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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 08-31-2014, 07:49 AM   #1
Sh0ty
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Join Date: Jun 2012
Location: Michigan
Posts: 24
My Ride: 2004 330Ci
Unhappy Help Request: Speed Specific Driveline NVH - High Amplitude Vibrations - Diagnosis

Hello,

I have been chasing a vibration issue in what I suspect to be my driveline that occurs between approximately 35-45 mph. The vibration is independent of gear selection and engine speed, hence my suspicion that the culprit lies behind the transmission output shaft. Pertinent information:
  1. The Guibo was changed approximately 3 weeks prior to this posting - This was not to chase NVH, but to eliminate elasticity in the driveline
  2. I just replaced the center support bearing (CSB) yesterday
  3. There appears to be a very slow (no dripping, just discoloration) leak from the driver's side CV joint from the differential. This could be a function of the vibration rather than the root cause - but I'm not certain.

When replacing the guibo, I placed the original CSB in the location I had marked when I loosened it. This placed the assembly under significant pre-load, so I suspected it could be the cause of my issue. Reading over this, it seems as if the obvious change was the guibo, and that perhaps I have received a lemon. The Guibo was a non-genuine BMW part.

Has anyone encountered anything similar, and have any suggestions for what may be ailing me?

Thank you
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Old 08-31-2014, 08:44 AM   #2
markusmarkus
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Join Date: Jul 2008
Location: USA
Posts: 1,316
My Ride: 2001 330Ci
First thing: check the level of the GL5 gear lube in the differential.

Vibration is the hardest thing to track down. Pull the rear seat's bottom cushion and have someone sit back there to see if the vibration is coming from the rear of the car.


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csb, driveline, driveshaft, guibo, vibration

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