Genuine OEM Nissan Timing Gear for Injection Pump, part number 1680300QAA. This gear is a crucial component that meshes with other timing components to drive the fuel injection pump at the correct speed and timing relative to the engine's crankshaft. Precise timing is essential for optimal fuel delivery, engine performance, and emissions control. Manufactured from high-strength, hardened steel to withstand the high loads and wear associated with engine operation. Genuine OEM parts ensure the correct tooth profile and material hardness for reliable and accurate fuel injection.