Class 4 (4th Engineer) MEP 📅 Aug 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

(a) To identify the contaminant. (6)

(b) Locate the cause of contamination (6)

Reference Answer

### (a) Procedure to Identify the Contaminant (6 Marks)
Upon observing a continuous rise in the Main Engine L.O. Sump level, a systematic investigation must be initiated immediately to identify the nature of the contaminant. This involves a combination of sensory checks, onboard testing, and preparation for detailed analysis.
1. **Initial Sensory & Physical Checks:**
* **Visual Inspection:** Draw a sample from the sump sampling cock. A milky, emulsified, or cloudy appearance is a strong indication of water contamination. A noticeable thinning of the oil and a distinct diesel smell indicates fuel oil contamination.

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