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Unread 10-07-2012, 06:58 AM   #1
stcarter44
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Rear main seal

I have to replace the rear main seal on a 93 yj 6 cyl.. Anyone have a good write up of this or anyone near Taunton ma wanna help me out?

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Unread 10-07-2012, 07:21 AM   #2
andygio71
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Pick up a Haynes or a factory service manual if possible, it's all spelled out in there step by step. A manual is worth every penny. But so you know what you're getting yourself into, it basically goes like this:

-drop the pan (may have to remove the starter, can't remember)
-unbolt the rear bearing cap
-remove the lower seal from the bearing cap
-CAREFULLY remove the upper seal from around the crank (this part can be a pain)
-carefully replace both seals after putting oil on them, and making sure they are offset like you found them
-put bearing back on, torque to spec
-replace pan and seal as necessary
-pray
-fill oil

It's messy and time consuming, but not very difficult because it is a two-piece seal.
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Unread 10-07-2012, 08:14 AM   #3
sdotcarter
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to the above.

And if you need help, I can swing down and give you a hand sometime.
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Unread 10-07-2012, 09:32 AM   #4
jokerchief462
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Check out a YouTube video two parts. Try YJ rear main seal it will help.
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Unread 10-07-2012, 10:32 AM   #5
stcarter44
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Quote:
Originally Posted by sdotcarter
to the above.

And if you need help, I can swing down and give you a hand sometime.
Thanks ill let you kno if I get hung up.
I do plan on replacing the oil pan gasket the same time.. Sounds to me like this is gonna be a Saturday morning into Sunday project for me. But it doesn't seem like its to to difficult to do.

I was gonna sen it to a shop and just have them do it but they want 400$ to do it! Yikes! The parts 15$ at auto zone so I think I'm gonna try and do it next weekend
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Unread 10-07-2012, 12:05 PM   #6
Opihi59
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Tons of links out there like this: http://jeepin.com/features/rearmain

Some tips--the punch to use to tap out the upper seal half, make your own out of a thin brass dowel rod section, brass will be way less likely to cause any damage. Buy the Felpro one piece gasket for the oil pan. When you pull out the bazillion bolts from the pan, you'll want to make sure they go back in the right places as there are several diff lengths and sizes. Get a piece of cardboard, lay your new gasket on this, poke a hole thru the cardboard where each gasket hole is, and as you pull out each pan bolt, poke the bolt thru that piece of cardboard so you'll put it back in the block in the same place. The two rearmost corner bolts also hold down a metal strip that goes across the back of the pan, they are also the 2 with the largest heads/thread size. You do not need to drop your tranny to do this job on the 4.0. It is a very very dirty job. Get a lot of rags. The gasket maker mentioned for the bearing end-cap face is RTV, I like to use the Black RTV. There will be a lotta crud in the bottom of your pan for you to clean out. I also got a 1/2 X 20 TPI tap and ran it thru my oil drain plug hole threads to make sure there were no gunked up threads while it was off. Hose it out, dry it off and set aside for reinstall.
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Quote:
Originally Posted by Brian4.2 View Post
We will be going Metric every inch of the way.
Quote:
Originally Posted by 40dog View Post
yes I'm a some guy and have always put gasket sealer on my surfaces before mating
Quote:
Originally Posted by Virjeep View Post
You should go to Pirate. I hear they are real smart over there. You'd fit right in.
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Unread 10-07-2012, 12:46 PM   #7
stcarter44
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hmm.. thanks alot for that write up! after seeing those pics im a little more worried about doing this now. Taking out the oil pan seems to be the easy part which im sure i can handle but i had a hard time looking at the bearing and seal. Im not the most mechanical person but i cant afford the 500$ to the shop. anyone have a little more detailed pics about that ?
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Unread 10-07-2012, 01:05 PM   #8
Opihi59
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That was just one link of many. I googled Jeep Rear main seal and just started clicking links. There are a few variations based on the year, YJ vs TJ but this isn't rocket surgery. Google it up, start saving the best links to your favorites, buy your parts and get it done. Before it gets real cold and icky up there.
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Quote:
Originally Posted by Brian4.2 View Post
We will be going Metric every inch of the way.
Quote:
Originally Posted by 40dog View Post
yes I'm a some guy and have always put gasket sealer on my surfaces before mating
Quote:
Originally Posted by Virjeep View Post
You should go to Pirate. I hear they are real smart over there. You'd fit right in.
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Unread 10-07-2012, 06:47 PM   #9
Apollo12227
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One of the easiest jobs I have done on my jeep. Don't be discouraged! You can do it! We are all here to help.
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Unread 10-07-2012, 09:22 PM   #10
ZGYJ
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I recommend parking your jeep, draining the oil, then letting it sit for at least a day. It's an oily and dirty job, especially if it's been leaking a while. But it's not really hard. I actually have to do mine again, there were no leaks for a couple of years but it's back to it again. Sad. First time took me six hours. Next I expect it'll take me no more than two or three.

The tricky part was punching out the previous main seal from inside the block. The reason it's hard is because the bottom of the transmission is in the way. You just need to get a long, strong, thin punch to allow you to get some distance below the transmission housing to tap it out, rather than becoming a contortionist. I took an old broken 3/8 inch extension and cut away some metal from the end with a grinder, made a little nub so now I can just go below the transmission and tap it out in just a second or two.

I was about to spend the $400 when the guys here talked me into trying it. I'm glad I did.
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Unread 10-08-2012, 12:45 PM   #11
stcarter44
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I think I will attempt it.. I will keep you guys posted
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Unread 10-11-2012, 11:19 AM   #12
Newk76
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How did it go? We are about to attempt this on ours tonight.
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Unread 10-11-2012, 11:27 AM   #13
Randonexplosion
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Quote:
Originally Posted by ZGYJ View Post
I recommend parking your jeep, draining the oil, then letting it sit for at least a day.
This. Nothing like motor oil dripping onto your eyeball...

(drop the oil pan then let it sit)
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Unread 10-11-2012, 11:34 AM   #14
stcarter44
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Still haven't done it yet.. Keep putting it off since it's not that bad
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Unread 10-11-2012, 11:41 AM   #15
ZGYJ
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Quote:
Originally Posted by Randonexplosion View Post
This. Nothing like motor oil dripping onto your eyeball...

(drop the oil pan then let it sit)
If this were on FB I would "like" it.
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