hello, I've been trying to trouble-shoot a problem with my 124 E300D estate... about 2 months ago it started making a noise from the rear that sounds like an electric motor, mainly audible above around 20mph, increasing pitch with speed and not going away when coasting, suggesting it wasn't the diff but a bearing. Under 20mph, with the windows down, I can hear what sounds like a faint metallic 'swish swish' sound...

turns out after checking right rear bearing had play and was bad, and replaced it, but sound is the same. Other rear bearing has no play, and I've checked and topped-up diff oil.

Could the other bearing be bad without showing any obvious signs of play, or does it sound like something else?

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1993 320TE M104
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past:

1983 230E W123 M102
1994 E300D S124 OM606 (x2)
1967 250SE W108 M129
1972 280se 3.5 W108 M116
1980 280SE W116 M110
1980 350SE W116 M116
1992 300E W124 M103
1994 E280 W124 M104
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"music and women I cannot but give way to, whatever my business" -Pepys

anyone?

__________________
1993 320TE M104
---------------------------------------------------
past:

1983 230E W123 M102
1994 E300D S124 OM606 (x2)
1967 250SE W108 M129
1972 280se 3.5 W108 M116
1980 280SE W116 M110
1980 350SE W116 M116
1992 300E W124 M103
1994 E280 W124 M104
----------------------------------------------
"music and women I cannot but give way to, whatever my business" -Pepys