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#1
11-08-2009, 12:52 AM
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Rear main seal question - 3.0L 5-speed manual
Has anyone replaced this seal themselves? If so, how many hours should it take and is there enough room to drop/remove the tranmission if the vehicle is up on ramps and/or jackstands? Anything I need to watch out for? Has anyone seen a write up anywhere (came up dry after searching for a couple of hours)?
I have experience doing this type of work on FWD vehicles but just trying to gauge what I might be in for with the X5. TIA. Christian 
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#2
11-08-2009, 01:02 AM
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I have no experience doing this repair on an X5 (I have done it on other vehicles). Just a comment that it isn't a common failure. Haven't heard of another one failing. There are a few very common potential oil leaks up above, and it can run down and appear to be coming from the rear seal. Recommend you take a good look and make sure that it is in fact the rear seal, and not a breather line or the back of the valve cover gasket.
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2007 X3 3.0si, 6 MT, Premium, White Retired: 2008 535i, 6 MT, M Sport, Premium, Space Grey 2003 X5 3.0 Steptronic, Premium, Titanium Silver 2002 325xi 5 MT, Steel Grey 2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue
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#4
11-08-2009, 01:16 PM
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I've dropped and replaced a trans in 740/750's within 5hrs in my home garage. It's not that hard, but it's by no means fun either.
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 650hp 10 X5///M - Stage 2, Vibrant 1794's , gutted cats, custom intake, AC Forged 22's 325hp 98 BMW 740iL - ///M5 6spd, www.bavengine.com w/ Performance Option, electric fan, CF intake tube w/ heatshield, Mag 14816 w/ notched bumper, Bilstein/H&R Stage II/Powerflex 600+hp 02 Harley F150 - MHP900 Stage 3 engine, KB2.3, 8# lower, 60# inj, Walbro FP's 135hp 01 TL1000R - M4 full exhaust, K&N, Yosh box, -1/+2 gears, 2CT's
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#5
11-08-2009, 08:31 PM
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Awesome, I really appreciate the feedback everyone!
Vehicle has 127K miles/204K km on it and we had the oil separator issue a while back so I'm wondering if an over pressurization may have helped caused a premature failure. Definitely no leaks from above.
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