Rear Main seal leaking on Ford 641 Workmaster

I've identified my main oil leak on the bottom of the tractor, coming out a vent hole, as the rear main crankshaft seal going out. I've got a new one and I pulled the rear main bearing cap bolts to get it dropped down. Not moving... Looks like I have the tractor that you have to split the engine off of the case. I'm looking for any advice before I start blocking up the frame and start removing the cowling and accessories.
I'm thinking that if I have to remove the engine, it might time to overhaul the engine.
Also, does anyone have digital copies of a service manual for this series? I have most manuals of all my equipment, just not this tractor. Thanks for the ideas or help.
Russ, in Kansas...
 

Yes you have to split it. Victor Reinze 2 piece lip seal and Victor Reinze silicone on the sides.
 
If you suspect it's about overhaul time, you are probably right.

Often a leaking rear main is a symptom of other problems, like loose main bearings, and excess blow by.

Replacing just the seal could turn into a temporary fix if there are other problems.
 

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