Class 2 (2nd Engineer) MEP 📅 Apr 2025

Exam Question

(a) Sketch and describe the construction and working principle of an air starting valve used in a two-stroke main engine. (10)

(b) Discuss common faults associated with air starting valves, their possible consequences, and maintenance or safety measures taken to ensure reliable operation. (6)

Reference Answer

### (a) Construction and Working Principle of an Air Starting Valve
#### Construction
The air starting valve is a critical component mounted on the cylinder head of each unit of a large two-stroke marine diesel engine. Its primary function is to admit a timed, high-pressure blast of air to push the piston down and initiate engine rotation. Its construction is robust to withstand high pressures and temperatures.
**Key Components:**

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