Engineering · Diesel — Cooling
A thermostatic (three-way) valve in the jacket-water circuit functions to:
- ADump all water overboard when hot
- BRegulate engine temperature by bypassing or routing water through the cooler✓ Correct
- CIncrease seawater flow at idle
- DRelieve crankcase pressure
Explanation
The thermostatic valve maintains a stable engine temperature by proportioning flow between the cooler and a bypass — sending water through the cooler only as the engine heats up.
Authority: Diesel Engines (USCG engineering topic)
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