Hi, i just finnished of a rebuild
Mine was in my garage so the job was easy for me.
The answer is yes, you can replace it without lifting the engine.
The difficulty will be based on how much soace you have behind the engine.
This is what you need to do (pardon my spelling and gramatic errors.
* loosen and push back your propeller
* loosen the gear
box. It sits with six screws if it is the wurth gear
* remove the “clutchplate”. Think this one also has six screws in it.
* remove the flywheel buttom cover. Sitts with two screws.
* remove the flywheel.
Now you have access to the “gasket”. It sitts with two longer screws.
Take it out, replace the seal. I recomend that you put grafitt grease on it before you put the parts
With the engine out the whole operation takes about one hour, with the limited space. I would buy some beer
. Put on some music
and just take it step by step.
It is really easy, and i would say anyone can do the job.