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Old 12-26-2008, 04:33 PM   #1
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How much for a rear main seal job?

I'm pretty sure I need my rear main seal fixed. Anyone know about how much it costs? Maybe how long it takes to do? I have get the seal for about $20.

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Old 12-26-2008, 06:47 PM   #2
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Should be under $500. Its not one of the more fun things to get to. I had one go on a CJ-7. I found it cheaper to check the oil level more often than get it fixed, geez that sounds bad.

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Old 12-26-2008, 10:26 PM   #3
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ya, to pay a shop its all labor. but its not behind the trans, its a two peice seal. remove the oil pan, the rear main bearing cap, and the seal comes out in two peices. gotta slide the top half out, and back in. its easy to forget how the seal was facing, and to screw it up sliding the top half up. otherwise its not too bad of a diy job.

you will have oil on your head by the time you're done.
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Old 12-27-2008, 12:54 PM   #4
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If it is your first, and you have the place to do it. Take your time and consider other items you might as well replace while you are at it such as clutch,throw out bearing,and have your flywheel turned. some guys go as far as pulling the motor and re-sealing it up and timing gears too.
thats another reason the engines are called the 4 leaker.
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Old 12-27-2008, 05:12 PM   #5
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the trans won't be out, no need to do clutch stuff. it is really about a 2 hr job in a shop. 4hr on your back
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Old 12-27-2008, 07:39 PM   #6
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Here is a link to a nice write up if you decide to do it yourself.

[Repair] Rear Main Seal Replacement
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Old 12-27-2008, 11:08 PM   #7
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Originally Posted by rkwfxd View Post
Here is a link to a nice write up if you decide to do it yourself.

[Repair] Rear Main Seal Replacement

This is a decent write up although it is for a tj - only minor differences which are evident when you do it.

You should be able to find someone to do it for less than $300 labor. If you have done some of your own mods, then you can probably do it yourself if you have a 1/2" torque wrench and a set of punches (in addition to a common set of wrenches). I had to loosen a couple of main caps when I did mine in order to get the upper seal out.

Further, I took the time to check the wear on a couple of main and rod caps to see how the bearings were doing as well as checked the piston skirts, etc. One other thing I did while I was under there was replace the oil pump. I figured since I was there and the engine had 101K miles on it . . .

Doing it yourself lets you see how well your engine is doing (what crap is on the bottom of the pan, bearings, etc).

ETA: When you get it all slapped together, run your engine or go around the block and it will help your new pan gasket get a seal (heats everything up).
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Old 12-29-2008, 08:40 AM   #8
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Im all for a "DIY" job, but when it comes to some "sorta" major repair (rear main, clutch, trans work), I'd feel better with a parts/labor warranty. I had the rear main on my 94 YJ replaced by a local shop when I bought it (it was leaking when purchased), it leaked again about 1500 miles after the repair, I dropped it off again and let them deal with it!! lol 12/12 Warr.
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Old 12-29-2008, 08:41 AM   #9
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Sorry, It cost me approx $375.00 P&L

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