3937020
Flexplate
Cummins®

The Cummins 3937020 Flexplate is a component designed for use in heavy-duty trucks, specifically tailored to work with certain Cummins engines. Its role is to facilitate the transfer of power from the engine to the transmission through the torque converter. Understanding its function and significance is key to maintaining the efficiency and reliability of heavy-duty truck operations.

Basic Concepts of a Flexplate

A flexplate is a component in the drivetrain of vehicles equipped with automatic transmissions. Unlike a traditional flywheel, which is used in manual transmissions and is typically made of solid metal, a flexplate is usually made from a stamped steel construction. This design allows it to flex slightly, accommodating the variations in engine speed and load. The flexplate connects the engine to the torque converter, which in turn connects to the transmission, enabling the smooth transfer of power ¹.

Purpose of the 3937020 Flexplate

The 3937020 Flexplate serves as the interface between the engine and the torque converter in heavy-duty trucks. It is designed to withstand the high torque outputs of Cummins engines, ensuring efficient power transmission. The flexplate’s design allows it to absorb some of the engine’s vibrations, contributing to a smoother operation of the drivetrain. Its interaction with the torque converter is pivotal in managing the flow of power from the engine to the transmission, especially during gear changes and under varying load conditions ².

Key Features

The 3937020 Flexplate is engineered with specific design and construction features to meet the demands of heavy-duty applications. It is typically made from high-strength materials to ensure durability under high torque conditions. The flexplate is equipped with a specific number of bolts for secure attachment to the engine crankshaft. Its design may include features such as damping elements to reduce vibrations and enhance the smoothness of power transmission ³.

Benefits of Using the 3937020 Flexplate

Utilizing the 3937020 Flexplate offers several advantages. Its robust construction contributes to improved durability, allowing it to withstand the rigors of heavy-duty truck operations. The design of the flexplate enhances the performance of the drivetrain by ensuring efficient power transfer and reducing vibrations. Additionally, it is specifically engineered for compatibility with certain Cummins engines, ensuring optimal fit and function.

Installation Considerations

When installing the 3937020 Flexplate, it is important to follow guidelines and best practices to ensure proper fitment and function. This may include using specific tools for alignment and torque specifications for bolt tightening. Careful attention to these details during installation helps to ensure the flexplate operates as intended, contributing to the overall reliability of the drivetrain.

Troubleshooting Common Issues

Common issues associated with flexplates include cracking or failure, often due to excessive stress or improper installation. Troubleshooting these problems may involve inspecting the flexplate for signs of damage, ensuring proper installation, and addressing any underlying issues that may contribute to flexplate stress, such as engine imbalance or transmission problems.

Maintenance Tips

To ensure the longevity and optimal performance of the 3937020 Flexplate, regular maintenance is recommended. This includes periodic inspections for signs of wear or damage, ensuring proper alignment and fitment, and addressing any issues promptly. Following manufacturer guidelines for maintenance intervals and procedures can help prevent common problems and extend the life of the flexplate.

Cummins Corporation 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 itself as a trusted name in the automotive and heavy-duty truck industry, known for its commitment to quality, innovation, and customer satisfaction. The company’s extensive product line and technological advancements continue to drive the efficiency and performance of vehicles worldwide.

Flexplate 3937020 Compatibility with Cummins Engines

The Flexplate 3937020, manufactured by Cummins, is designed to fit a variety of Cummins engines, ensuring a secure and efficient connection between the engine and the transmission. This part is integral for the proper functioning of the engine’s power transfer system. Below is a detailed description of the compatibility of this flexplate with various Cummins engines:

ISB Series Engines

• ISB CM2150
• ISB CM550
• ISB CM850
• ISB/ISD6.7 CM2150 SN
• ISB6.7 CM2250
• ISB6.7 CM2350 B101
• ISB6.7 G CM2180 B118

The Flexplate 3937020 is specifically engineered to fit the ISB series engines, which include the CM2150, CM550, CM850, and various 6.7-liter configurations. This ensures a precise fit and optimal performance for these engines.

