Exam Question
With specific to reference to any make, sketch and describe the Cylinder Lubricating System used in new generation marine diesel engines. How will you effect the optimum cylinder oil feed with varying sulphur content of fuel oil. (16)
Class 1 (Chief Engineer)
Engineering Management
📅 Feb 2024
Reference Answer
### **1. Introduction to Modern Cylinder Lubrication**
New generation marine two-stroke crosshead diesel engines require precise and efficient cylinder lubrication to handle high thermal and mechanical stresses, optimize operating costs, and comply with environmental regulations. Unlike older mechanical, revolution-dependent systems, modern systems are electronically controlled, load-dependent, and timed. Their primary objectives are:
* **Lubrication:** To create a hydrodynamic film between the piston rings and cylinder liner, minimizing frictional (abrasive) wear.
* **Neutralization:** To neutralize corrosive sulfuric acid (H₂SO₄) formed during the combustion of sulfur-containing fuels, thereby preventing cold corrosion.
New generation marine two-stroke crosshead diesel engines require precise and efficient cylinder lubrication to handle high thermal and mechanical stresses, optimize operating costs, and comply with environmental regulations. Unlike older mechanical, revolution-dependent systems, modern systems are electronically controlled, load-dependent, and timed. Their primary objectives are:
* **Lubrication:** To create a hydrodynamic film between the piston rings and cylinder liner, minimizing frictional (abrasive) wear.
* **Neutralization:** To neutralize corrosive sulfuric acid (H₂SO₄) formed during the combustion of sulfur-containing fuels, thereby preventing cold corrosion.
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