Exam Question

### (a) Problems in Achieving Good Lubrication of Cylinder Liner (6 Marks)
Achieving an effective and consistent lubricating oil film on the cylinder liner of a large 2-stroke marine diesel engine is fraught with challenges due to the extreme operating environment and mechanical design constraints. The primary problems are as follows:
1. **Extreme Operating Conditions**:
* **High Temperatures**: The upper part of the liner is exposed to combustion temperatures exceeding 1500°C, while liner surface temperatures can reach 250-300°C. This extreme heat can cause thermal breakdown (cracking) and oxidation of the lubricating oil, reducing its effectiveness and leading to the formation of carbonaceous deposits.