3937374
Breather Cover
Cummins®

Introduction

The Cummins 3937374 Breather Cover is a component designed for use in heavy-duty truck engines. Its purpose is to manage the pressure within the engine crankcase and facilitate the release of contaminants that may accumulate during engine operation. This part plays a role in maintaining the engine’s efficiency and longevity by ensuring that the crankcase environment remains clean and pressure-balanced ¹.

Function and Operation

The Cummins 3937374 operates by allowing air to enter and exit the engine crankcase as needed. This process helps to equalize pressure within the crankcase, which can fluctuate due to the engine’s operation. Additionally, the breather cover is equipped with filters that trap contaminants such as dust, dirt, and moisture, preventing them from circulating within the engine. This function is vital for preserving the integrity of engine components and ensuring smooth operation ².

Key Features

This Cummins part is constructed with durable materials that can withstand the harsh conditions of heavy-duty truck engines. It features a robust sealing mechanism to prevent leaks and ensure a secure fit on the engine. The design includes integrated filters that are specifically engineered to capture a wide range of contaminants. These features contribute to the breather cover’s effectiveness in protecting the engine.

Benefits of Using the Cummins 3937374 Breather Cover

Utilizing this part can lead to several advantages for heavy-duty truck engines. It contributes to improved engine performance by maintaining optimal crankcase pressure and cleanliness. The breather cover also aids in extending the engine’s lifespan by reducing the risk of contamination-related wear and tear. Furthermore, it provides a layer of protection against the ingress of harmful particles, which can otherwise lead to engine damage.

Installation Process

Installing the Cummins 3937374 requires careful attention to detail. The process involves securing the cover onto the engine’s crankcase, ensuring that all seals are properly aligned and tightened to the manufacturer’s specifications. It is important to use the appropriate tools for this task to avoid damaging the component or the engine. Following the installation instructions provided by Cummins ensures that the breather cover is fitted correctly and functions as intended.

Maintenance and Troubleshooting

To ensure the Cummins 3937374 operates effectively, regular maintenance is necessary. This includes periodic inspections to check for signs of wear or damage, and cleaning or replacing the filters as needed. Common issues that may arise include clogged filters or leaks, which can be addressed by cleaning the component or making necessary repairs. Adhering to a maintenance schedule helps to prevent problems and ensures the breather cover continues to perform its function optimally.

Compatibility and Application

The Cummins 3937374 is designed for specific types of engines and truck models. It is important to verify compatibility with the engine make and model to ensure proper fit and function. Application notes provided by Cummins can offer additional guidance on the correct use of this component in various engine configurations.

Safety Considerations

When working with the Cummins 3937374, it is important to observe safety guidelines. This includes wearing appropriate personal protective equipment, such as gloves and safety glasses, to protect against potential hazards. Additionally, ensuring that the engine is cool and the vehicle is securely parked before beginning any work on the breather cover is crucial for safety. Following these precautions helps to prevent accidents and ensures a safe working environment.

Cummins Corporation Overview

Cummins Inc. is a global power leader that designs, manufactures, and distributes a wide range of power solutions, including engines, filtration, and emissions control technologies. With a history spanning over a century, Cummins has established a reputation for innovation, quality, and reliability in the automotive industry. The company’s product range extends beyond heavy-duty trucks to include applications in construction, agriculture, power generation, and more, demonstrating its commitment to providing comprehensive power solutions.

Compatibility of Cummins Breather Cover 3937374

The Cummins Breather Cover part number 3937374 is designed to fit several of the company’s engine models. This breather cover is a component that helps maintain the integrity of the engine’s crankcase ventilation system. It prevents contaminants from entering the engine while allowing gases to escape.

Compatible Engines

• 6B5.9
• ISB CM550
• ISB CM850

For the ISB series engines, the breather cover is engineered to fit both the CM550 and CM850 variants. These engines are known for their robust performance and reliability, often used in heavy-duty applications.

• QSB5.9 44 CM550
• QSB5.9 CM850

Similarly, the QSB5.9 engines, both the 44 CM550 and CM850 variants, are also compatible with the breather cover part number 3937374. These engines are typically utilized in a variety of demanding environments, from agricultural to industrial applications.

Installation and Usage

When installing the breather cover, it is essential to ensure a proper fit and seal to maintain the engine’s efficiency and longevity. Regular maintenance checks should be performed to confirm that the cover is not damaged and is securely fastened. This will help in preventing any unwanted contaminants from entering the engine and ensure the crankcase ventilation system operates effectively.

Role of Part 3937374 Breather Cover in Engine Systems

The 3937374 Breather Cover is an integral component in the arrangement of various engine systems, ensuring the efficient operation and longevity of the engine.

Integration with Oil Systems

In the oil fill and breather systems, the 3937374 plays a significant role. It is designed to interface with the crankcase, allowing for the regulated release of pressure built up within. This is essential for maintaining a stable environment for the oil to circulate effectively. The breather cover ensures that any excess pressure is vented, preventing oil from being forced out through seals and gaskets, which could lead to leaks and contamination.

Coordination with Breather Housing

When integrated with the breather housing, the 3937374 facilitates the separation of oil mist and vapor from the crankcase ventilation system. This is achieved through a series of baffles and filters within the housing, which the breather cover seals. The cover ensures that only clean air is expelled, while oil particles are returned to the sump, maintaining oil levels and reducing the risk of sludge formation.

Functionality with Cam Follower and Cover Systems

In engines equipped with cam followers, the 3937374 contributes to the overall efficiency of the valve train. By maintaining a clean and pressurized environment within the crankcase, it assists in the proper lubrication of cam followers, reducing wear and enhancing performance. The cover also aids in keeping contaminants away from sensitive components, prolonging their service life.

Application in Oil Catch Kits

The 3937374 is often utilized in conjunction with front and side oil catch kits. These kits are designed to capture oil mist and vapor that would otherwise be expelled into the atmosphere. The breather cover, by sealing the crankcase and directing airflow through the catch kits, ensures that a significant portion of this oil is recaptured and returned to the sump. This not only improves engine efficiency but also reduces environmental impact by minimizing oil emissions.

Conclusion

The Cummins 3937374 Breather Cover is a versatile component that enhances the functionality of various engine systems. Its role in pressure regulation, oil management, and contamination control is vital for the optimal performance and durability of the engine.