Genuine OEM Jaguar Engine Chain Tensioner, part number C2Z28428. This critical component applies constant pressure to the engine's timing or drive chain, preventing slack and ensuring precise valve timing. It is located within the engine assembly, often near the timing chain. Constructed from durable cast metal, it is designed for long-term reliability. Choosing a genuine OEM tensioner ensures correct spring tension and hydraulic damping for optimal engine performance and longevity.