During your watch you observe that Main Engine L.O. sump level is rising due to contamination of lubricating oil. Describe the procedure to:\n
(a) Identify the contaminant.\n\n(6)\n
(b) Locate the cause of contamination\n\n(6)\n
(c) Action to make the oil suitable for its continued usage.\n\n(4)
Reference Answer
### (a) Procedure to Identify the Contaminant (6 Marks) A rising level in the Main Engine lubricating oil sump is a critical situation indicating contamination by a significant volume of another fluid, typically water or fuel oil. A systematic approach is required for positive identification. **1. Initial Onboard Assessment & Sensory Checks:** * **Visual Inspection:** Draw a representative sample from the sump sampling cock. Observe its appearance. A milky, opaque, or emulsified appearance is a strong indicator of water contamination. A noticeable decrease in viscosity (oil appears thinner) and a strong smell of diesel fuel indicate fuel contamination.
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