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post #1 of (permalink) Old 03-01-2012, 12:48 PM Thread Starter
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Oil leak

I have a 03 TJ and a month ago I noticed a bad leak. It was on bell housing and oil pan and looked like it was coming from the rear main. So I replaced the seal and it's still leaking from what looks to be the same spot. Some days it leaks worse than others. It's been a month and I have noticed on dipstick I am losing a good amount. The head on the engine and valve cover are oily. Forums say valve covers leaking act like a rear main seal. But would it use that much oil is what I'm wondering. Does any one have any tips for me. Thanks.
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post #2 of (permalink) Old 03-01-2012, 05:12 PM
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Yes, the valve cover can leak a lot. Yours is probably plastic. They can leak if the bolts are too loose, and crack and warp if too tight. You should wait for someone with experience with the plastic covers to chime in. Mine is stamped steel, and I just have to tighten it when it leaks.

Of course, Jeeps are supposed to leak a little. When they stop you know they're out of oil.

EVERYTHING's easy for the guy who doesn't have to do it.
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post #3 of (permalink) Old 03-04-2012, 04:41 PM Thread Starter
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Mine is also metal so I will try tightening it. Does it leak down the bell housing also? It looks just like what the rear main leak did. Thanks.
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post #4 of (permalink) Old 03-04-2012, 06:01 PM
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Don't overlook the possibility that the rear main seal is leaking again. It's not unusual to have to do it twice, just considering the first time ... practice.
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post #5 of (permalink) Old 03-05-2012, 05:10 AM
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The valve cover often leaks at the back and dribbles oil down the bell housing. If the screws are tight you may need a new gasket. The old ones were cork, and once they leaked for a while it was difficult to ever get them to stop. Most now are rubber, and they can almost always be made to stop with a little tightening.

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post #6 of (permalink) Old 03-05-2012, 08:28 AM
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Quote:
Originally Posted by jeeper89 View Post
... and valve cover are oily.
Where is the valve cover oily?

How’s your PCV system?

Clean the engine and then see where the oil is coming from.

ALL engines have blow by. This causes pressure in the crankcase and under the valve cover which will blow oil out anywhere it can find a gap.

Over tightening the valve cover is the WORST thing you can do, especially the stamped metal type. The gasket lip distorts and the leak gets worse.

There are 10 kinds of people in the world.
Those who understand binary and those who don't.
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post #7 of (permalink) Old 03-05-2012, 11:12 AM
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Taz is right. I should have emphasized "a little tightening."

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