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Old 04-24-2013, 09:55 PM   #1
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Oil in air filter.. Blow by?

Hey all. I have an 88 with the 4.2 6 cyl. I noticed oil in the air filter, quite a bit of it too. I recently changed the air filter and it was wet again. I found a vacuum seal leak caused by the charcoal
canister and fixed that (not sure it is related). I also noticed the retainer in the air filter was missing its filter so I replaced that as well. I changed the oil and noticed it was about a quart low since I changed it a month (maybe 1500 miles) later. Since I have changed the oil and replaced the air filter, retainer screen, and fixed the vacuum seal leak, it has seemed to have blown a little less oil, but is continuing to. Anyone have any ideas? Been hearing a lot about blow by.... 1988 wrangler 4.2 6cylinder 93,xxx miles. Thanks guys.

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Old 04-24-2013, 10:16 PM   #2
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I read this awhile back on an xj thing, apparently there was a system design so that the oil vapors would come up through a ccv( I believe) valve on the back of the valve cover, and it would connect into the air intake, they did it as more of an Eco friendly thing, like burn off the vapors, but instead it clogs that up and can clog up the carb

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Old 04-24-2013, 10:41 PM   #3
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The PCV system is what it is on yours so all you can do is clean the hoses you have a fresh air intake at one end of the valve cover and the other is your PCV which goes back to the carb to be burnt. The system needs to breathe so all you can do is clean everything to include any baffles inside the valve cover. Bad rings increases the blow by but it is manageable in most cases.

So clean away and I hope it decreases.
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Old 04-24-2013, 11:00 PM   #4
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Thank you both for your input. I will try to keep up on it and see if it gets any better. It'd just seem such a shame that a motor would need an overhaul or rebuild with only 93,xxx miles. Especially one in this good of shape. Any other input/ideas would be greatly appreciated! Thanks again.
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Old 04-24-2013, 11:41 PM   #5
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with only 93K it shouldn't need an overhaul. My 89 2.5L does it to but not as bad as you describe. The key is to get things clean so the vapors flow to be burnt. As the vapors cool they return to a solid which is found as oil residue in the air box.

Make sure your oil level is correct and not over filled. Make sure the rubber lines are not collapsed and clean. Change the PCV cheap part, maybe new hoses. But inside the valve cover you may have some baffle material and that may be all clogged up which may be the cause.

So valve cover gasket, PCV valve, some hose and cleaner. About an hour and clean everything up. Your oil pressure at idle should not exceed 40 psi and at speed should not exceed 75 psi. The gauges in the YJ are flaky at best so something close is good. See what that does for you and keep an eye on it for awhile.
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Old 04-24-2013, 11:46 PM   #6
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Thanks a lot. That sounds very helpful. I did replace the PCV valve recently and replaced some hoses but ill check them all. I was thinking of a valve cover gasket anyhow because there was oil building up so I thought it may be from there. Never had to do that job yet though so would be my first time. Anything I should know while taking it on?
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Old 04-24-2013, 11:55 PM   #7
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If it is a plastic cover make sure all the bolts are out I screwed mine up. Its pretty much remove and install. When tightening the bolts down just remember they aren't real large and should be torqued or tightened from inside out.

NOTE: Some 1986 4.2L and all 4.0L engines
utilize a valve cover that has a pre-cured sealer
on the cover. Install the valve cover onto the
cylinder head and torque retaining bolts to 50 -
70 in-lbs.

From the 88 FSM so may have to find a torque wrench Harbor Freight if you have one locally.
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Old 04-25-2013, 10:59 AM   #8
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Okay awesome. I've got a good torque wrench that can be put to use. How long of a job would you say this will be? Anything else I should be aware of or take care of while doing this job? I just checked the oil after receiving the actual dipstick for this motor (had to order one from a jeep dealer after finding out it is discontinued) and it showed about a quart low, and I just did the oil a week ago and drove less than 500 miles!! I'd find it hard to believe a quart of oil has escaped into the air cleaner so I'm hoping its the valve cover gasket causing this. Any other ideas about what to do or what I should look for or take care of during this job would be appreciated. Thanks again, you've been very helpful.
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Old 04-25-2013, 11:30 AM   #9
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Witht the valve cover off you may find a mess so don't get discouraged hopefully you won't. I had miles of sludge and it was a little disheartening at first. I used paper towels to plug all the holes on the top of the head so I could clean it up.

