The mounts collapse when the rubber fails and the glycol leaks out.

Visible symptoms of failure are:

Glycol (sticky oily stuff with very little odor) all over the lower part of the mount and frame

Less than 1" or so clearance between the largest diameter of the mount and the frame

Trapezoidal steel fitting on the bottom not visible on the bottom.

The left side is easy, right side requires access from underneath, its directly under the turbo and there is NO way to get to it from the top.

I'd bet they are both flat, and I'd consider replacing the rear tranny mount too!

Watch for the hole in the frame right next to the bottom engine mount bolt -- it's possible to "fumble" the bolt and drop it into the frame section, and it's a real bear to get back out.....

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!