Class 4 (4th Engineer) MEKM 📅 Aug 2022

Exam Question

Compare the desirable qualities of the lubricating oil selected for each of the following duties:

(a) Auxiliary diesel engines. (4)

(b) Stern tube bearings. (4)

(d) Gear case of purifier (4)

Give reasons for the differing properties of the oils recommended for these four purposes.

Reference Answer

### Introduction
The selection of a lubricating oil is a critical engineering decision tailored to the specific demands of the machinery. Each application presents a unique combination of operating pressures, temperatures, speeds, potential contaminants, and materials. Therefore, oils are formulated with a specific base stock and an additive package designed to optimize performance and longevity for that particular duty. The fundamental differences arise from the primary challenges the lubricant must overcome in each environment.
### (a) Auxiliary Diesel Engines
Auxiliary engine oils, typically for trunk piston engines, operate in a severe environment contaminated by the by-products of combustion.

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