In addition to keeping the engine firmly attached to the vessel in which it's installed, the motor mounts also allow for the adjustment of engine alignment. Rotating the adjustment nut on the mount stud enables a mechanic or savvy do-it-yourselfer to move any one of the engine's four corners up or down to align the shaft coupling with the transmission output coupling. Once the alignment is set, it rarely has to be adjusted-but herein lies the problem: With disuse, any mechanical component can become cranky. You may find, when the day comes to use them, that the mounts are frozen solid with years of accumulated corrosion. Inspect your mounts: If they're not new, make sure they're free to move. At this time, you may as well check the alignment, and don't forget to secure them in place with the locknuts. When you're done, spray the mounts liberally with a non-petroleum-based corrosion inhibitor, such as CRC's 6-56, to keep rust at bay. Petroleum-based lubricants and rust preventatives may attack the mount's rubber shock absorber.