1989 Jeep Cherokee Pioneer 4.0L Oil Leak. - JeepForum.com
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Unread 05-13-2010, 08:36 PM   #1
Calebxx12
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1989 Jeep Cherokee Pioneer 4.0L Oil Leak.

I have a 1989 Jeep Cherokee Pioneer 4x4 4.0L and it has an oil leak pretty bad. It seems to only leak oil for a short time after running the tank and the seems to be mostly grime and oil on the passenger side of the engine all the way down.

Also when I am driving the oil pressure gauge goes to like 70, and if I put more oil in, it will got back to 40. When it is just idling it will be 40, but again, driving it will be high.

Any ideas?

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Unread 05-13-2010, 08:51 PM   #2
orangeNblue302
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where does that grime and oil start on the Passenger side? Does the line go up to the Valve cover or does it seem to start lower?
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Unread 05-13-2010, 08:55 PM   #3
Calebxx12
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Eh, I would say it is there, but also a little lower. There is more dirt collecting lower, but there is oil by the valve cover. Valve cover gasket? I just don't get the oil pressure gauge.
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Unread 05-13-2010, 09:07 PM   #4
orangeNblue302
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More then likely its the valve cover gasket but keep an eye on the temp and keep checking the oil. If it seems to be coming from lower, like around the head it could be a head gasket but unlikely. Another major culprit is the oil sending unit o-ring. More then likely its the VCG.

Im not sure about the oil pressure issue. Im sure its related but a more experienced Jeeper will likely be able to tell you about that.

My VCG is leaking, not very bad but still leaking, and have no issues with the pressure.

Mine idles at 40 and goes to about 50 when driving.
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Unread 05-13-2010, 09:10 PM   #5
Calebxx12
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Yeah, if I could keep oil in the thing I think it would stay around that. Ill replace it this weekend and give an update on here if it doesn't work. Thanks!
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Unread 05-13-2010, 09:17 PM   #6
orangeNblue302
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Also check your rear main seal and oil pan gasket too. You are probably losing oil from more then one spot, if you're losing that much and not burning it.
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Unread 05-14-2010, 12:43 AM   #7
limited
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Completely degrease your engine. Then when you drive it afterwards you'll be able to zero in on where it is actually leaking from.
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Unread 05-14-2010, 06:23 AM   #8
Calebxx12
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Yeah I will degrease it first. It seems to have slowed down now, since it is only when I am driving, but I have noticed less since this warm weather has come back.

Thanks again guys, ill start with the valve cover gasket, and then got to the oil pan and rear main if I have to :|
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Unread 05-22-2010, 07:29 AM   #9
Calebxx12
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Well the valve cover gasket was no luck, think it is the rear main? Like I said, it only happens after driver, the oil pressure is high for awhile, it seems to drop down though.
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Unread 05-22-2010, 07:57 AM   #10
cruiser54
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Start at the top and work your way down. Oil , like *****, flows downhill. Ask any plumber. If you are 100% sure the valve cover gasket isn't leaking, look at your oil pressure sender and don't forget the notorious leaker, the oil filter adapter. BTW, did you run your fingers behind and below the rear of the valve cover when you were inspecting? Leave the rear main seal for absolute last. Concentrate on everything above oil pan level for now. I'd put my money on the oil sender and/or oil filter adapter. But more importantly, you need to put your eyes and hands on your Jeep and check it out yourself.
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Unread 05-22-2010, 08:01 AM   #11
Calebxx12
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Yeah I checked the rear of it, seems to be fine. oil sender? Never heard of that, but I will look into it. seems to be most oil below the valve cover gasket anyway.
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Unread 05-22-2010, 08:07 AM   #12
cruiser54
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Take a gander around the oil filter. That's where the oil sending unit is, you know that thing with the wire going to it so it can SEND a signal to the gauge on your dash. That's also the area where the oil filter adapter is, the deal your oil filter screws on to. These are very common areas to have leaks and are easily fixed. They must be addressed first before diving into a rear main seal replacement/
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Unread 05-22-2010, 08:15 AM   #13
Calebxx12
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yeah there is no fresh oil there. the fresh oil is dripping off the oil pan and the front of the tranny.
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Unread 05-22-2010, 08:34 AM   #14
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Do the 4.0s have an 0-ring around the distributor like the 2.8s do? I know thats where mine is leaking at this very moment and I just havent fixed it yet.

Or perhaps a distributor gasket of some sort? Sorry Ive never messed with a 4.0
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Unread 05-22-2010, 09:18 AM   #15
myriad360
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I might be ignoring whatever you found here, but make sure your the oil breathing line from the valve cover to the air box is not kinked. I kinked one of the lines going to the air box while messing with the air filter once, I think it was the big one, and it started puking oil.
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