Oilers/Plant Tenders (HHC) Civil Service Practice Exam

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What is a potential consequence of excessive lubrication in diesel cylinders?

Fuel leakage
Carbon deposits
Oil pressure drop
Increased engine temperature

The correct answer is: Carbon deposits

Excessive lubrication in diesel cylinders can lead to the formation of carbon deposits. When too much oil is introduced into the cylinders, it may not combust completely during the combustion process. The unburned oil then accumulates and forms carbon residues on engine components such as pistons and cylinder walls. This buildup of carbon can adversely affect engine performance by impacting compression, leading to knocking or misfiring, and may necessitate additional maintenance or cleaning procedures. This outcome emphasizes the importance of maintaining the correct oil levels and the appropriate lubricating properties in diesel engines, as an overabundance can disrupt the ideal combustion process.