🔍 Key Concepts

• cold starting of diesel engines and how temperature affects ignition • relationship between cranking speed, compression temperature, and ignition of fuel • which problems are likely to cause chronic issues versus only in cold conditions

💭 Think About

• Which of these problems would become noticeably worse only when the engine and air are very cold, but might be less of a problem when everything is warm? • How does cranking speed affect the air temperature at the end of compression in a diesel cylinder, especially in cold weather? • Which options would cause starting problems in all temperatures, not just in low ambient temperature conditions?

✅ Before You Answer

• Focus on the choice that directly affects compression temperature during starting, especially in cold air. • Eliminate any options that would cause constant poor performance, not just hard starting in cold conditions. • Think about what a diesel engine most needs at the moment of start: adequate compression and high enough air temperature for fuel to ignite.