An oil pump gear is a critical component of an internal combustion engine that facilitates the circulation of oil throughout the engine. It is typically located near the crankshaft and connected to the oil pump. The gear ensures that the oil pump operates at the correct speed to provide adequate oil circulation. This is essential for lubricating engine parts, reducing wear, and maintaining engine performance and longevity. Without a properly functioning oil pump gear, an engine could suffer severe damage due to overheating and increased friction.