9N upper Crank seals

If you had a leaking rear main seal here is a way to fix it without pulling the crankshaft assuming that the crankshaft is good. If it wasn't leaking it won't leak with new bearings installed since the new bearing will raise the crankshaft a little if the old ones were worn.

Here is my file on a fix that I have done in times past with sucess when the rear main did leak.

To replace the top rear main seal it next to impossible to remove the old one or install the new one with the crankshaft in the engine. The old one will be stuck to the seal retainer because it is aluminum and you know what that stuff does when it is mated to a dissimilar material for a long time. You may also have too much wear on the crankshaft rear journal to ever stop the leak without an engine rebuild and crank regrind.
There is however a way to repair the rear main seal without removing or replacing it.
The TO Ferguson tractors have a cotton roping seal at the top rear main seal. It is a soft loosely woven rope about the size of a pencil or so and it is installed by simply using a soft punch to pack it into the top seal retainer. First you use the soft punch to pack the old seal up into the retainer as far as is possible before starting to pack in the roping. Using a soft punch made of a welding rod etc and being careful not to strike the crankshaft and score it pack the cotton roping into the seal retainer behind the old seal until no more can be packed in. Do this on both sides of the top seal.This will make the old portion of the seal again come in contact with the sealing surface of the crankshaft and then just install a new half in the bottom and bolt on the bearing cap.
I have done this repair many times in the past and never had a leak. The cotton roping is all that the new TO Ferguson tractors ever had from the factory. The engine in them is a Contenintal engine.