USCG Exam PracticeLube oil and fuel oil systems
In a typical marine diesel wet-sump lubrication system, what is the correct sequence of oil flow from the sump to the engine bearings?
- A. Sump → full-flow filter → gear pump → oil cooler → bearings
- ✓ Sump → suction strainer → gear pump → full-flow filter → oil cooler → bearingsCorrect
- C. Sump → gear pump → suction strainer → oil cooler → full-flow filter → bearings
- D. Sump → oil cooler → suction strainer → gear pump → full-flow filter → bearings
Why B is correct
NAVEDTRA 14075 §3-3 describes the sequence as: gear pump draws oil from the sump through a suction strainer, then delivers it under pressure through a full-flow filter and a lube-oil cooler to the bearings. The strainer is on the suction side before the pump, and the filter precedes the cooler.
Cited:NAVEDTRA 14075 §3-3