If an auxiliary diesel engine will not crank...

🔍 Key Concepts

• What it means when a diesel engine can be "barred over" by hand but will not crank on the starter • How electrical starting systems (batteries, cables, starter motor) differ from mechanical or load-related problems • Which problems would physically prevent the engine from turning over at all

💭 Think About

• If you can rotate the engine by hand, what does that tell you about the condition of the cylinders and anything mechanically connected to the crankshaft? • Which of the listed problems would stop the engine from turning even by hand, and which would only affect powered cranking? • Which choice relates to the source of power for the starter, rather than a mechanical blockage or external system?

✅ Before You Answer

• Confirm that being able to bar the engine over means the crankshaft and driven equipment are free to turn mechanically • Eliminate any options that would cause a hard mechanical lock preventing hand rotation • Focus on the choice that affects electrical starting power rather than cooling water or sea connections

If an auxiliary diesel engine will not crank but can be barred over, the trouble may be __________.

starting batteries

water in the cylinder

the driven component is seized

sea suction valve is closed