3873677
BREATHER,CRANKCASE
Cummins®

The BREATHER, CRANKCASE (Part #3873677) manufactured by Cummins is a component designed to facilitate the venting of crankcase vapors in commercial truck engines. Its role is significant in maintaining the operational integrity and efficiency of the engine. By managing the pressure within the crankcase, this breather contributes to the overall health and performance of the engine ¹.

Basic Concepts of Crankcase Breathers

A crankcase breather is a device that allows the release of gases and vapors that accumulate within the engine’s crankcase. These vapors are a byproduct of the combustion process and lubrication system. The breather’s function is to vent these vapors to the atmosphere or recirculate them back into the intake system, thereby preventing pressure build-up inside the crankcase. This process is vital for maintaining engine health, as excessive pressure can lead to oil leaks, reduced lubrication efficiency, and potential engine damage ².

Operation of the BREATHER, CRANKCASE

The BREATHER, CRANKCASE operates by allowing crankcase vapors to escape while preventing the ingress of contaminants. As the engine runs, vapors generated within the crankcase are directed through the breather. The design of the breather ensures that these vapors are either released into the atmosphere or routed back into the intake system for re-combustion. This process helps maintain a stable pressure environment within the crankcase, which is crucial for the efficient operation of the engine ³.

Purpose and Role in Truck Operation

In the context of commercial trucks, the BREATHER, CRANKCASE plays a specific role in ensuring the engine’s lubrication system functions correctly. By managing crankcase pressure, it helps maintain the integrity of the oil film that lubricates moving parts. Additionally, it contributes to emissions control by ensuring that crankcase vapors are properly managed, either through release or recirculation. This dual role enhances both engine performance and environmental compliance.

Key Features

The Cummins BREATHER, CRANKCASE is designed with several key features that enhance its performance. It is constructed from durable materials to withstand the harsh operating conditions typical of commercial truck engines. The design includes filtration elements to prevent contaminants from entering the crankcase, ensuring the purity of the lubrication system. Additionally, the breather is engineered to facilitate efficient vapor management, contributing to the overall reliability and longevity of the engine.

Benefits of Using Cummins BREATHER, CRANKCASE

Using the Cummins BREATHER, CRANKCASE offers several benefits. It contributes to improved engine efficiency by maintaining optimal crankcase pressure, which in turn supports effective lubrication. Reduced emissions are another advantage, as the breather ensures that crankcase vapors are managed in an environmentally responsible manner. Furthermore, the durable construction and reliable performance of the breather enhance the overall durability and service life of the engine.

Installation Considerations

Proper installation of the BREATHER, CRANKCASE is vital to ensure its optimal performance and longevity. It should be mounted according to the manufacturer’s specifications to ensure correct orientation and secure fitment. Attention to sealing surfaces is important to prevent leaks, and the breather should be connected to the appropriate venting or recirculation system as per the engine’s design. Regular inspection during installation can help identify any potential issues that may affect performance.

Maintenance and Troubleshooting

Routine maintenance of the BREATHER, CRANKCASE involves periodic inspection for signs of wear, damage, or contamination. Cleaning or replacing filtration elements as needed ensures continued efficient operation. Troubleshooting common issues may involve checking for proper venting, ensuring there are no obstructions in the breather path, and verifying that the breather is securely mounted. Addressing these aspects can help maintain the breather’s performance and contribute to the engine’s reliability.

Engine Compatibility for Part 3873677

The BREATHER, CRANKCASE part 3873677, manufactured by Cummins, is designed to fit a variety of engine models. Here is a breakdown of the engines it is compatible with:

G855 Series

• G855
• G855 CM558

GTA855 Series

• GTA855 CM558 (CM2358)

G101 Series

• G101

K19 Series

• K19
• KTA19GC
• KTA19GC CM558

N14 Series

• N14 G

QSK19 Series

• QSK19 CM500

This part is engineered to ensure optimal performance and reliability across these engine models, providing a crucial function in the crankcase ventilation system.

Understanding the Integration of Part 3873677 in Engine Systems

The BREATHER, CRANKCASE is an essential component in maintaining the health and efficiency of engine systems. Its role is to manage the pressure within the crankcase by allowing gases to escape, thus preventing the buildup of harmful contaminants and ensuring smooth engine operation.

Interaction with the Valve Cover and Rocker Lever Cover

The valve cover and rocker lever cover are directly connected to the crankcase breather system. The breather is typically installed in a designated location on these covers, facilitating the escape of gases from the crankcase. This setup helps in reducing the pressure that can otherwise lead to oil leaks and component wear.

Coordination with the Cam Follower Cover

In engines where a cam follower cover is present, the crankcase breather works in tandem to ensure that the pressure is evenly distributed. This coordination is vital for the longevity of the camshaft and its followers, as excessive pressure can cause premature wear or failure of these components.

Base Parts and Rocker Housing Cover

The integration of the breather with base parts and the rocker housing cover (rocker hsg cov) is designed to optimize the flow of gases. Proper arrangement and installation of these parts ensure that the breather can effectively vent gases without causing disruptions in other engine functions.

Role in the CCV System Retrofit Kit

When retrofitting an engine with a Crankcase Ventilation (CCV) system, the breather plays a significant role. It works alongside the retrofit kit components to enhance the efficiency of the ventilation process. This integration helps in reducing emissions and improving overall engine performance.

Breather Location and System Arrangement

The strategic breather location within the engine arrangement is critical for its function. Whether it is positioned on the valve cover, rocker lever cover, or another part, its location is designed to provide the most effective ventilation path. This careful arrangement ensures that the breather can perform its role without interfering with other engine operations.

Comprehensive System Interaction

In summary, the BREATHER, CRANKCASE interacts with various engine components including the valve cover, rocker lever cover, cam follower cover, base parts, and rocker housing cover. Its proper installation and integration within the engine system are essential for maintaining optimal engine health and performance.

Conclusion

The BREATHER, CRANKCASE (Part #3873677) by Cummins is a critical component in the maintenance and efficiency of commercial truck engines. Its role in managing crankcase pressure, ensuring proper lubrication, and contributing to emissions control underscores its importance in engine health and performance. Proper installation, maintenance, and understanding of its integration within the engine system are essential for maximizing its benefits and ensuring the longevity of the engine.