Perhaps the clutch is stuck. Turning the bolt at the front of the engine causes the tractor to move forward slightly when the clutch is either depressed or undepressed. I will start working on the motor. At one time I think one of my kids put water in the diesel tank. I had tried to drain out just the water until the diesel ran free of water. However, I have not had it running since. About 3 or 4 years ago I had the injectors worked on but still no luck. Recently I still found a little water in the diesel tank I drained it completely and tried to let it dry for a few weeks. I will report if I can get the motor started. thanks for your help on the clutch diagnosis.