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Old 02-04-2009, 07:43 PM   #1
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Oil in the air filter

I just bought a 89 wrangler and there is oil in the air filter. I changed the pcv valve while the old one was good. I know the oil is coming from the crank case filter. My question is why and if the new one does the same what would be wrong with it.Thanks

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Old 02-04-2009, 10:48 PM   #2
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Um Doc would be your best bet to ask hes the master of Jeep issues, but there are other threads about this

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Old 02-05-2009, 01:14 AM   #3
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I have a 1989 wrangler also and had this same problem.
After talking to a mechanic friend of mine few years ago,
he told me the same thing that is on this site :
ALLDATA -- Jim Grant's Tech Tips -- 88 Jeep Wrangler, Oily Breather
Helped me with the problem. Also have seen a few guys
run the hose that goes to the air box, to an after market
fitting on the fresh air tube at the top of the TBI.
The problem can also be from using a spong or gauze type
filter which let in fine dust which does damage to cyl walls
and rings.
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Old 02-05-2009, 04:07 PM   #4
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How much vaccum pressure should the PCV valve have?
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Old 02-05-2009, 07:09 PM   #5
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There is a possibility that contact between the piston rings and cylinder walls is less than optimal. Causing pressure from the ignition stroke to pass by the rings and entering the crank case and causing oil to spray out into the air box.
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Old 02-05-2009, 07:10 PM   #6
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Or in mechanic speak possibly need new rings
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98% of people when they are about to go into the ditch say "oh shit!" The other 2% are Minnesotans and when we are about to go into a ditch we say "Hold my beer and watch this shit!"
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Old 02-05-2009, 07:13 PM   #7
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Or in mechanic speak "possibly need a rebuild".
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Old 02-07-2009, 08:13 PM   #8
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Quote:
Originally Posted by K.T. View Post
There is a possibility that contact between the piston rings and cylinder walls is less than optimal. Causing pressure from the ignition stroke to pass by the rings and entering the crank case and causing oil to spray out into the air box.
+1 hes right. thats what usually happens. just plug the "crank case vent tube" there is no pcv valve.
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Old 02-07-2009, 08:21 PM   #9
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Do not plug the pcv tube

plugging the crank case vent will cause that pressure to build up in the oil pan and blow out seals. pcv tubes cannot ever be plugged.
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Old 02-08-2009, 05:07 PM   #10
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I agree with doc, and yes new rings usually comes with a full rebuild...
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Mine: 1987 YJ 4.2 5spd soft top
98% of people when they are about to go into the ditch say "oh shit!" The other 2% are Minnesotans and when we are about to go into a ditch we say "Hold my beer and watch this shit!"
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Old 02-08-2009, 05:27 PM   #11
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Quote:
Originally Posted by 87YJWrangler View Post
I agree with doc, and yes new rings usually comes with a full rebuild...
Oh, I wasnt asking you if rings come with a full rebuild? Normally one would say you need a rebuild rather than new rings. I haven't ran into many who will tear down an engine to replace the piston rings only.
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Old 02-08-2009, 05:49 PM   #12
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Quote:
Originally Posted by jpdocdave View Post
Do not plug the pcv tube

plugging the crank case vent will cause that pressure to build up in the oil pan and blow out seals. pcv tubes cannot ever be plugged.
no no no, never put a solid plug in, one of those fancy little colorfull breather filters.
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Old 02-08-2009, 10:59 PM   #13
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KT I know I was saying the only way Id go thru the trouble of doing rings is a rebuild...
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Mine: 1987 YJ 4.2 5spd soft top
98% of people when they are about to go into the ditch say "oh shit!" The other 2% are Minnesotans and when we are about to go into a ditch we say "Hold my beer and watch this shit!"
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Old 02-12-2009, 08:16 PM   #14
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My compression is
1-131
2-135
3-135
4-137

oil looks good but there is some milky in the valve cover

valve cover baffle where the crankcase breather goes came off need a new one
someone was telling me that the crankcase breather would come apart at the top and would cause the oil to flow back through and cause a milky valve cover. anyone know where i could get one? I cant find one anywhere even jeep don't sale them. I don't want to use one of them little K&N filters cause of the oil smell in the cab.

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