Accessory Drive Belt Tensioner Cummins 3976834 | C3936213, 3957434, 3565151

High-Performance Cummins Accessory Drive Belt Tensioner

Keep your engine’s accessory drive system running smoothly with the Cummins 3976834 accessory drive belt tensioner. This heavy-duty component is engineered to provide constant, reliable tension to the drive belt, effectively preventing slippage, reducing noise, and ensuring the proper alignment of all belt-driven accessories. This part is also available under the numbers: C3936213, 3957434, 3565151.

Designed to withstand the demanding conditions of heavy-duty diesel engines, this belt tensioner features an 8-groove (8PK) pulley. It plays a critical role in dampening accessory drive belt vibrations caused by engine firing, which protects other system components and significantly extends the overall lifespan of the belt.

Engine Compatibility & Fitment

This accessory drive belt tensioner is compatible with a wide range of Cummins diesel engines, including:

• Cummins 4BT 4.5
• Cummins 6CT 8.3
• Cummins ISB Series (3.9, 4.5, 5.9, 6.7)
• Cummins QSB Series (3.9, 4.5, 5.9, 6.7)

Features & Benefits

• Optimal Alignment: Efficiently maintains proper accessory drive belt alignment to prevent uneven wear.
• Vibration Dampening: Absorbs and dampens belt vibrations caused by engine firing cycles.
• Heavy-Duty Construction: Manufactured from high-quality materials that resist heat, debris, and environmental wear.
• Enhanced Durability: Guarantees the rigidity needed for radial strength and long-lasting performance.

Cross-Reference / Interchange Part Numbers

This part replaces / is interchangeable with the following part numbers:

• 3976834
• C3936213
• 3957434
• 3565151
• 3081131
• 3936213
• 3937555
• 3973819