You will recall we added temperature sensors to the raw water pumps on the engines, and to the exhaust water injection elbows. The concept was that this should provide early indication of a cooling issue. With a five degree F delta shown above, we decided to check the port engine pump.
We found the long life Globe impeller had tears in three of the blades, hence less water flow and more heat. So the early indication system works. This leaves a question of how long an impeller in this condition would last? With this experience validating the heat watch concept, we are going to add sensors in a variety of additional areas. We will also be installing a pair of “roving” sensors on long leads for special situations. One of these has a magnetic probe and the other has an alligator clip.
We are now working with Maretron to see what can be done to optimize their software for this type of monitoring. It will be interesting to see how it all turns out.