Re: Raw Water Cooled for 35 Years?
I'm not up on chemistry but yes, the white precipitation would be from salts in the salt water. And again, yes, it certainly could be sealing and protecting the bare metal underneath, so if it isn't creating a problem, letting it alone might be the best thing.
I understand that everything gets built to a price, but raw water engines....I just cringe that they are so popular. That's a mean thing to do to an engine, especially since those mineral buildups start at about 140F and engines simply are more efficient when running at 180-210F, which can't be done on raw salt water.
I guess no one really was thinking about "You know, this boat could last fifty years" when they spec'd raw water.