🔍 Key Concepts

• Basic diesel engine parts: piston, connecting rod, crankshaft, camshaft, rocker arm • Reciprocating vs. rotating motion: which parts move up-and-down vs. round-and-round • Location and job of the connecting rod inside the cylinder assembly

💭 Think About

• Think about which two parts of the engine must be linked so that the up‑and‑down motion in the cylinder can turn into rotary motion at the shaft • Ask yourself: which of these choices are actually connected by other parts (like gears, cams, or pushrods) instead of by the connecting rod? • Visualize a simple single‑cylinder engine: follow the motion from the piston crown all the way to the output shaft—where does the connecting rod sit in that chain?

✅ Before You Answer

• Identify which listed parts move reciprocally (back and forth) and which move rotationally • Eliminate any option that describes parts normally linked by gears, cam lobes, or pushrods, rather than by a connecting rod • Make sure your final pair of components is located inside or directly attached to the cylinder/ crankcase assembly, not out on the external gearing