13-03-2021, 05:21 PM
(13-03-2021, 05:04 PM)Bruce Nicholls Wrote: The aluminium water manifolds will tend to act as anodes as seen by the eaten away condition of many. Not sure if adding extra anodes, either zinc or aluminium would affect this or add more protection to the block.
A Zinc sacrificial anode should protect the Aluminium. On professional advice, I fitted Zinc sacrificial anodes to a machined from Ali billet widget that normally lives under water on a mate's boat. The last time the boat came out the water for its dry dock anti fouling ritual, the anodes needed replacing but the Bow Thruster gearbox casing that I had made was still OK.