🔍 Key Concepts

• High viscosity fuel behavior at low vs. high temperature • Requirements for starting a large, low-speed diesel after a long shutdown • Difference between fuel heating, intake air heating, and lube oil temperature adjustments

💭 Think About

• What happens to high viscosity fuel inside pipes, pumps, and injectors if it is cold and the engine has been shut down for a long time? • Which of the listed actions will most directly help the fuel reach and pass through the injection system properly during starting? • Which options are more related to combustion efficiency after running, rather than to overcoming fuel flow problems at start-up?

✅ Before You Answer

• Verify which system is most affected by fuel viscosity: fuel system, air system, or lube oil system • Consider standard shipboard practice for operating heavy fuel oil (HFO) or other high viscosity fuels in large slow-speed diesels • Check which option is a common procedural step in engine start-up checklists for engines burning heavy fuel oil