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Garage => Mechanicals => Topic started by: Rolo on 07 February 2022, 04:30 PM

Title: Vibration under load
Post by: Rolo on 07 February 2022, 04:30 PM
Just when everything is starting to get good, my 6.9 has developed a vibration under power.  Most noticeable at lower speeds like climbing a steep hill at 40 mph.  A gentle shake, but you can definitely feel.  About 2,000 RPM with 3/4 throttle brings it on.  Not noticeable off the throttle or at freeway speeds.  Gets a little worse with more revs.

Car has new flex discs and thanks to the this Forum, a well aligned propeller shaft.

Any ideas?  Thanks.
Title: Re: Vibration under load
Post by: Jan S on 07 February 2022, 05:29 PM
Did you replace the drive shaft center bearing and the rubber mount at the same time as the flex discs?

I had the same problem .... due to shot rubber mount for the center bearing.
Title: Re: Vibration under load
Post by: daantjie on 07 February 2022, 05:51 PM
Also check diff mount and transmission mount.  If suspect replace with Benz parts only.  They are both relatively easy replacements and can cause the vibration you are describing.
Title: Re: Vibration under load
Post by: Rolo on 07 February 2022, 07:26 PM
Bearing done, mounts, I can't remember.  Will check all.

This Forum is great!
Title: Re: Vibration under load
Post by: Rolo on 23 February 2022, 04:28 PM
More troubleshooting to report.

Vibration is much more evident while turning under power.  Up hill turns bring out the worst.

Any additional tips?  Thanks