Three Questions:

1: how do I remove the fan clutch from the pulley on a 104.991?

2: If oil is coming into the intake through vacuum out of the crankcase, what is the cause of this?

3: Do I have to replace the oil pan gasket after removing and installing lower timing cover to replace front main seal? (it is leaking and throwing oil all over the place)

I put these questions in summary form in hopes for some help. These oil leaks are driving me nuts! Any help would be appreciated!
Regards,
Brian