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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Mechanical Maintenance: Break-in / Oil & Fluids / Servicing / Warranty > Crankshaft Rear Seal R/R **DIY ??????? **Help



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      06-13-2013, 12:16 AM   #1
mrjoe
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Exclamation Crankshaft Rear Seal R/R **DIY ??????? **Help

I have a leak from the crankshaft rear seal. Its a slow leak but i want to get it on the lift asap. Does anyone know where i can find a DIY or even the location in the TIS? I have a at home copy and im still looking through it) Also if i had the BMW technical terms it would make it easier to search. I also want to do my oil pan gasket (DIY's already avail), and the guibo.

Any suggestions of anything else that i can do while im this deep?

Much appreciated!!!
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      06-13-2013, 12:43 AM   #2
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Considering a leaky rear main seal or an oil pan gasket will collect oil at the same location, I suggest you address the oil pan gasket first since it's the easier of the two. You need to drop the transmission to access the rear main seal.

Sorry I couldn't help with any procedures.
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      06-13-2013, 01:27 AM   #3
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Im thinking trans should come off just to get everything done at the same time. Anyone know if there is a SA from BMW? Also anything to be said about oil additives to swell up the seal?
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      06-14-2013, 06:31 AM   #4
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So you don't mention what type of transmission the car has. If it is a manual and depending on the mileage I'd replace the clutch and related components (slave cylinder, etc.).

I've not yet pulled the tranny on my car, but I've done a few other BMWs in the past. There's really no magic to it. I've done all the below except pulling the trans.

Basically its:

remove the exhaust
remove the under panels
remove the drive shaft
Remove the transmission
Replace the seal

The oil pan seems a PIA if you don't drop the front subframe. If you are using a lift, I'd vote for dropping the subframe to get the proper clearance to work.

If you are digging this far into the car, I'd suggest buying the Bentley service manual; it's a good reference for what you are doing and keeping the car in the future. The TIS is a nice resource, but it is written for factory trained techs so there's not a lot of detail.

Attached is the Guibo/driveshaft replacement TIS procedure.
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File Type: doc E90 Guibo Replacement.doc (594.0 KB, 96 views)
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