rubiconron Posted August 22, 2007 Share Posted August 22, 2007 Since I'm pretty new to the "older" 4.0s...... How normal is this? Oil is everywhere on the drivers side underneath. The vent (PCV) on the rear of the valve cover is leaking badly. I can't seem to locate a new grommet for that. The dealer wants more than $20 for a little piece of rubber. Here's a pic. Image Not Found Thanks, Ron Link to comment Share on other sites More sharing options...
JeepcoMJ Posted August 22, 2007 Share Posted August 22, 2007 *shrug* it's worth the money Link to comment Share on other sites More sharing options...
FxRacing282 Posted August 22, 2007 Share Posted August 22, 2007 high temp silicone works magic, just be sure to have the engine all cleaned up and let it cool for about 12 hours. Link to comment Share on other sites More sharing options...
DirtyComanche Posted August 22, 2007 Share Posted August 22, 2007 Help! makes the part. It's just not one that is stocked normally, but can be ordered. I think. Or just buy the dealer part. You think $20 is bad. I payed more like $40 for it. Then get some gunk engine cleaner and spray the $#!& out of that thing. Link to comment Share on other sites More sharing options...
87manche Posted August 22, 2007 Share Posted August 22, 2007 napa has those parts, the whole 97+ CCV upgrade can be done for about $70. Link to comment Share on other sites More sharing options...
rubiconron Posted September 28, 2007 Author Share Posted September 28, 2007 I got the part from Orielly's about 2 weeks ago. It helped some but I still have a BIG problem. My entire driver's side frame rail is covered with oil just behind the airbox. My air filter is FULL OF OIL. I have to go buy a new one now it will hardly even move. It looks like oil is coming from the front hole (very bottom of the picture) in the valve cover and being pumped into my airbox. Any suggestions on how to fix this problem? Thanks again, Ron Link to comment Share on other sites More sharing options...
500 MJ Posted September 28, 2007 Share Posted September 28, 2007 Did you clean the plastic tube out? Link to comment Share on other sites More sharing options...
LocoJeeper Posted September 28, 2007 Share Posted September 28, 2007 Check out this link: http://www.naxja.org/forum/showthread.p ... ght=blowby Link to comment Share on other sites More sharing options...
skimore11 Posted September 28, 2007 Share Posted September 28, 2007 I read all 4 pages at NAXJA. Mostly talking about buying the parts or fabbing some up. Seems there is some baffles in the valve cover that could stand to be cleaned but ....Is it possible that much oil is going through the filter box and down to the wheel well? I have the same exact problem. I sealed up the leaks at the top end and now my drivers side suspension and fender well are covered with oil. I was gonna build my new bumper this weekend but I think I need to fix this first. I am going through a quart of oil every 200 miles (2 days). I was thinking maybe the pressure is enough that its causing a leak under the exhaust where I can't see??? Link to comment Share on other sites More sharing options...
87manche Posted September 28, 2007 Share Posted September 28, 2007 yes, when my CCV tube was accidently left off, I drove about 50 milea at highway speed. When I got there it was a quart low, and there was oil dripping onto the top of my tire when I stopped, and oil all inside the fender. Link to comment Share on other sites More sharing options...
LocoJeeper Posted September 28, 2007 Share Posted September 28, 2007 Do you mean that you somehow plugged those hoses that are coming out of your valve cover? Link to comment Share on other sites More sharing options...
87manche Posted September 28, 2007 Share Posted September 28, 2007 ok, I think that we need to get some basic understanding of the CCV system in this thread. The grommet and the hose in the rear are a metered vacuum leak. That hose is supposed to suck all of the vapors from the valve cover back into the intake. The front, larger hose is to provide filtered air from the airbox. What happens is this: The rear CCV line get's plugged/the grommet stops sealing what have you, the system then reverses itself and the hose up front starts sucking out the vapors. Since that hose is so much larger, it also sucks up a bunch of oil. You've got a few possible problems that cause this. The most likely is that all of the CCV parts need replacing. The second most likely is that the tower/splash guards are all gunked up and interfering. Take the valve cover off and clean it. The third and most unhappy situation is that your rings are worn and combustion chanber pressures are pressurizing the crankcase, forcing the oil out, only way to fix that is a rebuild. So, do a compression check dry and wet. That will tell you what shape the rings are in. If they're in good shape, replace all of the CCV parts and it will likely be fixed. This advice of course hinges on the fact that you have tested for and eliminated any other intake leaks. Link to comment Share on other sites More sharing options...
speed_racer Posted September 28, 2007 Share Posted September 28, 2007 Every Jeep that I've seen with that issue has blow-by. Sure, that 4.0 can probably crank out many more miles, but you'll need to get the updated ccv system, and check your oil AND air filter OFTEN. Something had to let the stuff get up there to clog the piping/splash guards ;) Link to comment Share on other sites More sharing options...
