Grease in the vacuum motor isn't a good idea. We used to use Casite Tune-up, in the 6-oz. can to free up vacuum wiper motors, and also the vacuum-assisted shifters on old Chevy passenger cars. The valve that shifts the vacuum from one side of the paddle to the other was bad about getting gummy, and needed as much, or more cleanup than the paddle assembly did. Put a short section of vacuum tubing on the open port of the vacuum motor, and submerge it in the tune-up oil. As the vacuum draws it through the motor, and the control valve, it cleans and lubes the whole assembly, then goes into the intake manifold, and cleans the valve stems on the way into the combustion chamber. Any lightweight tune-up oil, like Rislone, for instance, will work, if Casite isn't available.
Jerry
