USCG Exam PracticeMaintenance, machine tools, drawings, and tables
When monitoring a diesel engine's condition, which parameter most directly indicates leakage past worn piston rings or a poorly seating valve?
- A. Elevated exhaust temperature on one cylinder
- ✓ Low compression pressure on a cylinderCorrect
- C. Increased turbocharger speed
- D. Rising jacket-water temperature
Why B is correct
NAVEDTRA 14075 §3-1 states that compression pressure that is low on a cylinder points to leakage past worn rings, a burned or poorly seating valve, or a scored liner. Elevated exhaust temperature on one cylinder points to an injector fault or uneven load sharing, not ring or valve leakage.
Cited:NAVEDTRA 14075 §3-1