If the diesel engine starter-drive mechanism...

🔍 Key Concepts

• Starter drive (Bendix drive) operation – what is supposed to happen to the starter gear right after the engine fires? • Relative speeds – compare normal starter-motor RPM to the RPM of the engine/flywheel once it is running on its own. • Mechanical vs electrical effects – think about whether the first problem would be to the engine, the electrical system, or the starter itself.

💭 Think About

• Once the engine is running under its own power, which part is turning faster: the starter motor or the engine flywheel? What happens if they stay mechanically engaged? • Would the first logical result be that the engine suddenly stops, that current reverses direction, or that one rotating part starts being driven much faster than it was designed for? • In a real engine room, which component would you be most worried about damaging immediately if the starter pinion stayed meshed with the flywheel ring gear?

✅ Before You Answer

• Verify what the starter drive mechanism is designed to do as soon as the engine fires (disengage to prevent damage). • Consider which option describes the most direct and immediate consequence to the starter assembly if it remains engaged with a running engine. • Check whether any option implies a condition (reverse current, engine stall) that is less likely than mechanical overspeeding or damage when two gears remain meshed.

If the diesel engine starter-drive mechanism fails to disengage after the engine starts, which of the following situations will occur?

The engine will stall.

The starter motor will have reverse current.

The engine flywheel will be burred.

The starter motor will over speed.

🔍 Key Concepts

💭 Think About

✅ Before You Answer