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Class 2 (2nd Engineer) MEKG 📅 Sep 2025

Exam Question

(a) Explain how analysis of used lubricating oil can be used as a "health-monitoring" tool for diesel engines.

(b) Describe how vibration measurement can be used with a main engine turbocharger:

(i) For fault analysis.

(ii) For condition monitoring with respect to maintenance.

(iii) As a substitute to opening machinery for survey.

Reference Answer

### (a) Lubricating Oil Analysis as a "Health-Monitoring" Tool for Diesel Engines
Lubricating oil analysis is a cornerstone of predictive and condition-based maintenance for marine diesel engines. By analyzing a representative sample of used lubricating oil, engineers can gain critical insights into both the condition of the oil itself and the health of the internal engine components from which the oil circulates. It functions as a non-invasive diagnostic tool, akin to a blood test for the engine.
**1. Analysis of Oil Condition (Is the oil fit for continued use?):**
This aspect evaluates the oil's remaining useful life and its ability to perform its functions of lubrication, cooling, cleaning, and corrosion prevention.

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