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Old 07-07-2018, 03:23 PM
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Air Cleaner Housing oily

87 YJ with 4.2L. New to me by 2 days. Checking everything before heading out into the woods for some fun. Pulled the air cleaner cover off and noticed that the inside of the housing has a film of oil all over it. Is this an oil bath system, or some trail trick that people do, or.............................................

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Old 07-07-2018, 03:53 PM   #2
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Common... comes frome breather hose to valve cover...

Blowby overcomes the ccv at high throttle and sends oil vapor into the intake

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Old 07-07-2018, 06:32 PM
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Originally Posted by Gottagofast View Post
Common... comes frome breather hose to valve cover...

Blowby overcomes the ccv at high throttle and sends oil vapor into the intake
That's what I figured, but wanted to ask anyway. I wiped it out and cleaned things up, and won't worry about it in the future.
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Old 07-07-2018, 06:37 PM   #4
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I drive my yj hard and do a lot of interstate driving.... I have to change my air filter when it gets oil soaked
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Old 07-11-2018, 06:39 PM   #5
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I have the same problem with mine. When the filter gets oil soaked I loose power. It seems to happen all of a sudden.
I've installed a new PCV valve and checked the plumbing for fit and function.
It all seems to be connected properly. Make sure your valve cover, front timing cover and oil pan aren't leaking. If any one of them are leaking, oil goes out, but air can get in and thwart the PCV valve. Good vacuum at the carb will help to prevent oiling the filter.

I'm pushing 200K miles, so I'm not too worried about a bit of oil consumption. I have a replacement 4.2 under construction that should be (hopefully) ready for early spring 2019. I don't remember the exact numbers, but compression on my #6 cylinder is low.

Good Luck, L.M.
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Old 07-11-2018, 06:46 PM   #6
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I'm curious what grade oil you guys run in the summer with the blow-by problem? If you haven't tried a 40 grade it might be worth a shot. And/or add a bottle of Schaeffer's #132 to the oil during the summer, it can help in some cases.

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