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Old 08-19-2011, 12:29 AM   #1
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Main Rear Seal? And is this stock?

Hey, guys. Recently bought a '91 4.0, and the PO told me that he got a crate engine and a new transmission. First, I don't think he fully knew what he was doing because he didn't change the gasket on the valve covers...

Anyway:

I got up underneath my Jeep today, and saw there was a bit of oil. I got a rag and cleaned it up and it didn't come back. So, I guess it's only when it runs... but it's from here:



It also seemed like there was oil coming out of some of the bolts... The top is the oil pan, bottom is the bell housing / transmission.

Here's another shot:



The left is the oil pan, the right is the transmission. I've never seen a bell housing that isn't really a bell housing... but then again: I've never seen Jeep 4.0's up close like that.

Is it the main rear seal? And what do you guys suggest?

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Old 08-19-2011, 12:32 AM   #2
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4.0s always have a rear main seal leak, both my 05 and 93 have them and there nothing to worry about unless you have to start putting oil in between oil changes, which i have never had to do.

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Old 08-19-2011, 12:51 AM   #3
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4.0s always have a rear main seal leak, both my 05 and 93 have them and there nothing to worry about unless you have to start putting oil in between oil changes, which i have never had to do.
So, no point in fixing it?

The only reason I say it is because I live in a place that has a Homeowners Association, and they fine for oil marks in MY drive way... I guess I'll just have to get a nice big thing of degreaser.
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Old 08-19-2011, 12:57 AM   #4
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its not worth it unless you can do it yourself, a shops gonna charge you 700 just to pull the tranny, and its not harming the engine at all. it might just start leaking again soon after.

i rarely see oil spots where i park it.
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Old 08-19-2011, 12:59 AM   #5
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its not worth it unless you can do it yourself, a shops gonna charge you 700 just to pull the tranny, and its not harming the engine at all. it might just start leaking again soon after.

i rarely see oil spots where i park it.
Okay. I'll keep an eye out and see how bad it gets.


PS: You might know since you're pretty knowledgeable, do all automatic YJ's come with a shifter in the steering column?

My shifter is in between the seats...
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Old 08-19-2011, 02:43 AM   #6
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yea, there all on the column from the factory, someone probably converted it from a manual tranny.
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Old 08-19-2011, 04:41 AM   #7
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There's a column for sale with a shifter on it for $40 on eBay. Would it be an easy change?
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Old 08-19-2011, 04:49 AM   #8
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no, i'd imagine it would be hell trying to get the linkage parts. i know theres a part on the frame thats impossible to find,and you probably don't have it. the PO might have put a non-stock auto in there also, so it might not match up at all even if you find all the parts.

best advice if you want it on the colum that bad is to trade jeeps with someone who has a stock auto set up, but since you just got the jeep i don't think you want to do that.

why do you want to change it?
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Old 08-19-2011, 05:45 AM   #9
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Right now its my girlfriends DD, and it doesn't have a clear gear indicator, and she wanted one... honestly, that's about it.
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Old 08-19-2011, 06:18 AM   #10
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mine literally leaks in the same place i tried changing the rear main three times and i tried resealing the oil pan numberous times..it is def. frustrating but it is such a small drip just keep an eye on it
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Old 08-19-2011, 06:35 AM   #11
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Yeah. It drips 2 times every time I turn it off... Two drips shouldn't add up much by the time it's time to change the oil. Just a hassle cleaning it off the floor.

|The price of a jeep I guess :shrug:
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Old 08-19-2011, 07:08 AM   #12
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If 4.0l are not leaking oil there's something wrong. Both my YJ and XJ leak oil there and valve cover. My friends XJ, YJ, and MJ do it too.
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Old 08-19-2011, 11:57 AM   #13
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Go to Wally World, they have aluminum drip pans for cheap...
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Old 08-19-2011, 12:17 PM   #14
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My YJ and the XJ my wife drive both had rear main seal leaks. Replaced the seals, no more leaks at all. No need to pull the trans to replace the seal. Just pull the oil pan and you have access to the rear bearing cap. Take that off and replace the seal. The job is easier if your Jeep is lifted giving more space to drop the pan.

Here is a write up I found when I did my seal. Just ignore the part about the exhaust replacement. Jeep TJ Wrangler Rubicon 4.0L Oil Pan, Rear Main Bearing Seal Install | SavageSunJeep | SavageSun Engineering

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Old 08-19-2011, 12:29 PM   #15
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My YJ and the XJ my wife drive both had rear main seal leaks. Replaced the seals, no more leaks at all. No need to pull the trans to replace the seal. Just pull the oil pan and you have access to the rear bearing cap. Take that off and replace the seal. The job is easier if your Jeep is lifted giving more space to drop the pan.

Here is a write up I found when I did my seal. Just ignore the part about the exhaust replacement. Jeep TJ Wrangler Rubicon 4.0L Oil Pan, Rear Main Bearing Seal Install | SavageSunJeep | SavageSun Engineering

Jeff
Cool, thanks! I'll have to bookmark this, depending on what I decide to do later.
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Old 08-20-2011, 09:25 PM   #16
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If a rear main, or front crank seal, keep leaking after multiple replacements, it means that the main bearings are worn. It will cause the crank to sit low in the main bore and not centered on the bearings or seals.
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Old 08-21-2011, 12:12 PM   #17
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Originally Posted by turdhurdler View Post
My YJ and the XJ my wife drive both had rear main seal leaks. Replaced the seals, no more leaks at all. No need to pull the trans to replace the seal. Just pull the oil pan and you have access to the rear bearing cap. Take that off and replace the seal. The job is easier if your Jeep is lifted giving more space to drop the pan.

Here is a write up I found when I did my seal. Just ignore the part about the exhaust replacement. Jeep TJ Wrangler Rubicon 4.0L Oil Pan, Rear Main Bearing Seal Install | SavageSunJeep | SavageSun Engineering

Jeff
I had the same problem with my first YJ,and XJ. Easy fix, glad it had a two piece rear main. Never had a leak after that!!
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Old 08-21-2011, 07:26 PM   #18
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I had the same problem with my first YJ,and XJ. Easy fix, glad it had a two piece rear main. Never had a leak after that!!
So, the the YJ has that two piece rear main as well?

I'll get on that then! Looks pretty easy.
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Old 08-22-2011, 06:19 AM   #19
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If a rear main, or front crank seal, keep leaking after multiple replacements, it means that the main bearings are worn. It will cause the crank to sit low in the main bore and not centered on the bearings or seals.
wow i never thought of that.. i replaced my seal two times and it still leaks..i didnt think to check the condition of the bearings lol good point

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