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Unread 08-12-2013, 08:41 PM   #1
Burnie
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Oil in air cleaner

I don't think this is normal but after I drive my 84 cj with a 258 there is oil residue in the air cleaner which is stock. Where should I start?

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Unread 08-12-2013, 10:24 PM   #2
MrElPoderozo
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Tired piston rings?

Quote:
Originally Posted by Burnie View Post
I don't think this is normal but after I drive my 84 cj with a 258 there is oil residue in the air cleaner which is stock. Where should I start?
I don't know how many miles are on the engine but sound to me like you getting something we call blow-bi (don't know if I spelled that right ) that's when the piston ring are very old OR they were installed with to much gap and they are allowing oil to pass between the piston and the block,that oil gets push back down to the oil pan in form of a mist and comes out trough the breather into the carburetor cover. I would do a compression test to begin with,this would tell you whats going on with your engine if compression test its ok then check the PCV valve. Sometimes the jeep its running good but its putting too much oil into the carburetor cover and you have to try to get it out of there cause you don't want oil mixed air and gas,so some people try the oil breather catch can method and just empty it out once in a wile, its cheaper then rebuilding the engine and at least will give you a chance to save up for it,like I said I don't know your situation but that's what I would do if I was you.That's all I can come up with for now,good luck!
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Unread 08-12-2013, 10:40 PM   #3
LumpyGrits
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Blow-by cause the engine is 'tired'.
Go to a thicker oil. I run Castrol 20W-50 year round.
LG
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Unread 08-12-2013, 10:41 PM   #4
Matt1981CJ7
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Check your PCV system.

Go here to learn more about it.

Matt
vac-pcv.png

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Unread 08-14-2013, 12:24 AM   #5
Burnie
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Thanks I'll check the PVC system first then I like the can suggestion if the PVC doesn't fix the problem.
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Unread 08-14-2013, 04:52 AM   #6
waterdowg
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How much oil? Do you have a filter attached to the PCV breather tube?
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Unread 08-14-2013, 04:10 PM   #7
Burnie
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Yes bUt it's pretty soaked from original owner it all needs to be changed out, PVC breather etc. thanks
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Unread 08-14-2013, 07:18 PM   #8
UBERK
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Quote:
Originally Posted by Burnie View Post
...I like the can suggestion if the PVC doesn't fix the problem.

As in a "catch-can"..? An air seperator from HD or Lowes can be rigged to work for <$20, however keep in mind thats just a band-aid and doesnt cure the problem.
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Unread 08-14-2013, 08:16 PM   #9
CJ51973
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Valve cover passages can clog. Use Matt's diagram and make sure everything is clean. I had an old Subaru that I made tee deal in the line going to the breather so the oil would settle in a mason jar. Then I would just pour it back in.
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Unread 08-14-2013, 08:29 PM   #10
WNC-84CJ7
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Quote:
Originally Posted by CJ51973 View Post
Valve cover passages can clog. Use Matt's diagram and make sure everything is clean. I had an old Subaru that I made tee deal in the line going to the breather so the oil would settle in a mason jar. Then I would just pour it back in.
I bet an old air compressor condensation trap could possibly function in this capacity if positioned right. A mason jar under the hood sounds...beyond rednecky and possibly tough to do in a CJ. Don't get me wrong- I love rednecky when it works!
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Unread 08-15-2013, 04:40 AM   #11
waterdowg
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Quote:
Originally Posted by Burnie View Post
Yes bUt it's pretty soaked from original owner it all needs to be changed out, PVC breather etc. thanks
I would change the oil, pcv filter and pcv valve. Then start from there to see how bad it really is. Then check it on a regular basis to see how bad it is. Your going on something from the PO. You don't know what they have done in the past to casue or fix the issue.
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Unread 08-15-2013, 11:10 AM   #12
Burnie
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Yep who knows what they did, so I'll change out PVC sys and breather and watch, I am planning a trip to my dads in Utah, from Ca in 10 days, I am trying get my dad up to some mountains, a bucket list thing he is 80, so I am hoping all goes well. Thanks for all the support.
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Unread 08-15-2013, 11:45 AM   #13
Matt1981CJ7
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A leak anywhere in the crankcase can cause oil in the breather, even if the PCV is working.

Did u read the link I posted?
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Unread 08-15-2013, 01:37 PM   #14
Burnie
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Quote:
Originally Posted by Matt1981CJ7
A leak anywhere in the crankcase can cause oil in the breather, even if the PCV is working.

Did u read the link I posted?
Yes I am checking everything, thanks I'll let you know what I find or what happens
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Unread 08-15-2013, 01:48 PM   #15
bigjoe
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Sounds like the issue my 83 Chevy PU has. My shop said most likely a cracked oil ring or worn out ring. I did the catch by-pass trick. Truck is not worth doing much more then back yard YaHaaa fixes.
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