Why do most temperature control valves in diesel engine closed freshwater cooling systems vary the flow of jacket water through the cooler instead of through the engine?

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Accepted Answer

Changing the rate of flow in the jackets could cause localized hot spots.

Answer

Emergency hand control would not be possible if water flow through the jackets were controlled.

Answer

Excessive cooling would take place in the heat exchangers at high loads.

Answer

Excessive cavitation erosion would take place in the coolers.

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