While at sea, the first engineer reports the...

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Question 1 of 205eccefa3bacbc34ba4d47e0d

While at sea, the first engineer reports the jacket water expansion tank water has become discolored and has a smell of exhaust on a slow speed two stroke engine. Which would be the most likely cause?

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🔍 Key Concepts

• Heat exchanger and cooling water system layout on a slow-speed two-stroke engine • How exhaust gases could physically reach the jacket water expansion tank • Differences between internal leaks into cooling water vs external exhaust leaks

💭 Think About

• Trace the path of jacket (fresh) water around the engine and ask where it is in close contact with high-pressure combustion or exhaust gases • For each option, consider: would this fault allow exhaust gas to mix directly with jacket water, or just leak to atmosphere/another system? • Decide which component, if cracked or leaking, could allow exhaust gas to enter the closed cooling circuit and then show up (smell/colour) in the expansion tank

✅ Before You Answer

• Identify which listed components are actually in direct contact with jacket water during normal operation • Check which faults would only cause an external exhaust leak without contaminating the cooling water • Verify which option involves a part that has a cooling water space on one side and combustion/exhaust gas on the other, separated only by metal that could crack

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