The steering vibration when driving over bumps had re-appeard again on my '86 300E recently. It turns out that the front shock mounts were damaged and torn. I guess most of the load was on the steering damper which had caused it to go bad eventually in the fisrt place.

I replaced the shock mounts and the problem is fixed.

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Zorin

'88 Benz 420 SEL
'79 Porsche 911SC ('87 Carrera Engine)
'00 BMW 540 Sports Package
'99 Land Rover Discovery

86 300E - Manual (sold)
88 260E (sold)
84 944 (sold)