While proceeding in open waters to a ship...

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Question 1 of 2066636eef28f7522a1c520144

While proceeding in open waters to a ship requiring docking assistance, one of the main engines on your ship-docking tug overheats. The high jacket water temperature alarm sounds, the freshwater thermometers indicate out of range (high), and the expansion tank level sight glass indicates out of range (high) with vapor bubbles forming and escaping through the vent. What is the appropriate initial response?

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Question 1 of 20

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🔍 Key Concepts

• Engine cooling system behavior when jacket water temperature is high and expansion tank level is also high • Difference between reducing load, immediate shutdown, and adding/removing coolant under overheating conditions • Risk of thermal shock or mechanical damage if cooling water level or temperature is changed too quickly

💭 Think About

• What does a high level in the expansion tank with vapor bubbles tell you about the coolant’s state and pressure inside the system? • In an emergency approach to a ship, how do you balance protecting the engine against damage with maintaining some maneuverability? • Which action directly reduces heat generation in the engine without suddenly changing the coolant volume or temperature?

✅ Before You Answer

• Verify what a rising coolant level and visible vapor in the expansion tank usually indicates in a closed cooling system. • Consider whether it is safe to add or drain water from a hot, pressurized coolant system showing signs of boiling. • Compare which response is recommended as the first action in standard marine engine operation manuals when jacket water temperature and expansion tank level are both high.

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