When changing over from residual to distillate fuel on a slow-speed diesel propelled vessel, you should limit the rate of temperature change of the fuel in order to prevent what operational difficulty?
• Fuel system components with very close clearances such as fuel pump plungers and injector needles • Effects of rapid temperature changes (thermal shock/expansion) on metal parts • What actually changes when you go from residual (heavy) fuel to distillate fuel (viscosity, temperature, lubrication)
• Which parts of the fuel system are most sensitive to temperature and viscosity changes during fuel changeover? • Would a rapid change in fuel temperature be more likely to damage heaters and tanks, or precision moving parts in the injection system? Why? • How could a quick drop in fuel temperature affect lubrication and clearances between sliding components?
• Identify which options involve precision sliding components with very tight clearances. • Ask yourself where poor lubrication or sudden thermal contraction/expansion would cause immediate mechanical trouble. • Verify which problems (carbonization, dezincification, governor surging) are more related to long-term conditions or other causes, not just rapid temperature change during changeover.
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