Do not be confused! the plastic black cylinder that comes with the new motor is packing!!!!even though it is similar in dimension to the brass bushing, and in fact basically serves the same function - that of a spacer.
So referring back to the second photo, you can see what is on the other side of the old face plate.
A kind of nozzle like part of the faceplate casting, followed by a thrust bearing (AETNA F3), and then the worm gear with the later two parts held on by a bolt. SO THE FUNCTION OF THE SPACER IS TO KEEP THE SHAFT IN THE PROPER POSITION SO THAT 1) THE REAR OF THE SHAFT STAYS IN THE BUSHING AT THE BACK OF THE MOTOR, AND 2) SO THE SHAFT AFTER IT COMES OUT ON THE FACE PLATE
HAS NO ROOM TO SHIFT ABOUT (ALLOWING THE THRUST BEARING TO COME APART), AND 3) ALLOWS THE LONG BOLTS THAT ATTACH THE MOTOR TO THE FACEPLATE TO BE TIGHTENED WHILE STILL NOT PREVENTING THE REVOLUTION OF THE SHAFT. yOU WILL RPOBABLY HAVE TO TAKE THE MOTOR AND FACEPLATE APART A FEW TIMES TO APPRECIATE THE NUANCES. WHEN YOU FIRST CONNECT THE MOTOR TO THE FACEPLATE (WITH THE THRUST BEARING AND WORM GEAR IN PLACE) WITH NO SPACER YOU WILL SEE THAT THE SHAFT CAN SLIDE BACK AND FORTH. IF YOU MEASURE THE DISTANCE OF THE SLIDE THAT IS THE CLOSE TO THE LENGTH OF THE SPACER NEEDED (SLIGHTY LESS, BUT NOT MUCH). GOOD LUCK
original "faceplate" and new motor.
by bob mitchell
Nov 22, 2022
Do not be confused! the plastic black cylinder that comes with the new motor is packing!!!!even though it is similar in dimension to the brass bushing, and in fact basically serves the same function - that of a spacer. So referring back to the second photo, you can see what is on the other side of the old face plate. A kind of nozzle like part of the faceplate casting, followed by a thrust bearing (AETNA F3), and then the worm gear with the later two parts held on by a bolt. SO THE FUNCTION OF THE SPACER IS TO KEEP THE SHAFT IN THE PROPER POSITION SO THAT 1) THE REAR OF THE SHAFT STAYS IN THE BUSHING AT THE BACK OF THE MOTOR, AND 2) SO THE SHAFT AFTER IT COMES OUT ON THE FACE PLATE HAS NO ROOM TO SHIFT ABOUT (ALLOWING THE THRUST BEARING TO COME APART), AND 3) ALLOWS THE LONG BOLTS THAT ATTACH THE MOTOR TO THE FACEPLATE TO BE TIGHTENED WHILE STILL NOT PREVENTING THE REVOLUTION OF THE SHAFT. yOU WILL RPOBABLY HAVE TO TAKE THE MOTOR AND FACEPLATE APART A FEW TIMES TO APPRECIATE THE NUANCES. WHEN YOU FIRST CONNECT THE MOTOR TO THE FACEPLATE (WITH THE THRUST BEARING AND WORM GEAR IN PLACE) WITH NO SPACER YOU WILL SEE THAT THE SHAFT CAN SLIDE BACK AND FORTH. IF YOU MEASURE THE DISTANCE OF THE SLIDE THAT IS THE CLOSE TO THE LENGTH OF THE SPACER NEEDED (SLIGHTY LESS, BUT NOT MUCH). GOOD LUCK