[W126 Coupe] ... fix one problem - find another

[Jonathan]

No worries Alex, it's been a Hectic week (@ work again for another 
Sunday..).. 

If your part had a Mercedes Star on it you have a good part..if not, 
well..not so much.

I do not believe those bearing are adjustable..I'd wager instead they 
are likely worn as this is a normal item to replace when one re-does the 
diff..  Something you would want to consider anyway as I can all but 
guarantee your LSD clutches are done.

The other problem with this is MB doesn't release measurements for the 
bulk of their diff alignments but instead has jigs they want you to use :-/

Jonathan

Alexander Hochhausl wrote:

>

> Gents,

>

>  

>

> Does anyone know if the rear pinion input shaft bearings are 

> adjustable? My manual (CD) does not cover the rear at all! I'm hoping 

> it's possible to do this from the input side -- I really don't want to 

> take the whole thing apart. I have a new input sealin case I need to 

> replace that.

>

>  

>

> Reason for asking: My drive shaft bearing mount was shot (ripped 

> apart) -- BTW manuf. Name is Meyle ... OEM? Anyway, was only 3 years 

> old & came pre-mounted on a reman. Drive shaft. I knew there was a 

> problem because each time I left a light I'd hear a few "clunks" from 

> under the car. Well I replaced the bearing (in 2 hours -- new record 

> for me, not sure if that is a good thing) -- now the clunking is gone 

> ..... BUT .... Between 30-50 MPH I have one hell of a harmonic 

> vibration from the drive shaft. It is a high frequency so I know it's 

> the shaft. I double checked the shaft alignment -- it's right on -- I 

> know it's not the shaft itself because the vibration is only when I'm 

> on the gas (I also made sure it is stress free -- free floating 

> length). Coasting and  0-30 & 50-120MPH is perfectly smooth - no 

> vibrations. If it were the shaft I'd expect it to repeat from 60-100 

> (+/-). I know the bearing on the rear pinion input shaft has some 

> play. My theory is that when I'm on the gas, it goes off-center -- 

> forcing the drive shaft to oscillate -- which builds a harmonic in the 

> carrier bearing rubber mount.... Sorry -- I am Mechanical Engineer -- 

> so I get deep into these things. My other thought is I'll fab a solid 

> rubber mount -- I did that on my 380 SLC which solved the same issue, 

> but I realize it's a bandaid -- not solving the real issue.

>

>  

>

> Anyone have any thoughts or experience with this problem -- am I 

> barking up the wrong tree?

>

>  

>

> BTW: Sorry Jonathan. I waited until Wednesday but I did not hear from 

> you regarding the bearing & mount so I had to buy it from someone else 

> -- I had to have it by Friday. I hope I got a good part -- looks OK. 

> Next time I'll give more head-up. Thanks for offering to help & the 

> info is appreciated.

>

>  

>

> Thanks All,

>

>  

>

> Alex H

>

>  

>

> 89 560 SEC

>

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1991 560 SEC 226Hp/271ft/lbs (TT conversion IP)
1989 560 SEC Euro ECE *Parts*
1988 300 TE
1989 560 SEC AMG (Mech.lifter/radical cam conv.)
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1980 280 SE Euro
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