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A drive belt tensioner is a pulley mounted on a spring mechanism or adjustable pivot point that is used to keep tension on the engine belts. ... Both are used to keep tension on the engine serpentine belts so that they can drive the various engine accessories.
If equipped with a tensioner screw, back off the tensioner screw. Then, push the alternator toward the other pulleys, loosening the belt. To loosen an NAI tensioner, loosen the locking nut or bolt, then back off the tensioner screw. Push the pulley toward the other pulleys or accessories, loosening the belt.

Advantages of Tension Pulley (Idler Pulley):

1. Maintains Optimal Belt Tension - Ensures proper grip and prevents slippage.

2. Reduces Wear & Vibration - Extends belt and component lifespan by minimizing stress.

3. Compact Design - Saves space in engine/assembly layouts.

4. Low Friction - Uses bearings for smooth rotation, improving efficiency.

5. Easy Replacement - Modular design simplifies maintenance.

Common Applications:

• Automotive Engines: Supports serpentine/timing belts in cars/trucks.

• Industrial Machinery: Guides belts in conveyors, pumps, and HVAC systems.

• Agricultural Equipment: Used in combines, tractors, and harvesters.