There should be no adjustments to the rockers so just look everything over. Clean up what you can and if the valve cover gasket was leaking you will be good to go after. About an hour and you should be done. Pretty straightforward work nothing cosmic.
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Old 04-25-2013, 04:54 PM   #10
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You've been a huge help! I will try to keep you posted on my progress. I should be doing it this weekend or next. Thanks again I really appreciate it.
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Old 04-25-2013, 05:01 PM   #11
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can you pull the part that the breather slides into the valve cover? I tried to pull it out. didn't want to break any thing. seems like there is a screen there and mine has some gunk on it is line to clean. mine has a hose coming out if valve cover. filter is in air filter housing.
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Old 04-25-2013, 05:09 PM   #12
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I'm not 100% sure which you are talking about but if I'm right about which, I did clean that out. I've noticed quite a bit of oil after getting under the vehicle so I'm thinking there's more work to be done in relation to all the oil I'm losing. Maybe an oil pan gasket? Not quite sure. Going to have to really investigate it this week if I ever get the time!!!
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Old 04-25-2013, 07:10 PM   #13
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the one closest to the fire wall on the valve cover. it has a hose and elbow coming from air cleaner into it. the part connected to valve cleaner is the one I want to pull out. the hose and elbow come out but there is still a part in the valve cover that looks like it has a screen in it. I want to pull out the screen and clean it.
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Old 04-25-2013, 07:56 PM   #14
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Remove the valve cover and then clean it up, along with checking the hoses for debris and that they don't collapse when its running.
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Old 05-04-2013, 06:53 PM   #15
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Hey guys. I just wanted a little advice. I am losing a lot of oil and someone mentioned it could be my rear main seal gasket. I've heard that before so I was wondering if anyone had any input about that. I lose about a quart a week or so and I've noticed oil dipping from the front of my tranny when I get under it. Any ideas? I'm changing the valve cover gasket and oil pan gasket tomorrow so I was just looking for any input before I get my hands dirty. Thanks!
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Old 05-04-2013, 07:02 PM   #16
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It is not that easy. Think about in oil leak in terms of gravity and airflow in the engine bay. Where it collects and drips off is not always the source of the leak. Before I jack the motor and pull the pan to do a rear main I would be looking everywhere else. I know it is a popular leak but its also a lot of work. So look everywhere first.
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Old 05-04-2013, 07:06 PM   #17
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Okay cool. I was told the same thing by someone else. I'm sure the oil leaking from the valve covers gets blown to the rear of the motor quite a bit so maybe it is coming from there. It seems like the valve cover gasket will be fairly easy compared to the rear main seal. Any input about the oil pan gasket or should I just skip that for now and see how much of a difference the valve cover gasket makes? Thanks again.
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Old 05-04-2013, 07:52 PM   #18
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Yeah bypass all and get the valve cover gasket done. Clean everything up and then check again. Best bet and easiest about an hour.
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Old 05-04-2013, 08:12 PM   #19
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Thanks chief ill let you know how I make out tomorrow. Ill do the valve cover than drive it a bit and see how much oil, if any, I'm continuing to lose. Thanks again.
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Old 05-04-2013, 11:22 PM   #20
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Quote:
Originally Posted by jokerchief462 View Post
The PCV system is what it is on yours so all you can do is clean the hoses you have a fresh air intake at one end of the valve cover and the other is your PCV which goes back to the carb to be burnt. The system needs to breathe so all you can do is clean everything to include any baffles inside the valve cover. Bad rings increases the blow by but it is manageable in most cases.

