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Unread 04-03-2014, 02:39 PM   #1
mgkbull
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Help with smoking/leaking fluids

OK so this is a problem that has plagued me for a while now. I've got some oil dripping onto my exhaust, which creates some really bad fumes once the pipe gets hot enough. The problem is I can't tell where exactly the oil is coming from. I DO know it's not coming from up top (head gasket and such)

I've included some photos:
img_20140403_124046.jpg

img_20140403_124007.jpg

img_20140403_124000.jpg

Any help would be appreciated. Could this be my tranny leaking?

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Unread 04-03-2014, 03:21 PM   #2
Old4X
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RMS


Rear main seal
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Unread 04-03-2014, 05:01 PM   #3
mgkbull
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Thank you! That's it? That is the only thing that can cause this leak?
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Unread 04-03-2014, 05:03 PM   #4
Varnish
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Most likely, yes. Only option I know of is to clean the hell out of everything so you can actually get a fresh start and follow the leak but if it isn't coming from back of valve cover, most likely rear main. While not fun, luckily not as bad on a jeep as other vehicles.
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Unread 04-03-2014, 05:55 PM   #5
Old4X
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Quote:
Originally Posted by mgkbull View Post
Thank you! That's it? That is the only thing that can cause this leak?
It is coming down th back side of the inspection p;ate, so it is not your oil pan gasket.

The engine runs a pressurized oil system. The transmission is a splash and hope system, no pump or pressure.

While there is an input shavt oil seal on the transmission, the RMS is the first suspect as they tend to leak.

As mentioned, you can degrease everrything till it is clean and bone dry. Drive it till the engine is at normal temp, then sprinkle baby powder on suspect areas. Leaking oil will show up by the powder sticking.


Jeeps are one of the few vehicles where you can drop the oil pan without moving any structural members on the frame.
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Unread 04-03-2014, 06:13 PM   #6
mgkbull
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Great! Where exactly then is the RMS on the 4.2L?
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Unread 04-03-2014, 06:22 PM   #7
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Though it well could be the rear seal, also check the back of the valve cover gasket. They can (I had this happen) leak down the back of the block and produce a similar pattern.

If it is a valve cover gasket, DO NOT get the cheap cork one. Spend the extra bucks and get the molded rubber one. WELL worth it.
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Unread 04-03-2014, 06:31 PM   #8
Old4X
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Originally Posted by mgkbull View Post
Great! Where exactly then is the RMS on the 4.2L?
Drop the oil pan. Remove the rear main bearing cap. 1/2 the seal sits in the bearing cap, easy to replace. The other half is in the block, not as easy to replace, but can be worked out with some time. There are some excellent writeups on this, I think one is in the FAQs.
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Unread 04-03-2014, 06:47 PM   #9
whiskeywiz
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I have that same leak. Really strong stink. Falls directly onto the exhaust pipe. At one time I thought oil was leaking into the exhaust and burning off in that trap below the oil pan.

I think it's my valve cover. Dam cork gaskets.
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Unread 04-03-2014, 06:50 PM   #10
jay-h
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Quote:
Originally Posted by Old4X View Post
Drop the oil pan. Remove the rear main bearing cap. 1/2 the seal sits in the bearing cap, easy to replace. The other half is in the block, not as easy to replace, but can be worked out with some time. There are some excellent writeups on this, I think one is in the FAQs.
Be aware that sometimes the seal dries out and breaks up, so it can't be easily pulled.In those cases it may be necessary to drop the crank.
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Unread 04-03-2014, 06:54 PM   #11
Old4X
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Quote:
Originally Posted by jay-h View Post
Be aware that sometimes the seal dries out and breaks up, so it can't be easily pulled.In those cases it may be necessary to drop the crank.
It has only been in there 27 years, how stuck can it be?
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Unread 04-03-2014, 08:16 PM   #12
mgkbull
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I may take this to my mechanic to get it fixed then. He has the know how and the tools. Last thing I need to do is mess something up and make it more costly.
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Unread 04-13-2014, 01:08 PM   #13
mgkbull
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UPDATE: I just realized oil is coming into the cabin from above the transmission! WTH is that? Could that be related to my aforementioned leak?
Here's a pic from the passenger side of the transmission channel from inside the cabin.
img_20140413_125635.jpg

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Unread 04-13-2014, 04:16 PM   #14
mgkbull
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Bump
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Unread 04-14-2014, 12:39 PM   #15
Varnish
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I would think your leak was so bad and/or going on so long that its being blown onto the body and then weeping through that tranny tunnel cover.
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