Class 2 (2nd Engineer) MEKM 📅 Feb 2021

Exam Question

(a) A number of main engine cylinder cover have been subject to cracking during the preceding four months

(i) Explain possible reasons for this cracking.

(ii) State with reasons the action you, as Second Engineer, would take in order to reduce the possibility of future cylinder cover cracking.

(b) Cylinder liner wear has increased appreciably during the past six months. Write a brief report to the engineering superintendent concerning this matter explaining the possible causes, the immediate action taken to deal with the problem and the action you, as Second Engineer, intend to take in order to reduce the risk of future incidents.

Reference Answer

(a) (i) Possible reasons for this cracking:
This can result from overloading the engine, incorrect fuel injection timing (including issues with the Variable Injection Timing – VIT system), or improper fuel injection quantity. The resulting high pressure stresses the cylinder cover material beyond its elastic limit, leading to cracking.
Scale formation or deposits in the cooling passages can restrict water flow, causing inadequate cooling and leading to overheating and thermal stress on the cylinder cover.
Incorrect tightening of cylinder head bolts can lead to uneven stress distribution. Excessive tightening may induce mechanical stress, while insufficient tightening can cause leakage and localized overheating.

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