đ Key Concepts
⢠starting requirements for a diesel engine (air, fuel, compression, speed)
⢠the relationship between cranking speed and compression/ignition
⢠what conditions are typically âtoo lowâ or âtoo highâ to prevent proper combustion
đ Think About
⢠Which of these choices would directly prevent the cylinder from reaching the temperature and pressure needed for diesel fuel to ignite?
⢠Think about normal operating ranges: which options actually improve engine operation if within limits, and which, when inadequate, stop it from starting at all?
⢠On a dead-cold engine, before it runs on its own, what single factor related to the starter and batteries is critical so that compression ignition can occur?
â
Before You Answer
⢠Identify which factor is absolutely necessary during the starting phase but is provided by the starter system, not by the running engine itself.
⢠Eliminate any options that describe a condition that would more likely affect efficiency after the engine is running, not the initial start.
⢠Ask: Which option, if not sufficient, means the engine simply cannot fire, no matter how much fuel you have?