How do you remove the prop seal on a 1968 mercury 60 outboard?

With the prop removed, you will expose the bearing carrier retaining nut. This nut must be removed, (screwed out of the housing), it has righthand threads. With a puller, the carrier can now be removed from the gear housing. The propshaft seal(s) can now be removed, and replaced with new. Be sure to replace the carrier o-ring while you have the carrier out. Use a sealer, such as gel seal on the outside edge of your prop seals when you install them. Also, don't be afraid to use some grease when you reinstall the carrier and retaining nut.