3684740
BREATHER,CRANKCASE
Cummins®

Introduction

The BREATHER, CRANKCASE part #3684740, manufactured by Cummins, is a critical component in the operation of commercial trucks. This part is essential for maintaining the efficiency and reliability of heavy-duty truck engines by ensuring proper ventilation within the crankcase.

Basic Concepts of Crankcase Breathers

Crankcase breathers are designed to release gases and vapors that accumulate within the engine’s crankcase. These breathers provide a controlled path for these byproducts to escape, which helps maintain a stable pressure environment within the crankcase. Proper ventilation is vital for preventing the buildup of pressure and contaminants, which can adversely affect engine performance and longevity ¹.

Purpose of the 3684740 Breather, Crankcase

The 3684740 Breather, Crankcase is specifically designed to manage pressure and contaminants within the crankcase of heavy-duty truck engines. By allowing the escape of gases and vapors, it helps maintain an optimal pressure level, which is essential for the efficient operation of the engine. Additionally, it aids in keeping the crankcase environment clean by preventing the accumulation of contaminants that could lead to wear and reduced performance.

Key Features

The 3684740 Breather, Crankcase incorporates several design elements and materials that enhance its performance. It is constructed from durable materials that can withstand the harsh conditions within the engine compartment. The design includes features that ensure effective ventilation while preventing the ingress of external contaminants. Additionally, it is engineered to be compatible with various Cummins engine models, ensuring seamless integration into the engine system.

Benefits

The use of the 3684740 Breather, Crankcase offers several benefits. It contributes to improved engine performance by maintaining optimal crankcase pressure and cleanliness. This can lead to extended component life, as the engine operates in a more controlled environment. Additionally, the breather enhances the reliability of the engine by reducing the risk of pressure-related issues and contaminant buildup.

Installation and Integration

Proper installation of the 3684740 Breather, Crankcase is essential for ensuring its effective operation. It is designed to be compatible with a range of Cummins engine models, facilitating easy integration into the engine system. During installation, it is important to follow manufacturer guidelines to ensure that the breather is securely fitted and properly aligned with the crankcase ventilation system.

Maintenance and Troubleshooting

Regular maintenance of the 3684740 Breather, Crankcase is essential for ensuring its continued effective operation. This includes periodic inspections to check for signs of wear or damage. Common issues that may arise include blockages or leaks, which can be addressed by cleaning or replacing the breather as necessary. Periodic replacements are recommended to prevent potential issues related to aging or degradation of the component.

Performance Impact

The 3684740 Breather, Crankcase contributes to overall engine performance by maintaining a stable crankcase environment. This can have a positive effect on fuel efficiency, as the engine operates more smoothly and with reduced friction. Additionally, proper ventilation can help in reducing emissions by preventing the release of unburned hydrocarbons into the atmosphere. The breather also plays a role in enhancing engine longevity by protecting components from the adverse effects of pressure and contaminants.

Cummins Overview

Cummins Inc. is a well-established manufacturer in the commercial truck industry, known for its commitment to quality and innovation in engine components. With a history of producing reliable and high-performance engines, Cummins has built a reputation for excellence. The company’s product range includes a variety of engine components designed to meet the demanding requirements of commercial trucking, with a focus on durability, efficiency, and reliability.

Engine Compatibility with Part 3684740

The BREATHER, CRANKCASE part 3684740, manufactured by Cummins, is designed to fit seamlessly into several of the listed engines. This part is integral to the engine’s ventilation system, ensuring proper airflow and pressure management within the crankcase.

GTA855 CM558 (CM2358) G101

This engine model benefits from the BREATHER, CRANKCASE part 3684740, which is specifically engineered to maintain optimal crankcase pressure and prevent oil contamination. The fitment ensures that the engine operates efficiently and reliably.

QSK60 CM850 MCRS, QSK60 G CM2358 K110

For the QSK60 series engines, including the CM850 MCRS and G CM2358 K110 variants, the BREATHER, CRANKCASE part 3684740 plays a significant role in managing the crankcase ventilation system. This part ensures that the engine’s crankcase remains at the correct pressure levels, preventing oil leaks and maintaining engine longevity.

The compatibility of this part across these engines highlights its versatility and importance in maintaining engine health and performance.

Role of Part 3684740 BREATHER,CRANKCASE in Engine Systems

In the intricate arrangement of an engine system, the BREATHER, CRANKCASE part 3684740 assumes a significant role by facilitating the proper ventilation of the crankcase. This component is designed to manage the pressure within the crankcase, ensuring that it remains balanced and does not exceed safe limits.

Integration with Engine Components

1. Crankcase Ventilation: The primary function of the BREATHER, CRANKCASE part 3684740 is to allow the escape of gases that accumulate within the crankcase. These gases, which include unburnt fuel, combustion byproducts, and moisture, are expelled through the breather. This process prevents the buildup of pressure, which could lead to leaks or damage to seals and gaskets ².

2. Breather Arrangement: In conjunction with other breather components, the BREATHER, CRANKCASE part 3684740 forms part of a comprehensive breather arrangement. This setup typically includes intake and outlet breathers, PCV (Positive Crankcase Ventilation) valves, and associated hoses and tubes. The breather arrangement works in harmony to ensure a continuous flow of fresh air into the crankcase while expelling contaminated air.

3. Pressure Regulation: By allowing the controlled release of gases, the BREATHER, CRANKCASE part 3684740 helps in regulating the internal pressure of the crankcase. This regulation is essential for maintaining the integrity of the engine’s moving parts, such as the crankshaft, connecting rods, and pistons, which operate within the crankcase.

4. Moisture Management: The breather also plays a role in managing moisture within the crankcase. Condensation can form due to temperature variations and the presence of combustion byproducts. The BREATHER, CRANKCASE part 3684740 aids in the expulsion of this moisture, reducing the risk of corrosion and sludge formation, which can impair engine performance and longevity.

5. Emission Control: In modern engine systems, the breather is often integrated with emission control systems. The expelled gases from the crankcase are directed back into the intake manifold, where they are re-burnt in the combustion chamber. This process not only reduces emissions but also improves fuel efficiency by utilizing otherwise wasted gases ³.

Conclusion

In summary, the BREATHER, CRANKCASE part 3684740 is a vital component in the engine system, contributing to the efficient operation and longevity of the engine by ensuring proper ventilation, pressure regulation, and emission control.