I'm hearing a whine/mumming sound comming from the front passenger side. I jacked up the front and checked the wheels and find no play at all. Could this still be a bad bearing or is it something else. I also swapped the tires to no avail..

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85 300TDT 456,000 orig. miles

Only one way to find out is to check the bearing. When was the last time you had them repacked ?

Little over a year ago, mechanic said they were fine. Replaced the rotor at the time.

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85 300TDT 456,000 orig. miles

I've been fooled more than once with a humming noise thinking I needed new bearings when it turned out I needed new brakes.

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95 E320 Cabriolet, 159K

I just replace both front and rear brakes along with a tie rod on the same side that is making the noise.

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85 300TDT 456,000 orig. miles

Ahh, in a "normal" vehicle, you can steer from left to right, slalom style, and if you heat the bearing noise louder while turning say left, it's usually the right side bearing(weight thrown on that side).

I don't know if this applies to MB.

What's the bearing repack interval for these things? I hope it's kinda long if I have to set the play with a dial indicator..

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One more Radar Lover gone...
1982 VW Caddy diesel 406K 1.9L AAZ
1994 E320 195K

WITH THE HIGH MILEAGE, I WOULD DEFINATALY REPLACED BOTH FRONT WHEEL BEARING AND RACES. I HAD THE SAME PROBLEM WITH MY 85 123.
THEIR NOT EXPENSIVE AT ALL
GOOD LUCK

Thanks to all who responded. I had both front wheel bearings replaced today. Fixed.... Thanks again.

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85 300TDT 456,000 orig. miles