The main propulsion diesel engine jacket water temperature rises above normal, with the raw water sea suction and the expansion tank water level being normal. Which of the following problems is most likely the cause?
ā¢ Closed vs. open cooling systems and what the expansion tank level tells you ā¢ How a thermostatic bypass valve affects jacket water temperature and flow ā¢ Typical symptoms of leaks vs. restrictions in jacket water circulation
ā¢ If sea suction flow and expansion tank level are normal, what does that say about raw water side vs. jacket water side problems? ā¢ Which option would most directly cause the jacket water to get hotter while still keeping the system apparently full? ā¢ For each choice, ask yourself: would this raise, lower, or have little effect on the jacket water temperature under normal load?
ā¢ Confirm what a normal expansion tank level indicates about coolant quantity and presence of steam ā¢ Consider whether steam formation can exist with a stable, normal level in the expansion tank ā¢ Think through how a bypass valve stuck in one position (open or closed) would change engine temperature and why
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