USCG Exam PracticeDiesel engine principles (motor propulsion)
A watchstander notices that one cylinder's exhaust temperature is significantly higher than all other cylinders at the same load. Which condition is most consistent with this indication?
- 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 flow to the jacket-water cooler
- D. Excessive ignition delay causing diesel knock across multiple cylinders
Why B is correct
NAVEDTRA 14075 §3-1 states that a cylinder running hotter or colder on exhaust than its neighbors points to an injector fault, an intake or exhaust problem, or uneven load sharing. Low compression would more likely show as a cold cylinder, and a fouled strainer would affect overall engine temperature rather than a single cylinder.
Cited:NAVEDTRA 14075 §3-1