Which of the following conditions is most...

Question 1 / 270705eccefa2bacbc34ba4d47910

Question 1 of 270705eccefa2bacbc34ba4d47910

Which of the following conditions is most likely to occur when unburned fuel contaminates the crankcase of a diesel engine?

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Question 1 of 27070

Which of the following conditions is most likely to occur when unburned fuel contaminates the crankcase of a diesel engine?

🔍 Key Concepts

• Effect of fuel dilution on lube oil properties in a diesel engine • Relationship between viscosity and lubrication quality in bearings • Where unburned fuel is likely to travel and what parts it contacts first

💭 Think About

• Think about what happens to the crankcase oil if liquid fuel leaks past the piston rings and mixes with it. How would that change the oil’s thickness and protective film? • Which of the listed problems would logically happen first when fuel gets into the crankcase: a chemical reaction forming acid, mechanical failure of bearings, or a change in the oil itself? • Which choice describes a condition that is gradual and common, rather than sudden and catastrophic?

✅ Before You Answer

• Which option directly mentions lubricating oil properties rather than later consequences? • Consider what must usually happen before bearings fail or valves sludge up—does the oil itself change first? • Ask yourself which effect would be most immediate and predictable when fuel mixes with oil in the crankcase.

Question 1 of 27070

Which of the following conditions is most likely to occur when unburned fuel contaminates the crankcase of a diesel engine?

Lube oil is diluted and its viscosity is reduced.

Sulfuric acid is formed.

Bearings become pitted and immediately fail.

Valve stems develop sludge deposits.

Question 1 / 270705eccefa2bacbc34ba4d47910

Question 1 of 270705eccefa2bacbc34ba4d47910

Which of the following conditions is most likely to occur when unburned fuel contaminates the crankcase of a diesel engine?

Back

Question 1 of 27070

Which of the following conditions is most likely to occur when unburned fuel contaminates the crankcase of a diesel engine?