🔍 Key Concepts

• cavitation in pumps and cooling passages – where low pressure and high velocity water flow can form vapor bubbles • engine components that have a waterside and a gas side – think about what is actually in contact with cooling water • cooling water flow path in a typical medium-speed diesel: pump → cooler → engine block/liners/head, etc.

💭 Think About

• Which of the listed components are actually cooled by water on the inside surface and exposed to combustion or exhaust gas on the other side? • Where in the engine does rapid temperature change and high local flow velocity on the waterside make cavitation damage more likely? • For each option, ask yourself: does cooling water ever directly contact this part, or is it only exposed to fuel or exhaust gas?

✅ Before You Answer

• Eliminate any choices that never see cooling water on any surface. • Focus on parts that form the boundary between hot combustion gases and the cooling water jacket. • Think about where the cooling jacket is located in a diesel engine and which choice best matches that location.