3934936
Flexplate
Cummins®

The Cummins 3934936 Flexplate is a component designed for use in heavy-duty trucks. It serves as a link between the engine and the transmission, facilitating the transfer of power. This part is engineered to withstand the demanding conditions encountered in heavy-duty applications, ensuring reliable performance and durability.

Basic Concepts of a Flexplate

A flexplate is a component found in automatic transmission systems, analogous to the flywheel used in manual transmissions. Unlike a flywheel, which is typically made of solid metal, a flexplate is usually constructed from a series of stamped steel plates welded together. This design allows it to flex slightly, accommodating the variations in engine speed and torque that occur during operation. The flexplate’s primary function is to connect the engine to the torque converter, enabling the transmission of power from the engine to the drivetrain ¹.

Purpose of the Cummins 3934936 Flexplate

The Cummins 3934936 Flexplate serves as the interface between the engine and the torque converter. When the engine produces power, the flexplate transmits this power to the torque converter, which then multiplies the torque before sending it to the transmission. This process ensures efficient power transfer, allowing the truck to operate smoothly under various driving conditions ².

Key Features

The Cummins 3934936 Flexplate is characterized by several key features that enhance its performance and durability. It is constructed from high-strength materials, ensuring it can withstand the high torque and stress levels associated with heavy-duty applications. The design includes precise machining and balanced construction to minimize vibrations and ensure smooth operation. Additionally, the flexplate features a robust attachment system that securely connects it to both the engine and the torque converter ³.

Benefits

Using the Cummins 3934936 Flexplate offers several advantages. Its high-strength material composition and precise engineering contribute to improved durability and reliability. The flexplate’s design helps to reduce vibrations, leading to a smoother driving experience. Furthermore, its efficient power transmission capabilities contribute to enhanced overall performance and fuel efficiency in heavy-duty trucks ⁴.

Installation Considerations

Proper installation of the Cummins 3934936 Flexplate is vital to ensure optimal performance and longevity. Installation should be carried out by a qualified technician following the manufacturer’s guidelines. It is important to ensure that the flexplate is correctly aligned with the engine and torque converter to prevent damage and ensure efficient power transfer. Special tools may be required for installation, and it is advisable to refer to the manufacturer’s instructions for detailed procedures ⁵.

Common Issues and Troubleshooting

Flexplates, including the Cummins 3934936, can encounter issues over time. Common problems include cracks, warping, and excessive wear. Symptoms of a failing flexplate may include unusual noises, vibrations, or difficulty in shifting gears. If such symptoms are observed, it is important to inspect the flexplate for signs of damage. Troubleshooting may involve checking the alignment and condition of the flexplate, as well as ensuring that it is securely attached to the engine and torque converter. In cases of significant damage, replacement may be necessary ⁶.

Maintenance Tips

To ensure the longevity and optimal performance of the Cummins 3934936 Flexplate, regular maintenance is recommended. This includes periodic inspections for signs of wear or damage, ensuring proper alignment, and verifying secure attachment to the engine and torque converter. Additionally, maintaining the overall health of the drivetrain, including the torque converter and transmission, can contribute to the flexplate’s performance. Following the manufacturer’s maintenance schedule and guidelines will help in preserving the flexplate’s condition and functionality ⁷.

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 innovation, quality, and reliability in the automotive and heavy-duty truck industry. The company’s commitment to excellence is reflected in its wide range of products, including the Cummins 3934936 Flexplate, which is designed to meet the rigorous demands of heavy-duty applications ⁸.

Cummins Flexplate 3934936 Compatibility with Engine Models

The Cummins Flexplate part number 3934936 is designed to fit seamlessly with a variety of engine models, ensuring a reliable connection between the engine and the transmission. This flexplate is engineered to meet the specific requirements of the following engines:

• 4B3.9
• 6B5.9
• B5.9 G

When integrating the flexplate into these engines, it is crucial to ensure that the part is correctly aligned and securely fastened. The flexplate serves as a critical component in the engine assembly, facilitating the transfer of power from the engine to the transmission.

For the 4B3.9 and 6B5.9 engines, the flexplate is tailored to match the unique specifications of these models, ensuring optimal performance and durability. Similarly, the B5.9 G engine benefits from the precise engineering of the 3934936 flexplate, which is designed to handle the specific demands of this engine variant.

When installing the flexplate, it is essential to follow the manufacturer’s guidelines to ensure a proper fit and function. This includes verifying the alignment of the flexplate with the crankshaft and ensuring that all bolts and fasteners are tightened to the specified torque settings. Proper installation is key to maintaining the integrity of the engine and transmission connection, ultimately contributing to the overall performance and longevity of the engine ⁹.

Role of Part 3934936 Flexplate in Engine Systems

The Flexplate, specifically part 3934936, is an integral component in the operation of various engine systems. It serves as the connection point between the engine and the transmission, facilitating the transfer of rotational force from the crankshaft to the transmission input shaft.

In the context of the engine, the Flexplate is bolted to the rear of the crankshaft. As the engine operates, the crankshaft’s rotation is transmitted through the Flexplate to the torque converter, which is part of the transmission system. This transfer of motion is essential for the vehicle’s propulsion.

Moreover, the Flexplate accommodates the starter motor’s pinion gear. When the vehicle is started, the starter motor engages with the Flexplate, turning the crankshaft and initiating engine combustion. This interaction underscores the Flexplate’s role in both the starting mechanism and the continuous operation of the vehicle.

Additionally, the Flexplate’s design allows for slight flexing, which helps in absorbing the torsional vibrations generated by the engine. This flexibility is particularly important in smoothing out the power delivery to the transmission, enhancing the overall efficiency and reliability of the drivetrain.

In summary, part 3934936 Flexplate is a key component that ensures the seamless integration and operation of the engine and transmission systems, playing a significant role in both the starting process and the ongoing transmission of power throughout the vehicle ¹⁰.

Conclusion

The Cummins 3934936 Flexplate is a vital component in heavy-duty trucks, ensuring efficient power transfer from the engine to the transmission. Its robust design, precise engineering, and compatibility with various engine models make it a reliable choice for demanding applications. Proper installation, regular maintenance, and timely troubleshooting are essential to maximize the performance and longevity of this part.