I have an Ariens riding mower, 48 inch cut. I was using the mower to pick up leaves when it abruptly stopped. Initially, I thought the engine had seized, but after a few days, I was able to turn the engine over, but heard a grinding sound. I determined that my PTO clutch was shot. When I removed it from the mower, the ball bearings were missing and chewed up. I consulted a local small engine repair shop and was told it needed to be replaced. I know the engine runs as I was able to start it without the clutch. I installed the new clutch, but now the engine won't crank. I get one rotation of the engine and then it stops. What did I do wrong?