USCG Exam PracticeDiesel engine principles (motor propulsion)
Before performing any internal maintenance work on a marine diesel engine, which combination of preparatory steps is required?
- A. Stop the engine, drain the lube-oil sump, and open the indicator cocks
- ✓ Stop the engine, cool it down, isolate starting air and fuel, and engage the turning gearCorrect
- C. Stop the engine, isolate the jacket-water system, and lock the throttle in the closed position
- D. Stop the engine, drain the fuel day tank, and remove the cylinder heads
Why B is correct
NAVEDTRA 14075 §3-1 specifies that before any internal work the engine must be stopped, cooled, starting air and fuel isolated, and the turning gear engaged so the engine cannot roll. This sequence protects personnel from inadvertent starting or rotation.
Cited:NAVEDTRA 14075 §3-1