Class 4 (4th Engineer) MEKM 📅 Mar 2026

Exam Question

With reference to cylinder liner wear in large slow speed engine.

(a) State THREE major factors associated with wear. (4)

(b) Explain the procedure for correct 'running in' of piston rings and cylinder liners. (4)

(d) Describe how cylinder lubrication limits wear. (4)

Reference Answer

### (a) State THREE major factors associated with wear.
Three principal factors contributing to cylinder liner wear in large slow-speed diesel engines are Corrosive, Abrasive, and Adhesive wear.
1. **Corrosive Wear (Cold Corrosion):** This is the most significant contributor to liner wear when operating on residual fuels.
* **Mechanism:** High-sulfur fuel oil (HSFO) combustion produces sulfur oxides (SOx). When these gases come into contact with water vapour (a product of combustion), they form sulfurous and sulfuric acids.

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