Exam Question

(a) Causes and Detection of Cylinder Liner Wear
There are three primary causes of cylinder liner wear: friction , corrosion , and abrasion .
Frictional Wear : This type of wear happens due to the sliding contact between the piston rings and the cylinder liner surface. It's influenced by the materials used, surface finish, lubrication, and engine operating parameters like speed and load.
Corrosion Wear : This is a major cause of wear, especially in engines running on heavy fuel oil (HFO) with high sulfur content. During combustion, sulfur forms acidic compounds. If the lubricating oil fails to neutralize these acids, they react with the cylinder liner, causing corrosive wear. This is particularly prevalent in the lower part of the liner where temperatures drop and acid condensation (dew point) occurs.