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  #16  
Old 12-02-2009, 07:53 PM
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also could try cleaning/wire brushing the bearing hubs where the rotors mount ~~~ dirt/rust underneath won't allow the rotor to sit flush and cause a vibration

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  #17  
Old 12-02-2009, 08:01 PM
Texholdem
 
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Quote:
Originally Posted by teezer View Post
also could try cleaning/wire brushing the bearing hubs where the rotors mount ~~~ dirt/rust underneath won't allow the rotor to sit flush and cause a vibration
It has also been done prior to mounting the new rotors.
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  #18  
Old 12-02-2009, 08:02 PM
Texholdem
 
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Quote:
Originally Posted by 300EE320 View Post
You can also rotate yout tires and if there is a change in the feel of the vibration, then it would point to tires being out of balance.
Thanks, I am going to give it a try.
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1996 E320 since 1/16/08, 171K miles as of Feb 2011

---------------------------------------------------------
1989 300CE - R.I.P. Dec 29 2007
Other MBs (sold): 1992 300E-24 - 1979 350SLC - 1984 230E - 1990 300CE
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  #19  
Old 12-02-2009, 09:29 PM
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well, here's something...you mentioned that put new sway bar bushings in? Did you properly lubricate and pre-load these bushings? That could cause this...
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  #20  
Old 12-02-2009, 09:40 PM
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actually, the more I examine this thread, the more it seems that it's the sway bar bushings, as you been in there anyway...I'd look there first...I've seen this before in other German automobiles...these bushings are very tempermental to install....they do alot of work and don't like to be screwed with....if you do it incorrectly (the replacement) it will come back and raise some hell...if it were something like the brakes it would become more than apparent by now, same with wheel lugs and rim balancing and stuff like that there...no, this sounds like sway bar stuff to me...good luck
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  #21  
Old 12-03-2009, 12:02 AM
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I agree with above. Most of the components, wheel/tire, bearings, rotors are more inclined to have a lower frequency.
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  #22  
Old 12-03-2009, 09:44 AM
Texholdem
 
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Quote:
Originally Posted by cliffmac View Post
well, here's something...you mentioned that put new sway bar bushings in? Did you properly lubricate and pre-load these bushings? That could cause this...
We put dish washer soap on the bushings. What means pre-loading the bushings?

Quote:
Originally Posted by cliffmac View Post
actually, the more I examine this thread, the more it seems that it's the sway bar bushings, as you been in there anyway...I'd look there first...I've seen this before in other German automobiles...these bushings are very tempermental to install....they do alot of work and don't like to be screwed with....if you do it incorrectly (the replacement) it will come back and raise some hell...if it were something like the brakes it would become more than apparent by now, same with wheel lugs and rim balancing and stuff like that there...no, this sounds like sway bar stuff to me...good luck
Yes, it was a hard job to mount the bushings and the sway bar. We did the best we could, maybe not good enough. I gonna check it. Thanks for the info.
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1996 E320 since 1/16/08, 171K miles as of Feb 2011

---------------------------------------------------------
1989 300CE - R.I.P. Dec 29 2007
Other MBs (sold): 1992 300E-24 - 1979 350SLC - 1984 230E - 1990 300CE
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  #23  
Old 12-03-2009, 10:23 AM
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Is it possible your work has caused a transmission fluid hose to come in contact with the chassis or the bar you just worked on?
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  #24  
Old 12-03-2009, 12:10 PM
Texholdem
 
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Quote:
Originally Posted by Chas H View Post
Is it possible your work has caused a transmission fluid hose to come in contact with the chassis or the bar you just worked on?
I don't think so but gonna have a look. Thanks!
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1996 E320 since 1/16/08, 171K miles as of Feb 2011

