Exam Question
Why it is preferred to have timed cylinder lubrication in a slow speed two stroke engine and how is it achieved highlighting the development by two major makers (16)
Class 4 (4th Engineer)
MEKM
📅 Jul 2022
Reference Answer
### Introduction to Cylinder Lubrication
Cylinder lubrication in large, slow-speed, two-stroke marine diesel engines is critical for ensuring engine reliability, efficiency, and longevity. Its primary functions are:
1. **Reduce Friction & Wear:** To create a hydrodynamic oil film between the piston rings and the cylinder liner, minimizing friction and abrasive/adhesive wear.
2. **Neutralize Corrosive Acids:** To neutralize the sulfuric acid (H₂SO₄) formed during the combustion of sulfur-containing heavy fuel oil. This prevents 'cold corrosion'.
Cylinder lubrication in large, slow-speed, two-stroke marine diesel engines is critical for ensuring engine reliability, efficiency, and longevity. Its primary functions are:
1. **Reduce Friction & Wear:** To create a hydrodynamic oil film between the piston rings and the cylinder liner, minimizing friction and abrasive/adhesive wear.
2. **Neutralize Corrosive Acids:** To neutralize the sulfuric acid (H₂SO₄) formed during the combustion of sulfur-containing heavy fuel oil. This prevents 'cold corrosion'.
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