If a diesel engine has been stopped because of piston seizure due to severe overheating, the crankcase __________.

Correct Answer: Option A — inspection covers should not be opened until the engine has cooled

Opening crankcase doors on a severely overheated engine introduces fresh oxygen to atomized oil vapor and hot metal surfaces, creating an immediate, catastrophic crankcase explosion hazard. Standard marine safety protocols require the engine to cool thoroughly before inspection.