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Volvo introduced the so-called "hydraulic" engine mounts in '87. When they fail (and the DO fail), you'll get excessive engine vibration in the car. The engine sags slightly, so the pan will sometimes rub on the crossmember.
When the mounts failed in my '91 740 at around 150k, or so, I got an annoying "humming-drumming" vibration in the car at highway speeds -- 2500 rpm and above. For me, the engine noise was not offensive at lower engine speeds.
Look at the space between the pan and crossmember -- it should be at least 1/2" or more. If less, the mounts are failing.
Replacement is not difficult, although it's easiest done by removing one of the mount brackets from the crossmember (left side, I think).
The mounts aren't cheap. Check with FCP Groton for prices.
Many months ago we had a BB'er who tried to change the mounts on his 240 and, evidently because of an inability to think, damaged his oil pan. He jacked the engine up with a wood block directly under the drain plug and then wondered why his plug was pushed in. Of course, he thought it was our fault that his pan was dented.
For this reason I am not recommending for or against you changing your own mounts. A really good way to fix this problem is to take your car to a reliable Volvo shop. However, many BB'ers would probably attempt this straightforward, 1-hour repair themselves.
--
Don Foster (near Cape Cod, MA)
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