Genuine OEM Jaguar Crankshaft Main Bearing (Upper), part number C2Z30446. This precision-engineered half-shell bearing is a critical component that supports the crankshaft within the engine block, allowing for smooth, low-friction rotation. It is positioned as the upper half of a main bearing assembly. Weighing only 0.033 kg, this bearing is manufactured to exact specifications. Using genuine OEM bearings ensures factory tolerances, proper oil film formation, and a long, vibration-free service life, which is vital for engine longevity and performance.