3936213
Belt Tensioner
Cummins®

Introduction

The Cummins 3936213 Belt Tensioner is a component designed for use in commercial trucks. It serves a significant role in ensuring the proper operation of the truck’s engine by maintaining the correct tension on the engine’s accessory drive belts. This tensioner is integral to the efficient and reliable performance of the truck’s engine system.

Basic Concepts of Belt Tensioners

A belt tensioner is a device used in a vehicle’s engine system to keep the drive belts at the optimal tension. It operates by automatically adjusting the position of the belt to compensate for wear and changes in temperature, ensuring that the belt remains taut and functions effectively. Proper belt tension is essential for the efficient transfer of power from the engine to various accessories such as the alternator, water pump, and air conditioning compressor ¹.

Purpose of the Cummins 3936213 Belt Tensioner

The Cummins 3936213 Belt Tensioner plays a role in the engine’s accessory drive system by maintaining the necessary tension on the belts that drive the engine’s accessories. This ensures that these components receive the power they need to operate efficiently. By keeping the belts properly tensioned, the tensioner helps to prevent slippage, reduce wear, and ensure the reliable operation of the engine’s accessories.

Key Features

The Cummins 3936213 Belt Tensioner is designed with several features that enhance its performance and durability. It is constructed from high-quality materials that are resistant to wear and corrosion, ensuring long-lasting operation in the demanding environment of a commercial truck engine. The tensioner’s design includes precision-machined components and a robust spring mechanism that provides consistent tension across a wide range of operating conditions.

Benefits

Using the Cummins 3936213 Belt Tensioner offers several benefits. It contributes to improved engine efficiency by ensuring that the accessory drive belts operate at the optimal tension. This reduces the risk of belt slippage and wear, leading to enhanced reliability and longevity of both the belts and the engine’s accessories. Additionally, the tensioner’s design helps to minimize noise and vibration, contributing to a smoother and more comfortable driving experience ².

Installation

When installing the Cummins 3936213 Belt Tensioner, it is important to follow the manufacturer’s guidelines and best practices. This includes ensuring that the tensioner is properly aligned and secured in place, and that the belts are correctly routed and tensioned. Special attention should be paid to any specific requirements or considerations outlined by the manufacturer to ensure optimal performance and longevity of the tensioner and the engine’s accessory drive system.

Maintenance and Troubleshooting

Regular maintenance of the Cummins 3936213 Belt Tensioner is important to ensure its continued reliable operation. This includes periodic inspection of the tensioner and belts for signs of wear or damage, and addressing any issues promptly to prevent further damage or failure. Common signs of wear or failure to watch for include unusual noise, vibration, or visible damage to the tensioner or belts. Troubleshooting tips for common issues may include checking the tensioner’s alignment, inspecting the spring mechanism for proper function, and ensuring that the belts are correctly tensioned.

Cummins Overview

Cummins Inc. is a global power leader that designs, manufactures, and distributes engines, filtration, and power generation products. With a history of innovation and commitment to quality, Cummins has established a strong reputation in the commercial truck industry. The company’s engine components, including the Cummins 3936213 Belt Tensioner, are designed with a focus on reliability, performance, and durability, reflecting Cummins’ dedication to providing high-quality products to its customers.

Belt Tensioner 3936213 Compatibility with Cummins Engines

The Belt Tensioner part number 3936213, manufactured by Cummins, is designed to fit a variety of Cummins engines. This part is crucial for maintaining the proper tension of the engine’s serpentine belt, ensuring efficient power transmission and preventing belt slippage.

Compatible Engines

• 4B3.9
• 6B5.9
• 6C8.3
• B4.5
• B5.9 G
• B5.9 GAS PLUS CM556
• B6.7 CM2350 B135B
• B6.7 CM2670 B153B
• B6.7 CM2670 B164C
• B6.7 G CMOH6.0 B125
• C GAS PLUS CM556
• C8.3 G
• ISB CM2150
• ISB CM550
• ISB CM850
• ISB/ISD4.5 CM2150 B119
• ISB/ISD6.7 CM2150 SN
• ISBE CM2150
• ISBE CM800
• ISBE4 CM850
• ISC CM554
• ISC CM850
• ISD4.5 CM2220 D108
• ISL CM554
• ISL G CM2180

Grouping of Compatible Engines

The Belt Tensioner 3936213 is compatible with a broad range of Cummins engines, including:

• B Series Engines: B4.5, B5.9 G, B5.9 GAS PLUS CM556, B6.7 CM2350 B135B, B6.7 CM2670 B153B, B6.7 CM2670 B164C, B6.7 G CMOH6.0 B125, C GAS PLUS CM556
• ISB Series Engines: ISB CM2150, ISB CM550, ISB CM850, ISB/ISD4.5 CM2150 B119, ISB/ISD6.7 CM2150 SN
• ISBE Series Engines: ISBE CM2150, ISBE CM800, ISBE4 CM850
• ISC Series Engines: ISC CM554, ISC CM850
• ISD Series Engines: ISD4.5 CM2220 D108
• ISL Series Engines: ISL CM554, ISL G CM2180
• Other Series Engines: 4B3.9, 6B5.9, 6C8.3, C8.3 G

This part ensures that the serpentine belt maintains the correct tension across these diverse engine models, contributing to the overall efficiency and longevity of the engine.

Role of Part 3936213 Belt Tensioner in Engine Systems

The part 3936213 Belt Tensioner is an integral component in maintaining the efficiency and reliability of various engine systems. It ensures that the belt remains properly tensioned, which is essential for the optimal operation of several driven components.

Interaction with the Alternator Drive

The Belt Tensioner works in conjunction with the alternator drive to maintain the correct tension on the belt. This ensures that the alternator receives consistent power transmission, allowing it to efficiently charge the battery and supply electricity to the vehicle’s electrical systems.

Coordination with the Fan Drive

For the fan drive, the Belt Tensioner plays a significant role in keeping the belt taut. This is important for the fan to operate effectively, ensuring proper cooling of the engine by circulating air through the radiator.

Relationship with the Water Pump Drive

In the water pump drive system, the Belt Tensioner helps maintain the necessary tension on the belt. This ensures that the water pump operates smoothly, facilitating the circulation of coolant through the engine to prevent overheating.

Functionality with the Refrigerant Compressor

When integrated with the refrigerant compressor, the Belt Tensioner ensures that the belt remains under the appropriate tension. This is vital for the compressor to function correctly, providing efficient cooling in the vehicle’s air conditioning system.

Support for the Pulley System

The Belt Tensioner also supports the pulley system by maintaining consistent belt tension. This is important for the smooth operation of all pulley-driven components, reducing wear and tear and enhancing the longevity of the belt and associated parts.

Integration with the Water Pump

In the context of the water pump, the Belt Tensioner ensures that the belt is properly tensioned. This is essential for the water pump to effectively circulate water through the engine, maintaining optimal temperature and preventing damage from overheating.

Overall System Efficiency

By ensuring that the belt remains properly tensioned across all these components—alternator, fan, water pump, and refrigerant compressor—the Belt Tensioner contributes to the overall efficiency and reliability of the engine system. It helps in reducing slippage, minimizing noise, and enhancing the performance of the driven components.

Conclusion

The Cummins 3936213 Belt Tensioner is a critical component in the efficient and reliable operation of commercial truck engines. By maintaining the correct tension on the engine’s accessory drive belts, this part ensures that the engine’s accessories receive the power they need to operate efficiently. Its robust design, compatibility with a wide range of Cummins engines, and the benefits it offers in terms of engine efficiency and reliability make it an essential component for commercial truck operators.