During a routine round of a diesel engine generator, you observe a low oil level in the governor sump. If there is no visible sign of external leakage, you should suspect the cause to be a/an __________.
• Governor sump oil level behavior in normal operation • Difference between internal leakage into engine oil system vs external leakage to atmosphere • Function and location of sight glass, vents, and shaft/piston seals on a governor
• If there is no oil visible on the outside, where else could the missing oil realistically go from the governor sump? • Which listed component, if faulty, would move oil to another closed system rather than letting it drip or spray outside? • How would a problem with the sight glass or its gasket normally present itself when you inspect the governor casing?
• Match each choice to whether it would cause visible external oil traces vs. hidden oil transfer • Consider which part is connected to the engine lubricating oil system or crankcase versus just the atmosphere • Think about how a ventilation orifice or a sight glass defect would change what you see during your round (smell, mist, drips, staining)
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