Based on your description of the noises I am inclined to be confident
the outer bearing is bad - we get a loud growling noise starting at
45mph or so and getting worse and speed increases. But I don't recall
any vibrations on accel / decel or clunks as you describe.
The CV joint is a question though - are the axles sold as complete units
with new CVs at each end? Never mind - I can look on Pelican, etc.
I have changed Axle shafts on FWD cars when the CVs started clicking -
the old shaft popped out and the new one popped in - is it the same with
W124?
Also, let's say I get the carriers off and it's not damaged so it can't
be reused. If I rotate the axle shaft will that tell me anything about
the condition of the CVs?
Larry
On 07/21/2018 8:59 AM, Peter Frederick via Mercedes wrote:
A bad bearing can damage the wheel carrier, or at least "grow" enough to be
very difficult to get out -- had that happen a time or two.
Basically the bearing is a double row ball bearing with one side free (so it
can be assembled) -- the axle nut holds it together.
The nub is pressed into the center, and unless you've stripped a bolt hole or
it's badly corroded, it's perfectly re-usable.
Check the axle for a bad CV joint before condemning the bearing though -- if
there is ANY rotational play between joints and shaft one end or the other is
shot. Typically the inner end, which is a tripod design, goes long before the
outer Rzeppa joint does, but they can both go bad. The inner causes vibration
on acceleration and/or deceleration and clunks when you put it in gear, the
outer usually starts grinding with the noise most noticable at speeds around
50-60 mph.
I'm replacing an axle in the Golf this weekend for that reason -- the inner
Rzeppa is grinding.
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