Accessory Drive Belt Idler Pulley Cummins 4991240 | 3978019, 3935015

High-Performance Accessory Drive Belt Idler Pulley

The Cummins 4991240 Idler Pulley is a critical component in your engine’s belt-driven system. Engineered from high-grade materials, this pulley ensures the rigidity needed for radial strength and unparalleled performance in heavy-duty environments. It plays a vital role in maintaining proper tension and alignment of the serpentine belt, which drives essential accessories such as the alternator, water pump, and air conditioning compressor.

Key Features and Benefits

• Enhanced Durability: Manufactured to withstand the rigors of heavy-duty diesel applications and harsh driving environments.
• Vibration Reduction: Specifically designed to reduce the effects of vibration and friction on the belt, preventing premature wear.
• Optimal Alignment: Keeps the accessory drive belt perfectly aligned, preventing excessive movement and dislodgment.
• Extended Service Life: By maintaining consistent tension, it protects other engine components and extends the life of the drive belt.

Engine Compatibility

This idler pulley is designed for a wide range of Cummins engine models, including but not limited to:

• B Series: 4B3.9, 6B5.9, B4.5, B5.9, B6.7 (including CM2350, CM2670 variants)
• C Series: 6C8.3, C8.3G, G8.3, C GAS PLUS
• ISB/ISD Series: ISB CM2150, ISB CM550, ISB CM850, ISB6.7, ISB4.5
• F Series: F3.8, F4.5

Technical Specifications

• Weight: 1.665 lb
• Dimensions: 8.45 x 4.55 x 4.15 in