USCG Exam PracticeDiesel engine principles (motor propulsion)
A watchstander notices that one cylinder's exhaust temperature is significantly higher than all others at the same engine load. According to diesel maintenance guidance, which condition is MOST likely indicated?
- A. Low compression pressure caused by worn piston rings on that cylinder
- ✓ An injector fault, intake or exhaust problem, or uneven load sharing on that cylinderCorrect
- C. A fouled seawater strainer reducing cooling flow to that cylinder's jacket
- D. Excessive ignition delay causing fuel accumulation and diesel knock on that cylinder
Why B is correct
A cylinder running hotter on exhaust than its neighbors points to an injector fault, an intake or exhaust problem, or uneven load sharing. Low compression would more typically show as a cold cylinder, and strainer fouling affects the whole engine rather than one cylinder. (NAVEDTRA 14075 §3-1)
Cited:NAVEDTRA 14075 §3-1