X5 E 70 rear differential leak

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Check out what I found on a X5 E70 with CPO,,,,while replacing and updating the ignition coils I found the rear input shaft seal leaking on the rear differential.

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These are some of the tools needed for this job,,,,you can not do this job without these tools,,,,there no way BMW made sure of that,,,,the tool on the right that looks like it fits over a big nut,,,,that one is used to unscrew the driveshaft from the rear differential,,,,,the other one with 12 points is used to unscrew the rear differential final drive nut for the pinion,,,,,BMW has both these bolted down real tight and they used a lot of lock tight on the threads,,,,they use so mush that you have to warm it up to loosen the lock tight.

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Here you can see the driveshaft being unbolted from the rear differential,,,,,you can see some threads coming out also you can see all the lock tight on the threads.

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This is the big nut you just saw,,,,,that you turn to release the driveshaft from the rear differential,,,,,you have to replace this big nut when performing this job,,,,,,I have seen some people chose not to,,,,,and get in trouble later on,,,,what happens is all the lock tight and all the torque of the driveshaft,,,,puts a lot of stress on this nut,,,,when you replace it and tighten it down,,,,BMW say to wait 2 hours before driving to cure the lock tight.

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7 Responses to X5 E 70 rear differential leak

  1. oasis says:

    Life just keeps getting better.

    -Oasis

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  2. Jon Macho says:

    How common is this issue. My dealer tells me being they stock the parts, it is common enough. I just purchased a 2013 E70 X5 3.5I. I have replaced the pinion seal on other vehicles, I have not attempted this. Please let me know.

    Liked by 1 person

    • It’s not a real common issue,,,this is not a backyard job,,,you need those special tools to perform this job.

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      • macho7337 says:

        I have the tools available and have done plenty of pinion seals on Chevy trucks. I plan to do most of the maintenance on this vehicle. Does orientation matter when the driveshaft is disconnected?

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      • No that doesn’t matter

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      • macho7337 says:

        So sir, other than the special tools is there anything that makes this job difficult? I see a lot of heat shields and covers, although it seems pretty straight forward. Disconnect the drive shaft, which will then expose the seal on the differential. Bearing should be able to remain intact. Replace the seal, nut and apply thread lock. In a very basic terms and steps

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      • Replace seal and get new nut which already has thread lock applied,,,,once driveshaft is tightened you must wait 1 hour before driving car to let thread lock cure,,,,driveshaft nut turns opposite direction to loosen,,,,again you will need special tools,,,sorry this is no Chevy or Ford drive shaft removal those are easy,,,,I hope you listen to me on this job,,,,if not good luck

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