The diesel engine shown in the illustration,...

Question 1 of 2707066636eef28f7522a1c51f9ac

The diesel engine shown in the illustration, which of the lettered parts listed is cooled by sea water? Illustration MO-0003

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Question 1 of 27070

The diesel engine shown in the illustration, which of the lettered parts listed is cooled by sea water? Illustration MO-0003

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🔍 Key Concepts

• Typical sea water cooling circuit on a marine diesel (what it usually cools directly vs indirectly) • Difference between jacket water cooling (fresh water) and sea water cooling in engine diagrams • Look at where piping connections to the ship’s sea chest or overboard discharge would logically be located

💭 Think About

• For each labeled part (P, Q, W, Y), ask yourself: is this a component that can safely handle corrosive sea water, or is it something that is usually protected by fresh water? • Trace in the illustration which parts look like heat exchangers or coolers and which are clearly internal engine parts like pistons, liners, or bearings. • Consider which components must be kept very clean and at stable temperature (likely cooled by jacket water or lube oil) versus those that can tolerate rougher, less controlled sea water cooling.

✅ Before You Answer

• Verify which letter points to a separate cooler/heat-exchanger body rather than the cylinder liner, piston, or crankcase. • Confirm that the part you pick would normally be on the sea water side of a two‑circuit cooling system (sea water cooling the fresh water or lube oil, not the metal of the piston or liner directly). • Double‑check that the part you choose is outside the main combustion/working spaces and connected by external piping that could reasonably be sea water inlets or outlets.