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?

Correct Answer: Option A — Seizing and scuffing of fuel pump plungers and injector needle valves due to thermal effects on close clearance components.

Under USCG National Maritime Center examination standards, the accepted correct answer is: Seizing and scuffing of fuel pump plungers and injector needle valves due to thermal effects on close clearance components..