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Thread: Rear main seal leak

  1. #1
    Super Moderator Getting Dirty 07JeepXK's Avatar
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    Rear main seal leak

    Matt I need your help. Last weekend when changing my oil I found a leak which appears to be coming from the rear main seal. Can you send me anything you can find in the service manual that I can take a look at prior to tackling the job. I know it's a big job and I'm confident I can do it.
    2007 4.7 Liter XK | Front Modified OME HD Lift | Rear 4" Superlift | JBA UCA's | Rusty's Rear Adjustable Track Bar | Rysty’s Adjustable Upper and Lower Rear Control Arms w/Heim Joints | Mickey Thompson Classic III 17x9 Wheels | 315/70R17 Goodyear Duratracs | Airflow Snorkel | Flowmaster 40 Series Muffler | Superchips Flashpaq | Mopar Skids | 4xGuard Belly Guard | American Rebel Rear Diff Cover | Rear Powertrax No-Slip | Front Electronic Locker | Rear Heat/AC Delete

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    Lifetime Member Getting Dirty Matt's Avatar
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    You already replaced the front oil seal right? It's similar to that.... except you have to remove the trans.

    Procedure is the same as in the 05WK service manual we have a copy of. If you need to, download it here:
    https://dl.dropbox.com/u/24438380/2005-WK-SM.pdf

    Oil seal replacement is page 9-1376.

    Hardest part, IMO, is R&R of the trans if you don't have a jack.

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    Super Moderator Getting Dirty 07JeepXK's Avatar
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    Yeah I replaced the front seal over the winter. Now the rear appears to be bad and the leak got worse since last weekend. I'm aware that the transmission and fly wheel need to come out. I just like reading up on on it prior to getting my hands greasy because every vehicle is a little different. I've pulled many transmissions in the past so I'm not too worried. I have access to a lift and my brother works R&R at a transmission shop if it comes down to me needing him. I just need to locate a trans jack. Maybe I can "barrow" one from his shop.
    2007 4.7 Liter XK | Front Modified OME HD Lift | Rear 4" Superlift | JBA UCA's | Rusty's Rear Adjustable Track Bar | Rysty’s Adjustable Upper and Lower Rear Control Arms w/Heim Joints | Mickey Thompson Classic III 17x9 Wheels | 315/70R17 Goodyear Duratracs | Airflow Snorkel | Flowmaster 40 Series Muffler | Superchips Flashpaq | Mopar Skids | 4xGuard Belly Guard | American Rebel Rear Diff Cover | Rear Powertrax No-Slip | Front Electronic Locker | Rear Heat/AC Delete

  4. #4
    Lifetime Member Getting Dirty Matt's Avatar
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    Dude you're set then.

    Honestly i used to hate the front seals more just because of all the little crap that usually has to come out. With a good trans jack, as long as the top trans bolts arent hard to get to, getting to the rear main aint bad.

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    Super Moderator Getting Dirty 07JeepXK's Avatar
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    I hear you. My biggest concern is getting the old seal out and the new one in without the proper tool. I guess I'll worry about that when the time comes. If not thats when I call jay to stop by and get the old one out and new one in..haha
    2007 4.7 Liter XK | Front Modified OME HD Lift | Rear 4" Superlift | JBA UCA's | Rusty's Rear Adjustable Track Bar | Rysty’s Adjustable Upper and Lower Rear Control Arms w/Heim Joints | Mickey Thompson Classic III 17x9 Wheels | 315/70R17 Goodyear Duratracs | Airflow Snorkel | Flowmaster 40 Series Muffler | Superchips Flashpaq | Mopar Skids | 4xGuard Belly Guard | American Rebel Rear Diff Cover | Rear Powertrax No-Slip | Front Electronic Locker | Rear Heat/AC Delete

  6. #6
    Lifetime Member Getting Dirty Matt's Avatar
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    You'll probably be alright.... those tools basically "idiot proof" the job. There's always Macguyver methods...

  7. #7
    Super Moderator Getting Dirty 07JeepXK's Avatar
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    Exactly. So much work all for a $14 seal.
    2007 4.7 Liter XK | Front Modified OME HD Lift | Rear 4" Superlift | JBA UCA's | Rusty's Rear Adjustable Track Bar | Rysty’s Adjustable Upper and Lower Rear Control Arms w/Heim Joints | Mickey Thompson Classic III 17x9 Wheels | 315/70R17 Goodyear Duratracs | Airflow Snorkel | Flowmaster 40 Series Muffler | Superchips Flashpaq | Mopar Skids | 4xGuard Belly Guard | American Rebel Rear Diff Cover | Rear Powertrax No-Slip | Front Electronic Locker | Rear Heat/AC Delete

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    Senior Member Getting Dirty criket's Avatar
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    Just to be sure I'm on the same page, the rear main seal on the engine is leaking? Do you have an idea as to what may have caused it? Or are these vehicles prone to this happening?

    I'm just curious.
    SOLD - 2005 | WK | Khaki | 3.7 | QT1 | OME HD Front Struts | Rusty's 2" lift in Rear w/ Monroe load levelers (F150 version) | 265/70 Nitto Terra Grapplers | 17" Moabs | 1.5" wheel spacers | Pinch weld mod | Rear fender trim mod | 4xG Matrix w/ reciever hitch | 4xG Belly guard | SOLID Diff cover | Cobra CB radio | 4xG CB radio antenna mount

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    Super Moderator Getting Dirty 07JeepXK's Avatar
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    Yes. It's the rear main crank seal located behind the fly wheel. Im not sure on the exact cause of the leak. I have 110,000 miles on my engine. I was told the 4.7's are known for this.
    Last edited by 07JeepXK; 07-20-2012 at 08:04 PM.
    2007 4.7 Liter XK | Front Modified OME HD Lift | Rear 4" Superlift | JBA UCA's | Rusty's Rear Adjustable Track Bar | Rysty’s Adjustable Upper and Lower Rear Control Arms w/Heim Joints | Mickey Thompson Classic III 17x9 Wheels | 315/70R17 Goodyear Duratracs | Airflow Snorkel | Flowmaster 40 Series Muffler | Superchips Flashpaq | Mopar Skids | 4xGuard Belly Guard | American Rebel Rear Diff Cover | Rear Powertrax No-Slip | Front Electronic Locker | Rear Heat/AC Delete

  10. #10
    Senior Member Getting Dirty criket's Avatar
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    oh ok, well that stinks. Most engines, the rear main seal doesn't go unless it's high miles or it has some internal failure.

    Take pics when you do it. It'll be good info to have just in case. Best of luck.
    SOLD - 2005 | WK | Khaki | 3.7 | QT1 | OME HD Front Struts | Rusty's 2" lift in Rear w/ Monroe load levelers (F150 version) | 265/70 Nitto Terra Grapplers | 17" Moabs | 1.5" wheel spacers | Pinch weld mod | Rear fender trim mod | 4xG Matrix w/ reciever hitch | 4xG Belly guard | SOLID Diff cover | Cobra CB radio | 4xG CB radio antenna mount

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