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Stock 1995 - 2001 Explorers Questions related to non-modified 1995-2001 Explorer, Mountaineer, Ranger and '02+ Sports and Sport Trac. Problem solving, maintenance, TSB, service bulletins, owner reviews, specifications.

Oil leak on exhaust manifold bolt

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Old 05-13-2013, 02:44 PM   #1
10pound
San Diego CA
2001 Explorer
 
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Oil leak on exhaust manifold bolt

Hi everyone and thanks in advance for reading, I sincerely appreciate any insight you can offer into my problem.

My wife has a 2001 Explorer with the 4.0 v6. For the past few months, after driving it, one would smell that distinctive aroma of oil sizzling into vapor coming from the engine. Oil level never dropped and it wasn't that big of an issue at the time, so I didn't look that hard for a leak. Last night, I drove it to the 7-11 around the corner and when I returned, I noticed vapor/smoke coming from under the hood. This morning when I could actually see something, I hosed the motor down with degreaser and water, started it up and waited for the aroma and vapor to return. I didn't have to wait long. It appeared as though oil was dripping down onto the exhaust manifold on the driver's side. Closer inspection shows the oil emanating from the lower exhaust manifold bolt for cylinder 6 (the rearmost cylinder on driver's side). At first I thought that perhaps the PCV valve was leaking some oil down onto the bolt but I couldn't find anything other than dirt around the PCV valve. I cleaned it all off again, especially this exhaust manifold bolt, started it back up and got underneath the vehicle where I could watch this bolt. Sure enough, I watched it go from clean to oily within minutes. I could actually see as the oil began to well up to a point where it would then drip down onto the manifold right where it connects to the catalytic converter.
Here is an image showing the bolt/threads with a drop of oil welled up on the end of it:



Anyone have an idea of what I am facing here? I run synthetic 5w-30 through it and change it regularly. Any insight, assistance or opinions are much appreciated.

10Pound
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Old 06-14-2013, 10:55 PM   #2
lobo411
1996 Explorer 4.0 OHV
 
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Originally Posted by 10pound View Post
Anyone have an idea of what I am facing here? I run synthetic 5w-30 through it and change it regularly. Any insight, assistance or opinions are much appreciated.

10Pound
How about the valve cover gaskets? I just installed new ones on my 96 4.0 tonight...sadly, mine were actually in like new condition after 7 years, and it wasn't till I had the car torn to pieces that I figured out it was the PCV valve leaking the whole time.
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Old 06-14-2013, 10:59 PM   #3
nitrodude
97 ford explorer
 
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I've got the same leak on my 97.
Hopefully one of us finds the culprit!
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Old 06-29-2013, 07:50 PM   #4
nitrodude
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Any luck finding the leak 10pound?
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