🔍 Key Concepts

• what creates compression inside a diesel cylinder • the difference between air compression problems and fuel system problems • parts that must seal properly between the piston, rings, liner, and cylinder head

💭 Think About

• Ask yourself: which options deal with keeping air sealed inside the cylinder during the compression stroke? • Which choices affect temperature or fuel delivery, but do NOT actually change the cylinder’s ability to build compression pressure? • Think about where leaks of air could occur as the piston comes up in the cylinder.

✅ Before You Answer

• Identify which choices involve sealing surfaces in the combustion space (head, gasket, liner, piston rings). • Eliminate any options that mainly affect cooling or fuel delivery rather than air compression. • Focus on which defects would let air escape from the cylinder when the piston is moving upward.