Vibration in driveshaft - PeachParts Mercedes-Benz Forum

spit64 · #1 07-30-2007, 04:25 AM

I have vibration from the driveshaft it seems like. The flexdisks seems like they are in goodshape I have change the bearing in the middle of the shaft and transmission mount still the vibration is there at a speed at 100-140km (62-90mph). Could be the joint but is this common?

Matt L · #2 07-30-2007, 04:44 AM

Finding vibrations like this is hard (stating the obvious).

I don't know that vibration at the joint is common, but any rotating part with free play will cause vibration. Are you sure that the vibration is coming from the driveshaft? If it goes away at higher speed, I'd suspect a tire. Driveshaft vibration could also go away at a higher speed, of course, but tires typically do this.

spit64 · #3 07-30-2007, 06:49 AM

No I am not 100% sure but the tires I am sure is not the cause to this problem you are right about it's hard to find the problem maybe vibration is wrong word I can't feel any it's is more the sound.Perhaps in the foor a slight feeling.

david s poole · #4 07-30-2007, 12:10 PM

strangely enough any drive shaft vibration will start to occur about 60mph.when you did the carrier bearing did you line the marks back up where the two pcs of the shaft separate? and did you tighten up the big nut at the slip joint?

spit64 · #5 07-30-2007, 04:16 PM

Quote:

Originally Posted by david s poole

strangely enough any drive shaft vibration will start to occur about 60mph.when you did the carrier bearing did you line the marks back up where the two pcs of the shaft separate? and did you tighten up the big nut at the slip joint?

I hope so because a had a MB service garage do the job and the vibration was there before a had the job done, or if a explain the sound like a Booming (Thrumming) noice but not loud it is like the shaft is not balanced but the problem was not there when I bought the car.

S-Class Guru · #6 07-30-2007, 05:35 PM

I've had a similar "vibration" or booming for several years, and have never found the cure. Occurs at 65-80 MPH or so, only under load, like when going up a slight hill. Worse with weight in the back. Definitely driveline-related, cause the frequency is much higher than a wheel vibration.
Over the years I replaced flex discs, center bearing, switched the drive axles, etc. I did notice some "detent" or wear in the universal joint at the front of the rear shaft, maybe this is it. but replacing that u-joint is a $350 job, with some guys reporting more harm than good. So, I've been waiting for it to get worse - it hasn't.

Does yours have any of these symptoms? Like only happens under load?

DG

Bruno_300TE · #7 07-30-2007, 09:58 PM

Hi
I got a rebuilt driveshaft after trying everything else (tires, flex discs, center support bearing, front wheel bearings, steering damper). Vibrations were gone! Costs were around 400$. Changing the driveshaft is easy, especially if you have prior experience with the flex discs and center support bearing.
Burno

spit64 · #8 07-31-2007, 03:05 AM

No there is no difference in load or coasting it's speed related.
MB had a bulletin on this problem and the solution was to balance the shaft in the car or fix it with a damper on the rear axle housing and rear axle carrier.
Maybe this fix was when the car was new and under warranty i will remember my car have this damper I have a picture but I found no easy way to attach it on the message.

Pete Geither · #9 07-31-2007, 05:20 AM

We cured this problem on a 126 car by shimming the center carrier bearing about 1/8 inch. Must have changed the angle of the dangle enough to really make a difference. After 6 months customer declares vibration is long gone.