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

[Alexander Hochhausl]

Well, (reg. the LSD) when I do break traction, both rears leave the same
marks. I don't want to make it sound like I abuse cars, but I do make
them prove their name. One the flip side I take excellent care of them. 
 
. btw - they started it - I just finished it..
 
Thank You,
 
Alexander Hochhausl, PE
Tel: 516-909-3794
 
-----Original Message-----
From: mbcoupes-bounces at mbcoupes.com
[mailto:mbcoupes-bounces at mbcoupes.com] On Behalf Of Jonathan
Sent: Sunday, March 16, 2008 2:17 PM
To: Mercedes Coupes Mailing Lists
Subject: Re: [W126 Coupe] ... fix one problem - find another
 
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





  _____  



 
The MB Coupes Website!
W126 SEC Mailing List
Postings remain property of MB Coupes, L.L.C.




-- 
Blue Ridge Mercedes
Offering Enthusiast Service, Restoration and Modification.
Providing quality parts to discriminating customers in all parts of the
world.
Located in the Greater Atlanta area.
http://www.blueridgemb.com
*Updates weekly*
 
1996 S600 Euro "Scharnhorst"
1991 560 SEC Euro ECE Conv. (for sale)
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.)
1987 AMG Hammer 6.0L 32V
1986 560 SEL 6.0L 32V AMG
1980 280 SE Euro
2006 Z4 3.0Si M-Spec
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.pairlist.net/pipermail/mbcoupes/attachments/20080316/680e7a77/attachment.html>