87manche Posted September 28, 2007 Share Posted September 28, 2007 it's called time. The CCV system is supposed to deal with the crankcase fumes, and those are a normal part of any engines operation. Just figure that all of these trucks are almost 20 years old, the vacuum systems are falling apart and all of the rubber stuff under the hood is extremely suspect at that age. I thought my 4.0 was on it's last legs because of my blowby problem, but a compression check showed nominal compression across the board. Replacing the CCV parts was a complete fix for me. Do a compression check, it's the best way to tell, unless of course you have a leak down rig. Link to comment Share on other sites More sharing options...
skimore11 Posted September 28, 2007 Share Posted September 28, 2007 Ron, Sorry about the hi jack. I have a new hose and grommets in the back going to the intake. I took the tube off and cleared it with the air compressor. No change. I will have to take the compressor to the rest of the ports. As well as pulling the valve cover. Anyone have pictures or know of any of the inside of the cover? So by sealed up I meant new hoses in the back and RTV around the front grommet since the "Five Star" :roll: dealer here couldn't figure out how to order it. Link to comment Share on other sites More sharing options...
LocoJeeper Posted September 28, 2007 Share Posted September 28, 2007 So by sealed up I meant new hoses in the back and RTV around the front grommet since the "Five Star" :roll: dealer here couldn't figure out how to order it. Gotcha... just making sure that you didn't plug those hoses. 'cause that would've explained the miscellaneous leaking that would've developed. An engine's gotta breath, ya know. Link to comment Share on other sites More sharing options...
rubiconron Posted September 28, 2007 Author Share Posted September 28, 2007 I don't think the thread got hijacked..... This is all very good information. I will be working on getting my hoses cleaned or replaced. I'll also do a compression check on mine. I've got new plugs for it so I might as well check it. I'll be checking back for updates!!!!! Thanks, Ron Link to comment Share on other sites More sharing options...
cromanyak Posted September 28, 2007 Share Posted September 28, 2007 Someone mentioned updating the CCV system. Could someone explain what the update is, and what parts to ask for? Link to comment Share on other sites More sharing options...
jtdesigns Posted September 29, 2007 Share Posted September 29, 2007 Someone mentioned updating the CCV system. Could someone explain what the update is, and what parts to ask for? + 2 Any part numbers or better yet instructions??? That is for the update to 97-up parts, right? Link to comment Share on other sites More sharing options...
jtdesigns Posted September 30, 2007 Share Posted September 30, 2007 bump for answers?? Link to comment Share on other sites More sharing options...
swilson Posted November 22, 2007 Share Posted November 22, 2007 I just installed all the new ccv lines from Napa.($50.00 and three weeks delivery to canada) Before, I would go find some oil in my air filter and would have to add a litre between oil changes. As soon as i installed the new ccy tubes (correctly) I have run four tanks of gas and have had to add one litre of oil at every fill up. Is there something else that i need to do. I have not removed the valve cover yet and cleaned it. Could this be the reason? Link to comment Share on other sites More sharing options...
LocoJeeper Posted November 22, 2007 Share Posted November 22, 2007 Haven't done the cleanup yet on my 89 (needs it) but everything i've read says you really are only doing 49% of the job if you don't pull the valve cover and clean it out. That's why its gets "crabbed up" to begin with. Good luck. God Bless, Ben Link to comment Share on other sites More sharing options...
Bansheemanche Posted November 22, 2007 Share Posted November 22, 2007 Aww so I need to do this too then. I got all new tubing and still get some oil on my airfilter, not to the extent I did before but still get some. The cleaning should fix this as I have heard you need to buy a whole new valvecover. Link to comment Share on other sites More sharing options...
Eagle Posted November 22, 2007 Share Posted November 22, 2007 You do not have to buy a new valve cover. Link to comment Share on other sites More sharing options...
swilson Posted November 28, 2007 Share Posted November 28, 2007 Does anyone have a pic of the inside of the valve cover?? Link to comment Share on other sites More sharing options...
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