Class 4 (4th Engineer) MEP 📅 Dec 2023

Exam Question

During your watch you observe that Main Engine L.O. sump level is rising due to contamination of lubricating oil. Describe the procedure to:

(a) Identify the contaminant. (6)

(b) Locate the cause of contamination (6)

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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