One experiences evidence of high temperature...

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Question 1 of 2066636eef28f7522a1c51fff9

One experiences evidence of high temperature corrosion on diesel engine combustion space components. This is exhibited by 'wire drawing' marks on exhaust valves/seats or metal reduction on cylinder heads. What causes this degradation of components?

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Question 1 of 20

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🔍 Key Concepts

• High temperature corrosion mechanisms in diesel engine exhaust components • The role of fuel impurities (like vanadium, sodium, sulfur) in forming corrosive deposits at high temperatures • The difference between damage from overheating/thermal stress and damage from corrosive ash deposits

💭 Think About

• Think about what specifically is meant by high temperature corrosion and how it differs from simple overheating or burning of metal. • Which of the listed options is most directly associated with forming corrosive compounds or ash that attack hot metal surfaces in the exhaust area? • Consider where exhaust valves and seats are located in the engine cycle—what passes over them, and what in that stream could chemically attack them at high temperature?

✅ Before You Answer

• Verify which option directly involves chemical attack from combustion products, not just high temperature alone. • Check which factor is known in marine diesel practice to form low-melting-point salts/ash that can erode or corrode exhaust valves. • Confirm that the chosen cause would affect exhaust-side components in particular, where hot gases and fuel ash are present.

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