A boat's heat exchanger is like a car's radiator, except that raw water from the river, lake or sea cools the engine's coolant instead of air. The raw water side blocks up with salt, weed and shells, and corrodes. In this video Pete and I clean and repair the heat exchanger from the Vetus diesel in his Halvorsen 36.

Once it's repaired, we pressure test it, put it back in the Halvorsen and go for a test drive.