5411 engine cooling
We have the 5411 engine in our 1983 Cat 30. People always point out the small amout of water spurted out as an indication of poor water circulation and cooling. Compared to most other boats, it is a small quantity. However, my engine never gets above 140-150 degrees, which is correct for a raw water cooled engine. This has been this way for over 15 years, including sailing/motoring down to the end of Baja from the central coast of CA. Just pay attention to the engine temp. Also, many 5411s shoot out some steam (white) which is normal. Some things to watch are the impeller and exhaust riser. The impeller should be checked yearly and the riser can clog up after 7-10 years. A visual check will show clogging, but our engine just would not increase RPMs. Easy black pipe fix though. Good little engine, just keeps going and going. We plumbed the sink to the engine water inlet (with valves) to flush it with fresh water after use.
