D2 5u main clutch

I'd guess at runout on the coupling between the clutch spigot and the transmission input. The clutch disk should basically not move in both the engaged and disengaged positions. Put the clutch assembly in a pair of v-blocks and check it for runout, also check the input shaft, and then check the clutch output spigot when the coupling is attached. They need to be concentric
For the water in the transmission, if there's no rain ingress, then perhaps you have a condensation issue, but that would only occur if you put it away hot in a humid climate

Something simple to over look is remember to always have your clutch engaged, only disengage when needing to put it in gear. If you run the diesel with the clutch disengage for long periods of time it can start to shift/walk eventually stripping the teeth off just something simple to check and remember to do.

In regards to the water in the transmission during storage under cover. Redwoods grow and thrive in the heavy costal fog areas, in fact the leaves are designed to capture that condensation. In costal fog you have air that is at or near its maximum capacity to hold water at the given air temperature, generally with costal fog and inland tule fog the air temperature and dew point tend to track each other. Then you have all of that cast iron gets cold at night so it’s colder than the dew point during the day and you end up with condensation forming inside of the tractor. That’s why frozen clutch packs, stuck injection racks and injection pumps become quite common in tractors found in this environment / region. Things in this environment rust from the inside out, even when stored under cover. A very famous Gold Rush writer had some choice words about that areas climate when stuck in the Mendocino Redwood sawmill region, might not be what people assume the climate is based on how it is 500 miles to the south😊

thanks for the responses. heard from someone years ago about not leaving the clutch disengaged ,thanks. I will probably need some more help when I get it apart this winter and get a good look at everything.

thanks for the responses. heard from someone years ago about not leaving the clutch disengaged ,thanks. I will probably need some more help when I get it apart this winter and get a good look at everything.

This is what happens to your clutch when it is not properly engaged. Ask me how I know. This picture shows the missing teeth. [attachment=78054]IMG_2944.jpeg[/attachment] [attachment=78054]IMG_2944.jpeg[/attachment]