Upon conducting a machinery space round on a main propulsion diesel, you detect a significant amount of water discharge when blowing down the charge air cooler or scavenging air receiver drains. What should you do?

Correct Answer: Option C — Notify the watch or duty engineer immediately.

Excessive water accumulation in charge air coolers indicates jacket water or sea water boundary failures. This threatens catastrophic hydraulic lock and thermal shock, requiring immediate notification of the watch engineer for operational intervention.