After a main diesel engine on your vessel has experienced a safety shutdown due to excessive crank-case pressure, why is it important to wait 2 hours before opening the crankcase to investigate the cause of the trip?
• Crankcase explosions in large diesel engines • What happens to oil mist, hot spots, and residual heat after a safety shutdown • Why engine manufacturers and class rules require a cooling/settling period before opening the crankcase doors
• Ask yourself what dangerous conditions might still exist inside the crankcase immediately after a shutdown caused by high crankcase pressure. • Think about how hot surfaces and oil mist could interact if you suddenly introduce fresh air by opening a crankcase door. • Which option describes a hazard that directly matches the reason for having relief valves, oil-mist detectors, and waiting times on large main engines?
• Verify which choice is directly related to fire and explosion risk inside the crankcase, not just mechanical motion. • Consider whether a main engine can spontaneously restart with all normal safety systems still tripped and the control lever in stop. • Check which option aligns with the standard safety practice: keep the crankcase closed to let vapors dissipate and hot spots cool before opening.
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