ISBE Series Engines

• ISBE CM2150
• ISBE4 CM850

The ISBE series engines, such as the CM2150 and CM850, are also compatible with the Flexplate 3937020. This compatibility is crucial for maintaining the integrity of the engine-transmission interface.

ISC Series Engines

• ISC CM2150
• ISC CM554
• ISC CM850
• ISC8.3 CM2250

The Flexplate 3937020 is designed to fit the ISC series engines, including the CM2150, CM554, CM850, and the 8.3-liter CM2250. This ensures that these engines can operate smoothly with the specified flexplate.

ISL Series Engines

• ISL CM2150
• ISL CM554
• ISL G CM2180
• ISL9 CM2150 SN
• ISL9 CM2250

The ISL series engines, such as the CM2150, CM554, CM2180, and the 9-liter configurations, are also compatible with the Flexplate 3937020. This compatibility is essential for the proper functioning of these engines.

QSB Series Engines

• QSB5.9 30 CM550
• QSB6.7 CM2250
• QSB6.7 CM2350 B105
• QSB6.7 CM850 (CM2850)
• QSB7 CM2880 B117

The Flexplate 3937020 is also suitable for the QSB series engines, including the 5.9-liter CM550, 6.7-liter configurations, and the 7-liter CM2880. This ensures that these engines can be paired with the flexplate for optimal performance.

L9 Series Engine

• L9 CM2670 L128B

The Flexplate 3937020 is compatible with the L9 series engine, specifically the CM2670 L128B. This compatibility ensures that the engine can be paired with the flexplate for reliable operation.

This comprehensive compatibility ensures that the Flexplate 3937020 can be used across a wide range of Cummins engines, providing a reliable and efficient connection between the engine and the transmission.

Role of Part 3937020 Flexplate in Engine Systems

The part 3937020 Flexplate is an essential component in the operation of automatic transmission systems, interfacing directly with several key engine components to ensure smooth and efficient power transfer.

Interaction with the Flywheel

In automatic transmission vehicles, the Flexplate replaces the traditional flywheel found in manual transmission systems. Unlike the flywheel, which engages with the starter motor through a ring gear to crank the engine, the Flexplate is designed to connect the engine to the torque converter. This connection is vital for the transmission of rotational force from the engine to the transmission system.

Connection to the Torque Converter

The Flexplate is bolted to the rear of the engine’s crankshaft, similar to how a flywheel is attached. Its primary function is to transmit the engine’s rotational energy to the torque converter, which then multiplies this torque before sending it to the transmission. This setup allows for a more fluid transfer of power, accommodating the demands of automatic transmissions.

Integration with the Starter Motor

During engine start-up, the Flexplate engages with the starter motor via a ring gear embedded within it. This engagement spins the crankshaft, initiating the combustion process. The design of the Flexplate ensures that it can withstand the repeated stress of this engagement without warping or failing, maintaining reliable starts over the vehicle’s lifespan.

Role in Vibration Dampening

One of the advanced features of the Flexplate is its ability to help dampen vibrations produced by the engine. This is particularly important in high-performance or high-torque applications where engine vibrations can be more pronounced. By absorbing some of these vibrations, the Flexplate contributes to a smoother operation of the drivetrain, enhancing both driver comfort and component longevity.

Summary of Component Interaction

In summary, the part 3937020 Flexplate plays a significant role in the automatic transmission system by effectively linking the engine’s crankshaft to the torque converter. It ensures efficient power transmission, reliable engine starts, and helps in reducing drivetrain vibrations. Its integration with other components like the starter motor and torque converter underscores its importance in maintaining the overall performance and reliability of the engine system.

Conclusion

The Cummins 3937020 Flexplate is a critical component in the drivetrain of heavy-duty trucks, designed to facilitate efficient power transfer from the engine to the transmission. Its robust construction, compatibility with various Cummins engines, and role in vibration dampening contribute to the overall performance and reliability of the vehicle. Proper installation, maintenance, and understanding of its function are essential for ensuring the longevity and optimal operation of this Cummins part.