To successfully reduce an excessively high diesel engine exhaust gas temperature, you should __________.
β’ Diesel engine combustion and exhaust temperature β what makes exhaust gas temperature go up or down β’ Engine load vs. temperature β how does reducing the load change exhaust temperature? β’ Effects of fuel quantity and timing on power, efficiency, and heat
β’ Think about what happens to exhaust gas temperature when an engine is overloaded and working too hard. What operating change brings it back into a safe range fastest? β’ Which options would add more fuel or heat to the cylinders, and which would reduce the amount of heat energy being released? β’ How does changing fuel timing compare to simply changing how hard the engine is being worked?
β’ Identify which choice directly reduces the work or torque demand on the engine. β’ Eliminate any option that would increase fuel delivery or tend to increase cylinder pressure and temperature. β’ Consider which action is normally recommended in operating manuals when you see high exhaust gas temperature alarms.
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