There is a special tool made that makes this an easy job, hopefully someone here still makes them. Are you sure the upper seal is bad? These engines have a crazy oil recirculation/removal system that is sometimes to blame….
Fleetwin, Pretty sure it’s leaking as there is a lot of gray residue on everything below the mag plate ? We’ve removed the fly because we thought the lower spark plug wasn’t firing, new coils, points and condensers ! Good spark on both plugs ! When we turn the flywheel over be hand, you can hear the seal leaking, it makes a squishy sound like air going in and out ! So suspect the seal is bad causing lean mixture and not firing ? Thoughts ?
Just looked up the top seal for the crankshaft, I thought the carbon part of the seal rides against a ceramic disk like in a well pump, but it appears it actually rides against the top of the upper needle bearing ? And the needle bearing has a special ground surface for it to ride against ! Also I just remembered when we pulled that flywheel, there was no spring or washers that would hold the carbon part of the seal against the bearing surface, it’s all missing ?
That motor uses the carbon seal, well a carbon case with a plain o-ring inside…I tend to use 2 curved picks to gently hook opposite sides, then gently pull upwards.