Hi,
the video gives you a step by step tutorial how to replace the engine mounts on your 944. The hydraulic engine mounts lose their damping capacity in time. A mount is worn to the limit, when the installed height is less than 62 mm or the height of the removed and detensioned mount is less than 65 mm.
http://www.youtube.com/watch?v=vlR2LUjSy4k
The video has a German soundtrack but English subtitles are added to YouTube. If you don't see them by default, watch the video directly at YouTube and press the subtitle button below the frame.
Enjoy it,
Jürgen