2 kindsa belts, one has a smooth side, other is bumpy as swmbo's gravy on both sidesHow? I would try an epoxy in the cracks and clamp it together. Are the threads stripped? In the left of that pic it looks like the belt - installed backwards? I thought the teeth went went around the sheaves or is it a trick of my eyes? You say the drain plug boss is cracked also? How much torque did you use?
also that's a hefty chunk of aluminiminiminim , recycle it , gonna be worth a dollar or two.