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Unread 10-06-2013, 01:56 PM   #1
Colton5419
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2004 WJ 
 
Join Date: Oct 2012
Location: Niagara Falls, New York
Posts: 49
Oil Leaking Top of 4.0L

I have been noticing that oil is leaking from the bases of the two hoses on top of my 4.0L engine - I have been just shrugging it off and keeping an eye on it, I mean this thing has leaked oil since I got it with 61,000 miles. (now at 68,800).

First oil change I had a shop do, and it leaked then too, but this time I did it and it still does this.

What would cause this? I was thinking maybe I put too much oil in (manual said 6 quarts so I put in 5.5 and checked the dipstick; it looked over, so I drained even more from the bottom.. still said overfull on the dipstick but I just don't see how? I'm positive 5 quarts or more drained because I put the used oil in the 5.1 quart container and it was more full than when new.

My engine is nicely coated with mud from a recent off-road excursion after a rain storm; so now it's very easy to see where the oil is running down.

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Unread 10-06-2013, 02:47 PM   #2
coloradowjowner
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2002 WJ 
 
Join Date: Jan 2013
Location: Fort Collins, Colorado
Posts: 209
My gaskets/grommets that the hose fittings go into we're dry and unable to seal against the valve cover. I purchased some new ones and the blow by stopped.
Do be aware the plastic fitting that goes into those grommets will most likely break. This will made me have to by the whole vacuum hose set up for there. It was pretty cheap like $30 or something near that and the dealership had to order it. So keep that in mind before you go trying to remove anything that might break.
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Unread 10-06-2013, 03:51 PM   #3
nickblack
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Join Date: Dec 2010
Location: bridgewater, nj
Posts: 739
You can buy the 2 plastic grommets for $2 at Autozone. Maybe the holes in them got clogged up making the crankcase unable to vent. Replace them. Make sure the right one goes in the right hole, they are different.
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Unread 10-06-2013, 03:57 PM   #4
Colton5419
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2004 WJ 
 
Join Date: Oct 2012
Location: Niagara Falls, New York
Posts: 49
Anyone have a link to them?

I don't know exactly what the parts would be called that I would need to buy - I'm trying to find it on autozone.com

And when replacing them, what are the steps involved? Do I just pull them out?
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Unread 10-06-2013, 03:58 PM   #5
new2site
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Join Date: Jan 2012
Location: Orange county, CA
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I had them leaking and my valve cover gasket...replaced all three at once... you might want to do all three as well (valve cover off of engine) being those are a nightmare trying to take out without them crumbling (which of course pieces will fall down on top of valves).
And getting replacements in without damaging them was tricky as well...had to carefully/strategically hammer with wood block.

This guy has his technique with replacing them on engine:

http://www.jeepforum.com/forum/f310/...ite-up-733669/
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Unread 10-06-2013, 04:19 PM   #6
new2site
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2002 WJ 
 
Join Date: Jan 2012
Location: Orange county, CA
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CCV Elbow with fixed orifice: #47057 (This one I believe is the correct but "will come up" as incompatible with WJ's ...think that's an error in auto parts system..when in reality is compatible..you'll have to verify this)

Fresh Air Elbow: #47079

Grommets: #42344
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Unread 10-06-2013, 04:28 PM   #7
new2site
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If you decide to do the valve cover gasket while you're at it ..see video at 6:00 below for how cables come off throttle body:

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Unread 10-06-2013, 05:29 PM   #8
Colton5419
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2004 WJ 
 
Join Date: Oct 2012
Location: Niagara Falls, New York
Posts: 49
Awesome video, thank you!

Would this be a potential area for slight loss of MPG?
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