Replace heat exchanger

During the three seasons since new, the heat exchanger has developed small corrosion pits at the front cap for the tube stack. The tube stack itself and the inside of the heat exchanger were fine. To their credit, Vetus sent a complete new heat exchanger without any discussion whatsoever. It looks slightly different from the original one.
The o-rings for the end caps are 61×2.5. The end caps of the new heat exchanger are brass instead of the original plastic.

As with most new engines, it does not have any sacrificial zincs. All the manufacturers claim that the alloy shall withstand corrosion. Well, I’ve fitted zincs anyway…


Old heat exchanger


New heat exchanger


New. Aft end cap.


New. Fwd end cap.

Old. Corrosion of housing at o-ring.

Old. Corrosion of housing at o-ring.