A beverage fill valve actuator adapted for being sealing mounted thru the wall of a beverage fill tank, the actuator having an elongated housing formed with an axial bore extending completely therethrough and providing a tubulate bearing structure at its inner end, a camshaft rotatably mounted in the bore and having its distal end rotatably mounted within the bearing structure with a predesigned selected clearance therebetween, and wherein the camshaft, bearing and barrel structures allow axial motion of the camshaft within the bore of from about 0.002 in. to about 0.020 in. while maintaining the selected clearance.