Litens AJ813574 Supercharger Drive Belt Tensioner Assembly

The Litens AJ813574 is a supercharger drive belt tensioner assembly engineered to maintain precise tension on the supercharger belt in Jaguar vehicles equipped with supercharged 3.0L V6 and 5.0L V8 engines. This tensioner applies constant, controlled pressure to the supercharger belt to ensure optimum performance and prevent belt slippage.

Litens is the world's largest supplier of original equipment (O.E.) power transmission products, and this part carries the OEM part number AJ813574 used across multiple Jaguar model lines.

Key Features:

• OEM-grade construction — engineered to meet original equipment form, fit, and function specifications
• Robust torsion spring design — provides consistent belt tension and alignment throughout service life
• Internal vibration damping — reduces belt vibration from engine firing pulses for quieter, smoother operation
• Automatic adjustment — self-adjusts for belt stretch and wear to maintain proper tension over time
• Durable pulley assembly — smooth plastic pulley (90mm OD × 30mm width × 16mm bearing ID) designed for supercharger belt routing
• Complete assembly — sold as a full tensioner and pulley unit ready for installation

A failing supercharger belt tensioner can cause belt slippage, squeaking, rattling, or premature belt wear. Replacing the tensioner and supercharger belt together at the same service interval is recommended to maximize system life and minimize labor. OEM reference number: AJ813574.