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Old 03-07-2010, 12:28 PM   #1
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Question Should I be concerned....

...about this oily residue on my engine? Where's it coming from and why is it there? Thanks.




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Old 03-07-2010, 12:37 PM   #2
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looks like the PCV valve is leaking oil. you can just replace it for about 20$ give or take. and its not hard to do. just twist and pull it out.

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Old 03-07-2010, 12:39 PM   #3
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This is pretty normal and no worries. The gasket may be dry or hardened and not sealing like it did when it was new.
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Old 03-07-2010, 12:51 PM   #4
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Sorry for the dumb question but I don't know squat about working on cars other than changing my own oil....so on on my '04 which has the 4.0 I-6, do I just disconnect the vacuum hose and unscrew the PCV valve to replace it?
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Old 03-07-2010, 12:56 PM   #5
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yeah if you want to replace it.

but doclouie is right, i wouldnt worry about it too much. if you get oil in your air filter then it needs to be replaced for sure.
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Old 03-07-2010, 03:40 PM   #6
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I'm not certain, but I don't think the TJ 4.0 has a pcv valve. I would'nt worry about the small amount of oil, especially if there are no oil spots on the ground. My valve cover looks pretty much the same.
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Old 03-07-2010, 07:14 PM   #7
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I'm not certain, but I don't think the TJ 4.0 has a pcv valve. I would'nt worry about the small amount of oil, especially if there are no oil spots on the ground. My valve cover looks pretty much the same.

Correct, NO PCV Valve. Constant crankcase ventilation.

All of our 4.0's look like this, unless you're really picky, and you wipe it off all the time. This is normal, Its just a dirt collector.
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Old 03-07-2010, 07:34 PM   #8
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oh well i learned something new today, didnt know they didnt have a pcv valve
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Old 03-07-2010, 09:12 PM   #9
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Correct, NO PCV Valve. Constant crankcase ventilation.

All of our 4.0's look like this, unless you're really picky, and you wipe it off all the time. This is normal, Its just a dirt collector.
PCV = Positive Crankcase Ventilation. sounds kinda like the same thing to me.

IMHO I'd change it out, its a one way valve that will cause a pressure build up inside the crankcase where there is a gasket that will not enjoy said pressure and after time start to leak on its own. then you have a leaky gasket and a leaky whatever-valve.
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Old 03-07-2010, 10:34 PM   #10
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PCV = Positive Crankcase Ventilation. sounds kinda like the same thing to me.

IMHO I'd change it out, its a one way valve that will cause a pressure build up inside the crankcase where there is a gasket that will not enjoy said pressure and after time start to leak on its own. then you have a leaky gasket and a leaky whatever-valve.
If you go to the dealer or auto parts store they will tell you there is no PCV valve for the 4.0 engine.
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Old 03-08-2010, 07:24 AM   #11
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I recently had to replace my PCV valve. NAPA could get the part, but didn't have it in stock. I ended up going to the dealer to get it. The plastic elbow piece, and the round, rubber gromet that fits into the valve cover are sold separately. It's a good idea to get both pieces, because the heat from your motor really dries everything out and makes it brittle. I paid around $5.00 for each item. (One thing from the dealership that didn't brake the bank!!!!)
Also, make sure you tell them whether or not it's the front or the back. There are actually 2 PCV valves, one on each end of the valve cover. (at least that's what my 02 has).
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Old 03-30-2010, 02:53 PM   #12
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...about this oily residue on my engine? Where's it coming from and why is it there? Thanks.



so what is this valve or what ever called? i have a 1994 yj with a 4.0 and its leaking oil on to my airfilter!!!

and how do you remove it? i thought you just twisted it a certain way and then pulled it out but i couldnt get it out today
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Old 03-30-2010, 06:32 PM   #13
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no love from the forum today
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Old 03-30-2010, 06:37 PM   #14
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Its a CCV grommet, It has a metered hile in it. No moving parts
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Old 03-30-2010, 08:25 PM   #15
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so why is it letting oil into my air filter?
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Old 03-30-2010, 08:42 PM   #16
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so why is it letting oil into my air filter?
I don't see how it could be but you have a YJ, this is the TJ forum. I don't know much about the YJ's.
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Old 03-30-2010, 10:19 PM   #17
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well they are both 4.0L same exact engine basically
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Old 03-31-2010, 12:22 AM   #18
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Yea a 4.0L (242ci) YJ is similar to a TJ is similar to a XJ, no worries there about information for the most part

The part you guys are referring to is correctly identified as a CCV (crankcase ventilation) breather. There is a PVC valve located in the rear of the valve cover, but for the most part it in itself is not serviceable and requires a new valve cover most of the time.

The CCV valve is simply a breather part in the front that is replaceable by pulling the tube and wiggling the part out.

Check out

http://jeep.off-road.com/jeep/articl....jsp?id=257985

for complete info including new part numbers. Shouldn't cost $20 for the whole assembly.
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Old 03-31-2010, 09:07 AM   #19
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Mine shattered when I tried to remove it. so I got a autozone special (think Mr Gasket Brand, chrome).
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Old 04-03-2010, 11:43 AM   #20
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If I'm hijacking, I don't mean to. But I have a Banks Ram Air setup, and that elbow thingy (CCV) is broken, but even if it wasn't broken, there is no where for it to go now. What have you guys that have Banks Ram Air done with that piece? Thanks.

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Old 04-04-2010, 08:13 AM   #21
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You don't need anything but a o-ring. I had the same problem on my Jeep when new.
Just pop out the plastic elbow, install the proper sized o-ring on elbow, then reinstall.
Mine has'nt leaked again in 3 years!!
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Old 04-08-2010, 10:37 AM   #22
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If you are getting ALOT of oil in the breather box/air-tube then you might have a blow-by problem aka bad rings. You can check by taking the 710 cap off at engine idle. If there is alot of air/pressure/oil blown up and out of the hole then you may have a ring problem. Use a compression tester to be sure.

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