For W124 models with non-V8 engines, there is an easy method to check if the hydraulic engine mounts have collapsed. This factory document shows how to measure the mounts if the distance is below spec, the mount is bad, and should be replaced. Again, this procedure only works on 124's with 4/5/6 cyl engines, not the V8.
The cost of replacing the engine mounts depends on the mechanic's man hours and the cost of replacement parts. Normally a good mechanic takes 3 or 4 hours for the whole intervention and the replacement engine mounts cost 100 euros for the whole set. The cost of the total replacement of the engine mounts should therefore be around 300 euros.
Identify Failed Engine Mount. Using a flashlight identify the engine mount to be replaced. In the image below we show a torque style of engine mount which have a high failure rate due to excessive engine movement under load. You can see the right side bushing is worn allowing the engine to have excessive lateral movement. 3. Remove the Engine Mount
While researching pinion angles, I read that factory design set the engine angle at 3°. So if you put your angle finder on the intake carb flange and set the engine so that the angle finder reads 0° the engine will have the proper down angle. This it exactly what use. There is a reason the intake pad isn't level.
Once the old engine mount is removed, you can install the new engine mount. Bolt the new engine mount into place, making sure it is tight. After the new engine mount is installed, start the engine and see if the vibration is gone. If the vibration is still present, you may need to check other engine mounts or other components.
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how to check engine mounts
