An automatic timing belt tensioner is a highly engineered and tuned component of a modern OHC engine. Due to the extreme sensitivity of each engine application, Original Equipment carefully develop and validate each and every new timing drive application. Correct tension and damping levels are paramount to ensuring proper timing drive operation and performance. Compromises in the design, materials or manufacturing of the automatic belt tensioner could result in catastrophic engine failure.

1. INSTALLATION SHAFT: Ensures tensioner is located in its proper engine position when installed.

2. FRONT PLATE: Retains the complete tensioner assembly axially.

Due to mechanical staking feature, tensioners are non-serviceable and cannot be disassembled safely.

3. THRUST WASHER: Provides alignment and self-lubricated sliding surface for the arm.

4. PULLEY: Steel or plastic construction, depending on application.

5. BALL BEARING: Maintenance free and sealed for life component. Precision, high temperature construction.

6. PIVOT BUSHING: Self-lubricating, highly wear resistant polymer component. Primary source of damping. Function is to ensure proper tensioner arm alignment relative to belt and counters tilting.

7. ARM: Precision, aluminum diecast component. Transmits the torque of the spring to the pulley to provide constant belt tension. Also incorporates the operating range stops that provide ‘anti-kickback’ feature.

8. SPRING: Critical part of the tensioner. Designed to provide optimum belt tension control for each application.

9. SPRING SUPPORT: An engineered, highly wear resistant polymer material that provides secondary damping for smooth timing drive operation.

10. PIVOT SHAFT: Maintains alignment of the arm and pulley relative to the engine.

11. BASE PLATE/BRACKET: Ensures proper placement and angular location on engine. Also provides the 2nd part of anti-kickback stop feature.

Represents the construction of a typical patented Litens Tensioner.

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