Class 2 (2nd Engineer) MEKG 📅 Apr 2023

Exam Question

(a) State why the temperature of lubricating oil supplied to an engine needs close control.

(b) Sketch and describe an arrangement and explain the principle of operation of instrumentation and control equipment for automatically maintaining the temperature of lubricating oil supplied to an engine at its desired value

Reference Answer

### (a) Reasons for Close Control of Lubricating Oil Temperature
Close control of lubricating oil (LO) temperature supplied to a marine diesel engine is critical for ensuring engine reliability, efficiency, and longevity. The primary reasons are rooted in the physical and chemical properties of the oil and its interaction with engine components.
1. **Viscosity Maintenance:**
* **Principle:** Lubricating oil viscosity is inversely proportional to its temperature. The primary function of the oil is to maintain a hydrodynamic film between moving parts (e.g., journal and bearing) to prevent metal-to-metal contact.

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