Diesel engine closed, recirculating cooling...

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Question 1 of 2066636eef28f7522a1c51f946

Diesel engine closed, recirculating cooling water systems are particularly prone to cavitation corrosion/erosion. Which of the listed cooling system/engine components has surfaces in contact with the coolant that are most susceptible to this type of corrosion and erosion?

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Question 1 of 20

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🔍 Key Concepts

• Cavitation occurs where there are rapid pressure changes in the coolant flow, especially at high velocities and sharp changes in direction. • Think about which component has the thinnest metal walls directly exposed to coolant on one side and combustion or gas pressure on the other. • Closed, recirculating fresh-water cooling systems often show pitting where bubbles form and collapse repeatedly on the same surface.

💭 Think About

• Which of these four locations is most likely to experience the highest coolant velocity and most turbulent flow right against a relatively thin metal surface? • Where would pressure fluctuations from combustion and piston movement be transmitted most directly through the metal into the coolant space? • If cavitation causes pitting that can eventually lead to perforation/leaks, which component on the list would be most critical and vulnerable to that kind of damage?

✅ Before You Answer

• Identify which component has direct coolant contact with the cylinder bore surface and is relatively thin compared to the block or head casting. • Consider where coolant flow changes direction sharply or accelerates, increasing the risk of vapor bubble formation and collapse. • Eliminate options where the metal is heavy, thick castings with more stable pressure conditions on the coolant side.

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