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Class 2 (2nd Engineer) MEP 📅 Nov 2023

Exam Question

Severe engine vibration has recently become evident when the main engine for which you are responsible operates within a certain speed range

(a) State, with reasons, the possible causes of such vibration. (5)

(b) State the consequences of operating the engine under such vibratory conditions. (5)

(c) Describe the procedure you, as Second Engineer, would implement in order to investigate and rectify the problem. (6)

Reference Answer

(a) Severe engine vibration within a specific speed range can be caused by either internal or external factors.
Internal Troubles:
Improper fuel injection timing, misfire, or power imbalance between cylinders can cause uneven combustion forces leading to vibrations.
Problems with the fuel pump, fuel injectors, or fuel lines can disrupt fuel delivery, resulting in inconsistent combustion and vibration.

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