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#1
08-15-2007, 12:12 AM
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1994 E320 SW driveline vibration - need help
Hi,
I see from doing a number of seaches on vibration that there are many, many posts relating to vibration, and successful diagnosis and repair is very difficult.. My car has a vibration or thrumming, drumming noise starting at about 120 km/hr and up, not heavy, but very noticeable and annoying. It sounds that it is a higher frequency than from the wheels or axle shafts. I had the driveshaft balanced, new centre support bearing and mount, and driveshaft bushings done but no difference. The flex disks were apparently OK. I would think the possible causes could include: 1. driveshaft bent or unbalanced (already balanced) 2. flex disks damaged 3. U-joint wear 4. worn centre support bearing or rubber mount (replaced) 5. driveshaft angular misalignment (transmission/front shaft ;front shaft/rear shaft; rear shaft/differential) 6. loose or worn differential mounts Does anyone have any advice on how to narrow down the possible causes? Does anyone have a copy of the MB TSB on driveline vibrations that recommends addition of a damper on the differential? Do you have a copy you could send me? I was thinking of tape recording the sound inside the car and putting it on an oscilloscope to look at the relative frequencies. One can easily calculate the driveshaft RPM vs road speed, but there may be other multiples as well, eg: 2x per rev, 3x per rev, 6x rev, based on physical geometry of flex disks and fastenings. Advice on diagnosis and most likely causes and fixes would be greatly appreciated.. Very best regards, James Toronto, Canada  
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#2
08-15-2007, 12:11 PM
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Moved
Moved for better answer..
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