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Class 4 (4th Engineer) MEKM 📅 Apr 2025

Exam Question

For 2-Stroke Marine Diesel Engine

(a) Describe problems in achieving good lubrication of Cylinder Liner. (6) 

(b) What are the properties of good cylinder oil? (4) 

(c) What are the consequences of under and over lubrication of liner? (6) 

Reference Answer

### (a) Problems in Achieving Good Lubrication of Cylinder Liner (6 Marks)
Achieving an effective, persistent lubricating oil film on a 2-stroke engine cylinder liner is a significant engineering challenge due to a combination of extreme operating conditions and conflicting requirements.
1. **Extreme Thermal Loading**: The liner surface temperature can exceed 250°C in the upper parts during combustion. This high temperature can cause the lubricating oil to:
* **Evaporate**: Reducing the amount of oil available on the liner wall.

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