need Help: 93 YJ

Hey everyone Im new to the jeep world. I recently bought a 93 wrangler with the 4.0L. I went to change the air filter out, and I noticed the air filter housing was completely soaked with oil. And I mean SOAKED! So cleaned it all out and replaced the filter. I realized that all of the oil had come from the breather hose that leads to the valve cover. So I disconnected the hose and put a separate breather filter on top of the valve cover. Then I took the jeep for a spin and smelled burning oil. I popped the hood and there was oil everywhere. It had been coming out of the new breather filter on the valve cover. Can someone tell me what is wrong? I put the correct oil in the jeep and the correct amount. Please help.

img_1863.jpg  
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Unread 02-04-2013, 06:43 PM   #2
Que89YJ
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1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 14,987
You have either a bad pcv valve or bad rings. Start with the PCV valve. Some people suggest pulling the valve cover and cleaning underneath the valve cover to allow it to breath. If it doesn't fix it you can run a compression check to see if the compression is allowing blow by.
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Unread 02-04-2013, 07:36 PM   #3
alc60560
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1992 YJ Wrangler 
 
Join Date: Jan 2007
Location: IL
Posts: 132
You actually have what the call a ccv valve. It is at the back of the valve cover. The hole in it is eather pluged or you have a vacuum leak. The boots for the vacuum might be worn out or dry rotted. That is where you should start. If there is a problem the crankcase cannot vent properly. Good luck. If you can take some pics of the vacuum line connections and post.
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Unread 02-04-2013, 08:57 PM   #4
JackNCoke
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1993 YJ Wrangler 
 
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Thanks for the replies. I checked the CCV/PCV line leading to the intake manifold and it was clear of any stoppages. The line looks alright, but ill try changing it. I don't understand how that little hose being clogged could cause the blow back of oil that is in my air filter housing. I mean there is a LOT of oil coming though the breather hose.....Just took the valve cover off a min ago and the rockers are extremely
dirty. Lots of built up oil. Is this normal for a 93 YJ with 90k miles? The valve cover is bad also. What is the best way to clean the rockers, springs and push-rods?
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Unread 02-04-2013, 09:00 PM   #5
JackNCoke
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Here are some pictures of the Valve cover and rockers
img_1887.jpg   img_1886.jpg   img_1885.jpg   img_1883.jpg  
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Unread 02-04-2013, 09:11 PM   #6
cstone94
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1995 YJ Wrangler 
 
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I'm at a loss for words on that valve-train and valve cover.....
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95' YJ - Warn Bumpers/Tire Carrier/Winch - 2.5L - 6" Skyjacker Suspension Lift - 4.10's - Locrite Locker - Dana 35/30 - 35" BFGoodrich KM2's

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Unread 02-04-2013, 09:46 PM   #7
140mower
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1989 YJ Wrangler 
 
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Poor thing looks like it's had a lot of very short trips on it, (as in the previous owner should have walked to the corner store a couple times) and maybe one or two oil changes in it's 21 year life.
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Unread 02-04-2013, 09:56 PM   #8
randall979
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1995 YJ Wrangler 
 
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I'd start by changing both pcv and ccv and getting the oil changed every 800-1000 miles and see about getting some sort of oil detergent to run through it. Like maybe seafoam engine flush.
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Unread 02-05-2013, 06:04 AM   #9
JackNCoke
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I think that I'm am going to take the head completely off and have it soaked in some type of mineral sprites. Than I will get ahold of my dealer and order a new CCV hose. Due to the fact that the boots on the one right now are dry rotted. Thanks for the replies. I'll post back once I figure something out, or come across another problem. Thanks.
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Unread 02-05-2013, 06:13 AM   #10
Que89YJ
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1989 YJ Wrangler 
 
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If you are going to pull the head you can make your life easier by pulling the drivers fender to get at the manifold bolts on the side. Believe me 1/2 hr. work wil save you tons of cash you end up dumping into the cuss jar.
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Unread 02-05-2013, 06:17 AM   #11
alc60560
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1992 YJ Wrangler 
 
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There is a small hole in the ccv valve that has to be clear
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Unread 02-05-2013, 06:40 AM   #12
Chrisnvegas
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1992 YJ Wrangler 
 
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Don't forget the oil pan. If the top end looks like that the bottom end will too.

Pull the top end and oil pan and get ready for a messy job.
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Unread 02-05-2013, 06:53 AM   #13
JackNCoke
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1993 YJ Wrangler 
 
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I will for sure keep it in mind to take the fender off when pulling the head. Thanks. And Yes I have already taken the oil pan off and it didn't look to bad. The crank and bearings had oil on them but no signs of build up. It looks like the bottom end has had proper oil changes, while the top end looks like it had never been changed. I'm thinking the oil drain holes in the bottom of the head are not allowing oil to drain properly. And cause oil build up on the rockers and inside the value cover, because the oil pump keeps pumping oil to the top end and it has no where to go it causes the blow back that I'm am experiencing. Does this theory make sense? And is it worth me pulling the head to clean? Thanks everyone for the feedback.
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Unread 02-05-2013, 06:55 AM   #14
JackNCoke
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Forgot to mention I did clean the oil pan completely when it was removed.
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Unread 02-05-2013, 07:37 AM   #15
Que89YJ
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1989 YJ Wrangler 
 
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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.
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