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, antimony and tin
(c) Silicon
Class 2 (2nd Engineer)
MEP
📅 Apr 2018
Reference Answer
If a laboratory report on a used diesel engine oil sample indicated appreciable amounts of iron, copper, antimony, tin, or silicon, each finding would raise specific concerns about engine wear, contamination, or system faults.
(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, Antimony, and Tin:
(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, Antimony, and Tin:
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