Small Engines (Lawn Mowers, etc.): How to remove B&S PTO end vertical crank oil seal, crank shaft, cam shaft

Question
Engine is a B&S 20hp VTwin 351777-1044-EZ (vertical crank)
Code date: 00 05 1911
The crank shaft (PTO end) oil seal has begun to leak.

Can the leaking seal be removed without removing the entire sump?
If so, is a special tool required, or will something like an "O"-ring pick be used to get behind the seal and pull it out of its counterbore in the bottom of the sump casting?

Thank you for your time & knowledge.

Answer
Mike

After removing what you need to get to the seal.Drill 2 x 1/8 " holes into
metal seal outer and screw in 2 self tapping screws and use 2 levers or vise grips to pull seal from housing

When refitting seal besure to protect the sealing lip from being cut while ftting and tapping down square and flush with housing

as to replacing bush - bigger job than you might want to take on
would require engine removal, draining, removing cover plate and starter and flywheel as well as cyl head - removing cam shaft and removing crank , press out and fitting new one , staking down -checking clearance and reassemble and retime etc