USCG Exam PracticeDiesel engine principles (motor propulsion)
During a diesel engine overhaul, a technician measures crank web deflections. What condition do these measurements primarily indicate?
- A. Piston ring wear and liner out-of-roundness
- B. Injection timing advance relative to top dead center
- ✓ Bearing and crankshaft alignment conditionCorrect
- D. Turbocharger bearing clearance and rotor balance
Why C is correct
NAVEDTRA 14075 §3-1 specifies that crank web deflections are taken to check bearing and alignment condition. Changes in deflection across the web indicate that the crankshaft is bending due to bearing wear or misalignment.
Cited:NAVEDTRA 14075 §3-1