Genuine OEM Citroen Crankshaft Main Bearing Half Shell, part number 9806570980. This critical engine component is designed to provide a low-friction surface for the crankshaft to rotate on, supporting its weight and absorbing combustion forces. It is positioned between the crankshaft and the engine block or main bearing cap, forming a complete bearing when paired with another half shell. This specific half bearing is within the 1.839 to 1.844 tolerance range. Weighing approximately 0.021 kg, it is manufactured to extremely tight tolerances for optimal oil film formation and minimal wear. Choosing genuine OEM ensures the correct material composition, precise dimensions, and factory-specified clearances for reliable engine operation and extended service life.