I have just got myself a good condition 300D W124 non turbo and find it very irritating to drive as the engine exhibits a strong vibration around 1500 - 1600 rpm when under load . Is this 'normal' for this engine? My OM617 's don't show this behavior.
Peter
It's not normal for the engine. Do you get the same vibration when revving the engine in neutral? If not, the problem is more likely stemming from improper alignment or wheel balance, or possibly driveshaft vibration. If it does, it could be as simple as motor mounts. PM me if you like.
Does your 124 have a propshaft vibration damper just behind the front flexable coupler. My mechanic tells me I should have one even though the EPC says its not required.
Peter