Possible.  The eldest son’s W124 diesel (95 E300D) had a really weird knock 
that did not correspond to any particular speed or driving type which ended up 
being the center bearing mount.  Strangest thing I’ve ever seen/heard.

Definitely worth a look.

-D


> On Sep 29, 2018, at 5:05 PM, Max Dillon via Mercedes <mercedes@okiebenz.com> 
> wrote:
> 
> Installed that axle Wednesday night, but the knock from the rear of the car 
> remains.  
> 
> The knock is most pronounced when the car is fully warmed up, during a hard 
> acceleration from a stop while turning left.  Knock frequency is low and 
> regular, and increases with engine speed.  I'm thinking maybe the other axle 
> shaft is bad (right side) or maybe the center carrier bearing / support?
> 
> I'm going to try weaving back and forth at highway speed to see if I can 
> narrow it down to the right rear axle.  
> 
> If the support for the carrier bearing is bad, could that be the source?
> -- 
> Max Dillon
> Charleston SC
> '87 300TD
> '95 E300
> 
> On September 27, 2018 8:32:56 AM EDT, MG via Mercedes <mercedes@okiebenz.com> 
> wrote:
>> It is, as long as you have a way to lift the 
>> car enough to do the work under it.
>> 
>> MG
>> 
>> Meade Dillon via Mercedes wrote:
>>> Yesterday afternoon I visited the SEMRA (South East Mercedes Rescue
>>> Association) storage deposit to retrieve a half-axle for my 124.193. 
>> The
>>> mission was to remove an axle from a complete rear-axle sub-frame
>> assembly,
>>> which included all the parts from the differential out to the brake
>>> calipers and all the suspension bits.
>>> 
>>> Armed with only hand tools, Aero-Kroil and brake cleaner, the axle
>> nut at
>>> the wheel carrier proved to be a tough nut to get off.  I struggled
>> to get
>>> enough leverage to hold the sub-frame assembly while using a breaker
>> bar on
>>> the nut.  Even worse, the cheapo 30mm 12-pt socket from Hazard
>> Fraught was
>>> not a really nice tight fit and the nut faces were rather shallow, so
>>> slipping and rounding off the nut was a real risk.  Fortunately the
>> brake
>>> pads were rusted in place on the caliper, so I didn't have to deal
>> with the
>>> nut/axle/differential all turning with the torque from the breaker
>> bar.
>>> 
>>> Finally I figured out how to wedge a short board into the assembly so
>> that
>>> I could get that nut loose.  After that I only had to remove the six
>> bolts
>>> holding the other end of the axle to the stub on the side of the
>> diff,
>>> which was easy enough if a little awkward.  Used a broken broom stick
>> and a
>>> hammer to drive the end of the axle out of the wheel carrier, and
>> then
>>> clean up and put the tools away and done.
>>> 
>>> Bottom line: it should be a lot easier to do all this axle work when
>> the
>>> sub-frame is still mounted under a car.
>>> -------------
>>> Max
>>> Charleston SC
>>> _______________________________________
>>> http://www.okiebenz.com
>>> 
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>>> 
>> 
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> _______________________________________
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> 
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