3971746
V Ribbed Belt
Cummins®

Introduction

The Cummins 3971746 V-Ribbed Belt is a critical component in commercial trucks, facilitating the transfer of power from the engine to various ancillary components. Understanding its function and importance is essential for maintaining the efficiency and reliability of truck operations.

Basic Concepts of V-Ribbed Belts

V-Ribbed Belts, characterized by their trapezoidal cross-section, are designed to fit snugly into corresponding grooves on pulleys, enhancing grip and reducing slippage for efficient power transmission ¹. In truck drivetrains, V-Ribbed Belts connect the engine to components such as the alternator, water pump, and air conditioning compressor. They differ from flat belts or timing belts in construction and application, primarily used for driving multiple peripheral components ².

Purpose of the 3971746 V-Ribbed Belt

The Cummins 3971746 V-Ribbed Belt is engineered to drive ancillary components in commercial trucks. It connects the engine to the alternator for electrical power generation, the water pump for coolant circulation, and the air conditioning compressor for climate control. This ensures these components receive the necessary power, contributing to the vehicle’s overall functionality and comfort.

Key Features

This Cummins part is constructed from high-quality materials that enhance performance and durability. Its design includes multiple ribs that increase the contact surface area with pulleys, improving grip and efficiency. The belt may feature reinforced edges to resist wear and a special coating to reduce friction and heat buildup.

Benefits

Using the Cummins 3971746 V-Ribbed Belt offers several advantages. Its design and construction materials contribute to improved efficiency in power transmission, enhancing the overall performance of the truck. The belt’s durability ensures reliability under demanding conditions, reducing the frequency of replacements. Furthermore, its construction helps extend the belt’s lifespan, providing longevity compared to other belts.

Installation

Installing the Cummins 3971746 V-Ribbed Belt requires adherence to specific guidelines and best practices to ensure proper function and longevity. This may involve using particular tools to route the belt correctly around pulleys and adjusting tension to manufacturer specifications. Following these procedures helps prevent issues such as slippage or premature wear.

Maintenance

Regular maintenance of the Cummins 3971746 V-Ribbed Belt is crucial for optimal performance and longevity. This includes periodic inspections for signs of wear, cracking, or glazing. Tensioning the belt according to manufacturer guidelines ensures efficient power transmission and reduces stress on the belt and pulleys. Replacement intervals should be observed to prevent failure and maintain vehicle efficiency.

Troubleshooting

Common issues with the Cummins 3971746 V-Ribbed Belt may include slippage, noise, or visible damage. Troubleshooting these problems involves inspecting the belt for wear, ensuring proper tension, and checking for alignment issues with pulleys. Addressing these concerns promptly can help maintain the belt’s performance and extend its lifespan.

Cummins Overview

Cummins Inc. is a global power leader that designs, manufactures, and distributes engines, filtration, and power generation products. With a history spanning over a century, Cummins has established a reputation for quality and innovation in the commercial truck industry. Its product range includes engines, powertrain components, and aftermarket parts, all designed to meet the demanding requirements of commercial applications.

V-Ribbed Belt 3971746 Compatibility with Cummins Engines

The V-Ribbed Belt part number 3971746, manufactured by Cummins, is designed to fit a variety of Cummins engines. This belt is crucial for the proper functioning of the engine’s ancillary components, ensuring that systems such as the alternator, water pump, and air conditioning compressor operate efficiently.

Compatible Engines

• B6.7 CM2350 B135B
• ISB/ISD4.5 CM2150 B119
• ISB6.7 CM2250
• ISB6.7 CM2350 B101
• ISB6.7 G CM2180 B118
• ISC8.3 CM2250
• ISL9 CM2250
• QSB6.7 CM2250
• QSB6.7 CM2350 B105
• QSL8.9 CM2150 L141
• QSL9 CM2250
• QSL9 CM2350 L102
• QSL9 CM850 (CM2850)

Grouping of Compatible Engines

• ISB6.7 Series:

  • ISB6.7 CM2250
  • ISB6.7 CM2350 B101
  • ISB6.7 G CM2180 B118

• QSB6.7 Series:

  • QSB6.7 CM2250
  • QSB6.7 CM2350 B105

• QSL9 Series:

  • QSL9 CM2250
  • QSL9 CM2350 L102
  • QSL9 CM850 (CM2850)

• Others:

  • B6.7 CM2350 B135B
  • ISB/ISD4.5 CM2150 B119
  • ISC8.3 CM2250
  • ISL9 CM2250
  • QSL8.9 CM2150 L141

This belt is engineered to meet the specific requirements of these engines, ensuring durability and reliability under various operating conditions. It is essential to verify the correct fitment of this belt with the respective engine to maintain optimal performance and longevity of the engine’s ancillary systems.

Role of Part 3971746 V-Ribbed Belt in Engine Systems

The V-Ribbed Belt, identified as part 3971746, is integral to the efficient operation of several engine components. Its primary function is to transfer rotational force from the engine’s crankshaft to various auxiliary components, ensuring they operate in sync with the engine’s performance.

Drive Mechanism

The V-Ribbed Belt is wrapped around the crankshaft pulley and other accessory pulleys, forming a drive mechanism. This setup allows the belt to transmit power effectively. As the crankshaft rotates, the V-Ribbed Belt engages with the pulleys, transferring this rotational energy to connected components.

Water Pump Operation

One of the key components driven by the V-Ribbed Belt is the water pump. The belt engages with the water pump pulley, causing the pump impeller to rotate. This rotation facilitates the circulation of coolant through the engine’s passages, maintaining optimal operating temperatures and preventing overheating ³.

Water Pump Drive Integration

The water pump drive system relies on the consistent and reliable transfer of power from the V-Ribbed Belt. The belt’s ribbed design enhances grip and reduces slippage, ensuring that the water pump receives a steady supply of power. This consistent drive is essential for the water pump to function correctly, providing continuous coolant flow.

Conclusion

In summary, the Cummins 3971746 V-Ribbed Belt plays a significant role in the coordinated operation of the drive mechanism and the water pump, contributing to the overall efficiency and reliability of the engine system. Regular maintenance and proper installation are crucial to ensure the longevity and performance of this critical component.