I have been noticing over the past 12 months or so an accumulation of "powdery" looking deposits forming around the gasket
line of the plates that the engine
anodes are fitted to. This is a Yanmar 2QM20
, raw water
. These powdery deposits are only on the joins where the anodes are, not on any other bolt on plates. The anodes will be down to about 40% after 2 years, and this rate of erosion has not changed. I have not altered the electrical system
in any way lately; the shaft anode erosion has stayed constant. I am on a swing mooring
so no vessels nearby.
The pictures show what the anode looked like when removed. The engine/head metal is still solid with no indication of wasting. The powder is very similar to what you see on the terminals of a battery
Should I be worried? Or are the anodes doing exactly what they are supposed to do - sacrifice themselves?
The electrolysis/power cleaned off easily, and I fitted a new anode and refitted it all.