🔍 Key Concepts

• How diesel engines ignite fuel (compression vs. spark) • Common causes of rough running in internal combustion engines • Which systems (fuel, lube, cooling, ignition) directly affect how smoothly combustion occurs

💭 Think About

• Ask yourself which listed system is essential for starting and controlling combustion in a diesel engine • Consider which systems, when they fail, usually cause stoppage or overheating rather than just rough operation • Think about how a diesel differs from a gasoline engine in terms of ignition source

✅ Before You Answer

• Verify which system a diesel engine does NOT normally have among the choices • Identify which system most directly affects fuel atomization and delivery to the cylinders • Confirm which systems mainly protect the engine (temperature, friction) rather than determine how smoothly it fires each cycle