I have significant constant whine on my Brand New (to me) 2011 GL350. It very much sounds like wheel bearings (more so in front than rear), so I'm changing both front bearings.

As a side note, this is already the most difficult repair I've experienced on any Mercedes to date. I broke two breaker bars on the axle nut alone. (I finally have a set of 3/4" drive impact sockets, never needed before). Lower ball joint is difficult to access, and joint spins inside the nut once nut is loosened...etc.

The bearings don't seem bad, and CV joints are sealed and feel good. I'm replacing both front bearings, both front half shafts, and both lower ball joints (just cause I'm in there).

My question for the group, the abs pickup sensor is near the inner race of the bearing. It's a National 510097 bearing, and it's absolutely symmetrical...no difference from one side to the other, with the exception of the model number printed on one inner race. Is there an orientation to this bearing, or will the abs sensor pick up properly regardless or orientation?

I searched 510097 and find no references at all to orientation. I don't want to press this in just to get a dashboard full of abs messages.


Thanks

Mark

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Mark in MA
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