Immediately after starting a diesel engine, normal raw water and jacket water pressures are indicated. However, the jacket water temperature continues to rise. If there is no change in the sea temperature, you should suspect __________.
• Relationship between cooling water temperature, pressure, and flow in a diesel engine • Function of a three-way thermostatic valve in controlling jacket water temperature • Difference between a cooling system flow problem and a load/combustion problem
• If water pressures are normal but temperature keeps rising, what does that suggest about flow vs. direction of flow? • Which component in the cooling system is responsible for routing water either through or around the cooler as temperature changes? • Which of the choices would cause a rapid temperature rise right after start, without any change in sea water conditions or engine loading?
• Verify which option directly affects how jacket water is routed through the cooler or bypass, not just overall system pressure. • Check which condition would show normal pressures yet still prevent effective cooling of the jacket water. • Eliminate options that mainly relate to chemical treatment or tank level rather than immediate temperature control right after starting.
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