With a Yamaha 60 of 20 years, have only moved it up or down a couple of times to play with trim. Each time used Sikaflex around the transom holes and a bit of Duralac on the bolts/washers. Have not had any noticeable corrosion, even though the bolts are stainless amd I guess the outboard is alloy. There is also a sacrificial zinc anode very close by on the outboard, which lasts maybe 5+ years, so that is probably the main thing neutralising any galvanics.
Rob H
Posts: 5806
Date Joined: 18/01/12
Generally heavily coated in
Generally heavily coated in Sikaflex, unless the boat lives in the water maybe.
Nylon washers do tend to crush out over time leaving your mounting bolts losing their torque
A starboard/HDPE pad is more for noise and a little crush area (I have 2 left over at home 10mm HDPE if anyone needs some)
Give a man a mask, and he'll show you his true face...
The older you get the more you realize that no one has a f++king clue what they're doing.
Everyone's just winging it.
Reefsta
Posts: 321
Date Joined: 03/08/19
Anode, Sika, Duralac
With a Yamaha 60 of 20 years, have only moved it up or down a couple of times to play with trim. Each time used Sikaflex around the transom holes and a bit of Duralac on the bolts/washers. Have not had any noticeable corrosion, even though the bolts are stainless amd I guess the outboard is alloy. There is also a sacrificial zinc anode very close by on the outboard, which lasts maybe 5+ years, so that is probably the main thing neutralising any galvanics.