Question 2Motor Plants - 1st Asst/Chief
70% to passDuring main engine performance testing it is noticed that one cylinder has firing and compression pressures lower than average. Which of the following would most likely be the cause?
AEarly fuel injection
BLow engine load
CWorn piston rings
DLate fuel injection
AI Explanation
The correct answer is C) Worn piston rings. When one cylinder has lower firing and compression pressures compared to the others, the most likely cause is worn piston rings. Worn piston rings allow compression and combustion gases to leak past the piston, resulting in lower pressures in that cylinder. This is because the piston rings play a critical role in sealing the combustion chamber and maintaining proper compression and combustion pressures. The other options are incorrect because early or late fuel injection would affect all cylinders equally, and low engine load would not cause uneven cylinder performance.
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