Jerry,
He has a stand alone Uline ice maker an it is totally different that the refrigerator mounted unit that you have. In the Uline, the cooling coils are around the try assembly.
Roy,
The only thing that I can think of without a better explanation of the noise is that the fill valve is cycling to refill the tray after it empties. The valve will make a clunk noise in the water lines when it abruptly stops the water flow.
Gerald