Class 2 (2nd Engineer) MEKM 📅 Apr 2025

Exam Question

Express your reactions and state the subsequent investigation you would make if a laboratory report on a used diesel engine oil sample indicated the presence of appreciable amounts of:

(a) Iron;

(b) Copper;

(d) Silicon;

(e) n-pentane and toluene insoluble.

Reference Answer

The laboratory report reveals the presence of appreciable quantities of many elements and insoluble materials in the used diesel engine oil sample, indicating potential wear and contamination issues within the engine. The following observations and subsequent investigations are warranted:
(a) Iron:
The presence of iron in the oil sample strongly suggests excessive wear of ferrous components within the engine. This is likely due to abrasion and/or corrosion. The following components require immediate and thorough inspection: cylinder liners, piston rings, camshaft, crankshaft, gears, pumps, and all other iron components. Particular attention should be paid to the surface finish and wear patterns of these parts. The lubrication system's effectiveness will also be assessed to ensure adequate oil delivery and pressure to these components.
(b) Copper:

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