Final answer:
To shut down a runaway diesel engine, you must cut off its air supply, which could involve using the engine's emergency shutdown feature, manually blocking the air intake, or disconnecting and sealing the air intake duct.
Step-by-step explanation:
To shut down a runaway diesel engine, it is necessary to cut off the air supply to the engine because diesel engines can operate on vapors from oil residues in the intake system. A few methods to stop a runaway diesel include:
- Using the engine's emergency shutdown feature or an emergency air intake shutoff valve if equipped.
- Blocking the air intake manually with an object like a board, provided it is safe to approach the engine.
- Disconnecting the air intake duct and sealing it off, though this should only be attempted if you have the necessary expertise and it is safe to do so.
It is crucial to act quickly and with caution. If you are unsure or lack the skills, it is best to seek the help of a professional mechanic or authority. Additionally, it's important to avoid extinguishing a diesel engine by dousing it with water, as this can cause engine damage or personal injury.