Here is the page from my Amel manual. Possibly yours is different. For the first 4 or 5 years I hauled Kimberlite every year and sanded the bottom and painted it. Now I do her every other year.
This summer I had the bottom paint removed to the Gel coat .
Every time she was out of the water, I also did the zincs, WOB with seals, line cutter, and bowthruster.
As we both know these are inexpensive items and I don’t understand the hubbub about trying to make the WOB last longer. I have always installed the seals with the 2 closest to the oil ( as per the drawing) with the spring side facing the oil , and the outboard one with the spring side facing the prop. Just goes to show you that your method and mine both work. If you look at the text in the drawing they use either 3 8 mm lip seals or 2 12 mm seals.
Looking forward to seeing you for the 4th.
I don’t understand why two years has any significance. The original Amel instructions were to change the wearing out bearing every 650 hours. How much the bearing wears is a function of engine hours not time. Any valid comparison test would need to for the same number of hours at the same engine speed.
For over 5000 engine hours, I have changed the wearing out bearing using lots of silicone grease and following the Amel instructions of the first bearing facing in and the outer two bearings facing out. I have done this (or Amel has done it) every 650 hours or so. I have never had any problem of water in the oil or loss of oil. I have had my boat since it was new and I learned early on that everything that Amel does or recommends is for a reason.
s/y Ladybug, sm 216, Le Marin Martinique