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Class 4 (4th Engineer) MEKG 📅 Jul 2023

Exam Question

(a) What are the type of contaminants which affect lubricating oils? Briefly explain each of them. (6)

(b) What measures are adopted to prevent their entry into machinery lubricating oil systems? (4)

(c) How contaminated oils are dealt with on ships? Particularly in the case of bacterial attack (6)

Reference Answer

### (a) Types of Contaminants Affecting Lubricating Oils
Lubricating oil in a marine engine system is susceptible to various forms of contamination which degrade its properties and can lead to catastrophic machinery failure. The primary types are:
1. **Water Contamination:**
* **Sources:** Leaks from machinery cooling systems such as cylinder liner/jacket cooling water, piston cooling water systems, and lubricating oil coolers. Other sources include leaks from sump tank heating coils and condensation from the atmosphere within the crankcase, especially in humid conditions or during large temperature fluctuations.

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