Replaced the starter and the difference was like night and day. Cranks really fast and didn't wear out the battery. It started with just a little burst of starting fluid. After running for a minute or so, we noticed coolant coming out the overflow "spout" - no hose connected. We opened the cap and coolant was bubbling and flying out of the radiator. We shut the tractor down. I hadn't noticed this previously because the level was low. I added almost a gallon to fill it up today. We're thinking the head gasket is damaged. I'm hoping that this is the only problem. Planning to start taking it apart tomorrow afternoon. Does anyone have the alphanumeric part number for the gasket? The NH site just has 82845200. The other sites have numbers like E0NN6051AA. NH wants $62 for one. It's a 1967 3 cylinder diesel.