You have two gel filled mounts. They split and leak out the glycol gel, and the engine shakes.

Replacement is fairly easy if you can get to them. I'm not familiar with that model, but there is most likely a bolt top and bottom, the mount itself is a fairly large metal and rubber item about the size of a softball.

To replace them, you have to jack up the engine a few inches and remove the upper and lower bolts. Top is likely a 19mm hex head, the bottom is likely an 8mm cap screw (Allen head). Lift engine until you can get the mount out, then jack another inch or so so the new one will fit in (maybe more!). They are indexed with a pair of ridges on top and only fit one way, make sure they are in correctly, then tighten the bolts. Watch that you don't drop the bottom screw into the frame, it's a bear to get out.

Best to use an engine hoist and the lift eyes or a floor jack on the oil pan with a board between to lift the engine.

The main difficulty is reaching the top bolt on some models. V8 engines and turbodiesels really cannot be reached from the top.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!