Exam Question

### (a) Circumstances Under Which a Two-Stroke Engine Fails to Turn on Air (8 Marks)
A two-stroke marine diesel engine may fail to turn on starting air due to a combination of issues related to the air supply, control systems, or the mechanical condition of the engine itself. A comprehensive diagnosis requires a systematic evaluation of the entire starting sequence.
1. **Insufficient Starting Air Pressure or Flow:**
* **Low Receiver Pressure:** The pressure in the starting air receivers is below the minimum required by the engine manufacturer (typically below 15-20 bar). This can be due to excessive previous starting attempts, a leaking system, or malfunctioning air compressors.