Class 4 (4th Engineer) MEKM 📅 Apr 2023

Exam Question

Explain how leakage of the undermentioned valves may become apparent to watchkeepers and state the effects on engine operation. Describe the immediate and subsequent action which might be necessary in each case:

(a) Exhaust valve (6)

(b) Fuel valve (5)

Reference Answer

### (a) Exhaust Valve (6 Marks)
#### How Leakage Becomes Apparent
A watchkeeper can identify a leaking exhaust valve through the following key indicators:
* **Increased Exhaust Temperature:** This is the primary and most immediate indication. The exhaust gas temperature of the affected cylinder will be significantly higher than the others and the engine's baseline readings. This is caused by high-pressure, high-temperature gas passing the valve during the power stroke, a process known as "blow-by" or "guttering".

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