Engineering · Diesel — Cooling
In a typical marine diesel jacket-water cooling system, the jacket water is cooled by:
- ADirect seawater flooding the cylinder jackets
- BSeawater passing through a heat exchanger (the jacket water stays in a closed loop)✓ Correct
- CAir drawn over the block
- DThe lube oil cooler only
Explanation
Treated fresh jacket water circulates in a closed loop and gives up heat to seawater through a heat exchanger. Keeping seawater out of the jackets prevents scale and corrosion.
Authority: Diesel Engines (USCG engineering topic)
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