Exam Question
(a) List and explain the desirable properties of lubricating oil for different application such as for main engine, auxiliary engine and for cylinder lubrication. (8)
(b) Sketch an auxiliary engine lubricating oil circuit. (8)
Class 4 (4th Engineer)
MEKM
📅 Feb 2026
Reference Answer
### Part (a): Desirable Properties of Lubricating Oil
A lubricating oil's primary functions are to reduce friction, remove heat, prevent corrosion, and keep engine components clean. The specific formulation and properties must be tailored to the unique operating environment of each application.
#### 1. Main Engine Cylinder Oil (Crosshead Engines)
This is a 'total loss' system where oil is injected directly into the cylinder for a single use before being combusted. The environment is extremely harsh due to high temperatures, pressures, and direct exposure to combustion products from high-sulfur fuel.
A lubricating oil's primary functions are to reduce friction, remove heat, prevent corrosion, and keep engine components clean. The specific formulation and properties must be tailored to the unique operating environment of each application.
#### 1. Main Engine Cylinder Oil (Crosshead Engines)
This is a 'total loss' system where oil is injected directly into the cylinder for a single use before being combusted. The environment is extremely harsh due to high temperatures, pressures, and direct exposure to combustion products from high-sulfur fuel.
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