---------------------------------------------------------
1989 300CE - R.I.P. Dec 29 2007
Other MBs (sold): 1992 300E-24 - 1979 350SLC - 1984 230E - 1990 300CE
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  #25  
Old 12-03-2009, 08:25 PM
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pre-loading

pre-loading is simply installing the part, you did OK with the soap initially, but that stuff dries out quickly, there is special stuff, but, anyway, preloading is installing the part while jacked up, of course, but not actually
torqing the fasteners to spec until after the car has been lowered off the jacks and all of the weight is on the suspension...that allows the bushings to seat in the proper fashion. If you lock the bushing/carriers into place without the proper stress you could experience what you mention. Your new bushings are fighting to situate themselves...Leads to premature wear as well....
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  #26  
Old 12-03-2009, 08:32 PM
Texholdem
 
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Quote:
Originally Posted by cliffmac View Post
pre-loading is simply installing the part, you did OK with the soap initially, but that stuff dries out quickly, there is special stuff, but, anyway, preloading is installing the part while jacked up, of course, but not actually
torqing the fasteners to spec until after the car has been lowered off the jacks and all of the weight is on the suspension...that allows the bushings to seat in the proper fashion. If you lock the bushing/carriers into place without the proper stress you could experience what you mention. Your new bushings are fighting to situate themselves...Leads to premature wear as well....
How do one get under the car and torque the fasteners "after the car has been lowered off the jacks and all of the weight is on the suspension"? Even when the car was on 4 jacks and all wheels were off, there was barely enough room to operate.
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1996 E320 since 1/16/08, 171K miles as of Feb 2011

---------------------------------------------------------
1989 300CE - R.I.P. Dec 29 2007
Other MBs (sold): 1992 300E-24 - 1979 350SLC - 1984 230E - 1990 300CE
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  #27  
Old 12-03-2009, 09:30 PM
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yes....see? this is why everyone is not a mechanic, the important thing is, if you can conceptualize the issue the solution should appear shortly...good luck....
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  #28  
Old 12-03-2009, 09:44 PM
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pre-loading

Ask any decent Mercedes or any mechanic about pre-loading.....here's how I do it....I simply put the wheels back on and lower the car down onto a bunch of 4X4's while keeping some jack assistance..the lowering of the car onto its' haunches is sufficient..it allows everything to sit nice like. Then I go in and ratchet everything up...then you lift back up...remove the 4X4s or whatever, with the tires still on, lower the car via the jacks to the point where you can make sure the lugs are still tightened properly..if so (as it should be) drop the car and you should be good to go...there must enough room under there to do these things...are you sure your jacking the car up high enough?
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  #29  
Old 12-03-2009, 10:27 PM
Texholdem
 
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some good news; I thought I'd go with the easiest fix first. I checked my manual on the torque specifications and it says 80 ft.lb , meaning the wheels were a bit overtightened by 15 ft.lb. I bought a heavy torque wrench and retorqued them to specs. Voila, the vibration is gone!

It's surprising that just 15 ft pounds made a difference but it did.

Thanks for all inputs, I keep them all in mind for future reference.
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1996 E320 since 1/16/08, 171K miles as of Feb 2011

---------------------------------------------------------
1989 300CE - R.I.P. Dec 29 2007
Other MBs (sold): 1992 300E-24 - 1979 350SLC - 1984 230E - 1990 300CE
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  #30  
Old 12-03-2009, 10:43 PM
Texholdem
 
Join Date: Mar 2007
Location: Dallas
Posts: 756
Quote:
Originally Posted by cliffmac View Post
Ask any decent Mercedes or any mechanic about pre-loading.....here's how I do it....I simply put the wheels back on and lower the car down onto a bunch of 4X4's while keeping some jack assistance..the lowering of the car onto its' haunches is sufficient..it allows everything to sit nice like. Then I go in and ratchet everything up...then you lift back up...remove the 4X4s or whatever, with the tires still on, lower the car via the jacks to the point where you can make sure the lugs are still tightened properly..if so (as it should be) drop the car and you should be good to go...there must enough room under there to do these things...are you sure your jacking the car up high enough?
that is smart, my simple mind did not figure it out , just got stuck with the image of the car lowered meaning 4 wheels on the ground

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1996 E320 since 1/16/08, 171K miles as of Feb 2011

---------------------------------------------------------
1989 300CE - R.I.P. Dec 29 2007
Other MBs (sold): 1992 300E-24 - 1979 350SLC - 1984 230E - 1990 300CE
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