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      01-11-2020, 08:09 AM   #1
jvictormp
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Diff leaking - What to do?

Hi!
I'd like you guys to watch the video at the link below. It shows that my differential is oil-wet outside, and now I have to figure out what to do.

The car is 44,000 miles, MY 2008, M3 E92.

It's been doing some vibration under deceleration for a while, but it is intermitent.

Last rain, I tried to "burn out" after a road bumper, 1st gear, wet ground, and it shook too much, I was kinda scared, but no problems after.

So, I suspected there's a problem at the shaft, and now this leak appears.

Let me know your opinions and directions, please.

Thanks in advance.

https://photos.google.com/share/AF1Q...dwU0dhR2hZUVZ3
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      01-11-2020, 08:54 AM   #2
pbonsalb
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I think there is a TIS on how to remove the diff input that includes info on replacing the seal. Itís been a while since I read it, though.
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      01-11-2020, 10:27 AM   #3
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Quote:
Originally Posted by pbonsalb View Post
I think there is a TIS on how to remove the diff input that includes info on replacing the seal. Itís been a while since I read it, though.
For you, it seems obvious that the leak is on the seal, right?
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      01-11-2020, 11:34 AM   #4
pbonsalb
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The other leak places are the outputs and those both looked dry. Plus the oil film started at the front, below the input.
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      01-11-2020, 01:00 PM   #5
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Pinion seal leak is common. Replace the seals.
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      01-13-2020, 09:06 AM   #6
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About the shaking thing I said, you think there's a probability that my giubo flex or something will show fatigue when I disassemble it to replace the seal, and I'll have to look for it with urgency?

Is there something I can do to anticipate the surprise, without wasting money with parts that don't need to be replaced?
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      01-13-2020, 09:26 AM   #7
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Quote:
Originally Posted by jvictormp View Post
Is there something I can do to anticipate the surprise, without wasting money with parts that don't need to be replaced?
Your car is 12 years old now, no money spent on parts would be wasted. Regardless of mileage, any soft parts would benefit from being replaced. Guibo, center support bearing, seals, etc. I would use the opportunity to refresh the driveline.
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      01-13-2020, 09:45 AM   #8
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I am using the original flex disk on my 08 6MT car at 101k. I had it off a few years ago at around 80k when I installed a 1 piece driveshaft and it looked too good to replace. I doubt itís shot at 44k. The driveshaft is probably fine too at that mileage. Iíd be focusing on engine mounts. Trans mounts will be fine.
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      01-14-2020, 08:41 PM   #9
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Diy:

https://www.m3post.com/forums/showthread.php?t=1469414
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