So clean away and I hope it decreases.
This may be a stupid question, but what do you use to clean the hoses? I just replaced my PCV valve, and the hose attached to it was very oily. Do I need to clean inside the hose too? The little filter piece that sits inside a box in the air filter case was also very oily and I replaced that too (along with the air filter). My Jeep failed the smog test, so I'm trying all the cheap fixes hoping that its not the catalytic converter. O2 sensor is next.
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Old 05-04-2013, 11:27 PM   #21
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Complete Jeep newb here but after a rough day of trail riding/mudding my 2.5 was leaking oil from what appeared to be the same area. I did some digging and learned some common areas of leaks. If the valve cover isnt the source of the leak - the next lowest spot i checked was the oil pressure sender. $35 part, a 6 minute youtube video, and 30 mins of time later - i had a new oil pressure sender in and my oil leak was gone completely.

Just my 2 cents. It may not be the fix but its worth checking prior to digging too deep. For reference (on my 95 at least...) it is located next to the oil filter.
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Old 05-04-2013, 11:40 PM   #22
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Complete Jeep newb here but after a rough day of trail riding/mudding my 2.5 was leaking oil from what appeared to be the same area. I did some digging and learned some common areas of leaks. If the valve cover isnt the source of the leak - the next lowest spot i checked was the oil pressure sender. $35 part, a 6 minute youtube video, and 30 mins of time later - i had a new oil pressure sender in and my oil leak was gone completely.

Just my 2 cents. It may not be the fix but its worth checking prior to digging too deep. For reference (on my 95 at least...) it is located next to the oil filter.
I don't think I have a current oil leak, my oil pressure sending unit was replaced a couple of months ago. The engine was rebuilt a year ago, so I don't think my valve cover is leaking. I think the dirty PCV valve, hoses and filters were put back on by the guy who sent out the engine for rebuild (that's another story). The air filter itself wasn't bad and had no visible oil. But something is causing the carb to run too rich, which is why it failed smog. Tomorrow I'm going to change the O2 sensor and check the adjusting screws on the carb.
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Old 05-05-2013, 08:13 PM   #23
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Hey chief wanted to update you. I replaced the valve cover gasket. Fun project. My stubborn father broke off one of the bolts to the valve cover so it looks like I have more work to do lol shouldn't be an issue though. There is no leak from what I can tell so far from the valve covers but still dripping from the tranny/rear of oil pan which is leading me to believe it is either the oil pan gasket or the rear main. Someone suggested this blue devil additive that supposedly stops rear seal leaks but I am a bit hesitant about it. Next choice is the oil pan gasket I suppose. I just know I'm still losing quite a bit of oil from under there and I am still getting some in the air filter. Fun fun. 4.5 to 6 quarts of oil I've read for the oil capacity in the 4.2 6cyl... I doubt I'm putting too much in but someone said that's a possibility. I has to order a dipstick from a jeep dealer and it has been discontinued so I was happy to find one. Wasn't trusting the universal one that was in there already. Did the oil change recently and put just about 6 quarts in maybe a bit less and it was right at full. Hoping I figure these issues out soon as oil is expensive hahaha thanks all for the help any input ???
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Old 05-05-2013, 08:15 PM   #24
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Oil pressure sender located in same place on the 88 4.2 liter? Forgive my ignorance lol just want to try everything especially cheaper fixes
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Old 05-05-2013, 09:35 PM   #25
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Your on the right track. Plus you are getting to know your Jeep better. Just keep working at it will all be good soon.
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Old 05-05-2013, 11:00 PM   #26
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Yes oil pressure sending unit is next to the oil filter attached to the block... Atleast it is on my 87..4.2
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Old 05-06-2013, 02:58 PM   #27
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Okay Bill thanks a lot I appreciate it ill try to replace that because a lot on oil seems to be coming from that side. Always a puddle under the jeep under the passenger side around that area. Wonder if its from that? Thanks again chief. You've been very helpful.
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Old 05-06-2013, 03:20 PM   #28
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Mine was also leaking there but it was the brass fitting on the tube going to my gauge... 7 dollar part at schucks

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