. The seals by the propeller.
I've only done two, but they were successful. Here are the simplified steps (it is a tricky job):
-Remove the prop.
-Remove the carrier bearing nut (a ring in the gear housing with notches): It threads in counter-clockwise,so to remove it insert a large screw driver in a notch and tap it out clockwise.
-Remove the bearing carrier (the piece that is in the housing, around the prop shaft): You can rent a slide hammer (if you can figure-out how to attach it to your prop shaft), or you can use this method: Cut some gently tapered shims from hard wood; Place an old circular saw blade over the prop shaft, add a large washer, and then the prop nut; Place wood block against the gear housing to create just enough space between the blocks and the saw blade to slide the shims in; Slide a shim in from both direction, so they over lap, with a set on each side of the prop shaft. Tap them in evenly until the bearing carrier frees-up and can be pulled out of the housing.
-Pull out the bearing carrier. Be careful to retrieve and save all the shims (thin rings) from the back side or the carrier.
-Pull the shaft out of the carrier.
-Drive the oil seal out of the carrier.
-Insert a new oil seal (lip out). Tap it in evenly. Replace o-ring on carrier.
-Install prop shaft
-Replace shims (thinest to thickest)
-Slide carrier back in; Rotate until gears mesh. Some say that reverse is best, so that you don't turn impeller backwards.
-Replace carrier nut, and tighten.
I say "simplified", because there are a lot of little details to be mindful of; you'll see.