Question 1Motor Plants - 1st Asst/Chief
70% to passDuring main engine performance testing it is noticed that the firing pressure of one cylinder is higher than the average, but cylinder compression pressure is normal. Which of the following would most likely be the cause?
AEarly fuel injection
BWorn piston rings
CHigh engine load
DLate fuel injection
AI Explanation
The correct answer is A) Early fuel injection. When the firing pressure of one cylinder is higher than the average, but the cylinder compression pressure is normal, it is most likely due to early fuel injection. Early fuel injection causes the fuel to ignite before the piston reaches top dead center, resulting in a higher firing pressure in that cylinder. In contrast, worn piston rings would cause a decrease in compression pressure, and high engine load or late fuel injection would not specifically lead to a higher firing pressure in one cylinder.
Related Questions
Q240:If the operating speed of a diesel engine increases without an apparent change i... Q198:When checking for the presence of sulfite in the feedwater of an auxiliary boile... Q125:According to the illustration, fuel cutoff timing in the cylinder is controlled ... Q82:What could cause the bypass valve in a full-flow lubrication system to open? ... Q185:In the event of a flame failure in an auxiliary water-tube boiler, you must ____...
Ready to test your knowledge?
Take a Motor Plants - 1st Asst/Chief Practice ExamOfficial Resources