Class 2 (2nd Engineer) MEP 📅 Dec 2023

Exam Question

(a) During an inspection it is noticed that tie rods of certain main engine units have become slack, state with reasons the possible causes of this. (6)

(b) Explain how correct tension is restored and the risk of future slackness minimized. (5)

(c) A tie rod has fractured and cannot be replaced immediately, State with reasons the course of action to be adopted in order to allow the engine to be operated without further damage. (5)

Reference Answer

(a) Possible Causes of Slack Tie Rods:
Over time, the high-tensile steel tie rod can experience creep, a time-dependent deformation under sustained load. This gradual elongation reduces the initial tension.
Repeated cycles of gas pressure and engine vibration can induce fatigue in the tie rod material. Microscopic cracks can develop, leading to a reduction in effective length and consequently, preload loss.
Incorrect tightening during installation or maintenance can result in insufficient initial tension. This is often the root cause of premature slackness.

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