I posted about this a while ago, and thank you very much for your input
then. Since then it's been an intermittant problem. Each time it goes
away, I think what was done last fixed it, and then it comes back, etc.
Actual hardware replacement to date has only been the flex disc on the front
of the drive shaft. The rear one had no play in it. There were also loose
bolts on the CV joint on the left rear axel. I have a buddy who is good
with wrenches and he has the car now to see what he thinks. I got this
email from him this morning.
"the wheel and bearings are tight and the noise is not coming from either of
I checked the oil level in the differential, checked the bearings with a
stethoscope and rechecked all the control arms. Differential oil was fine.
All the control arm bushings and bolts are ok. There is a very similar noise
from the left rear if you slide the axle left and right, it hammers against
the left wheel bearing. The right axle doesn't do this. I found no noise
from the wheel bearing and only a very light noise from the differential, it
matched the noise I heard on Saturday. I think it is the axle tapping on the
wheel bearing. To take it one step further I would have to remove the axle
and see if the noise goes away. By the way, the noise is on the left side,
not right, of the differential and doesn't sound like a bearing. There is
also noticeable run-out in the left axle, as if it were bent. The right side
Now that I have checked the brakes and wheels, driving it additionally will
not cause further harm for the short term.
"Rebuilt axles" I have had a lot of experience with these. Some good, some
not so good. There is a reason Mercedes does not provide repair parts for
these. If the part fails under warranty, they are responsible. Typically,
anyone would take the least expensive route to repair any problem. I have to
think that if Ford and GM provide these parts, Mercedes would also if it
were a good idea."
So there you have it. If there's enought information in it for anybody to
hazzard a guess as to what is causing the noise, I'd appreciate hearing what
you have to say. My take on it now is to replace the axel with a new, nor
rebuilt one, and see if that does it.
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