3948074
BREATHER,CRANKCASE
Cummins®

The BREATHER, CRANKCASE part 3948074, manufactured by Cummins, is a critical component for heavy-duty truck engines. It ensures proper ventilation within the crankcase, which is essential for engine operation and longevity ¹.

Basic Concepts of Crankcase Breathers

Crankcase breathers are designed to vent vapors and prevent pressure build-up within the crankcase. They facilitate the removal of combustion gases that enter the crankcase, ensuring balanced internal pressure. This process aids in engine lubrication by allowing fresh air to mix with the oil, helping to cool and clean it. Proper ventilation supports overall engine performance by maintaining optimal operating conditions ².

Function and Operation

This Cummins part operates by allowing airflow into and out of the crankcase. It incorporates a filtration system to trap contaminants, ensuring that only clean air enters the crankcase. The part manages crankcase pressure by venting excess gases and moisture, which helps maintain a stable environment for the engine’s moving parts ³.

Key Features

The BREATHER, CRANKCASE part 3948074 is characterized by its robust design and the use of high-quality materials. It features an efficient filtration system that captures particles and prevents them from circulating within the engine. The part is engineered to withstand the harsh conditions of heavy-duty truck operation, ensuring durability and reliable performance.

Role in Truck Operation

In heavy-duty trucks, this part plays a role in ensuring efficient engine operation. Proper crankcase ventilation supports engine efficiency by maintaining clean oil and preventing sludge formation. It also contributes to lubrication by ensuring that the oil remains in optimal condition, which reduces wear on internal components and supports engine longevity.

Benefits

Using the BREATHER, CRANKCASE part 3948074 offers several advantages. It supports improved engine performance by ensuring that the crankcase remains free of contaminants and excess pressure. This part also helps reduce wear on internal components, leading to enhanced engine durability. Additionally, proper ventilation can contribute to better fuel efficiency by maintaining optimal engine operating conditions.

Troubleshooting and Maintenance

Common issues with crankcase breathers include clogging of the filter element and leaks in the system. Regular inspection and cleaning of the breather can help prevent these problems. It is also important to check for signs of wear or damage and replace the part if necessary to ensure continued optimal performance.

Installation Considerations

When installing the BREATHER, CRANKCASE part 3948074, it is important to ensure proper positioning and sealing to prevent leaks. Compatibility with other engine components should be verified to ensure seamless integration into the engine system. Following the manufacturer’s guidelines for installation will help maintain the part’s effectiveness and durability.

Cummins Corporation

Cummins Corporation is a well-established entity in the automotive industry, known for its high-quality engine components. With a history of innovation and a commitment to excellence, Cummins has built a reputation for manufacturing reliable and durable parts that meet the demanding requirements of heavy-duty applications.

Engine Compatibility for Part 3948074

The BREATHER, CRANKCASE part 3948074, manufactured by Cummins, is designed to fit seamlessly into several engine models. This part is essential for maintaining the integrity of the crankcase ventilation system, ensuring that the engine operates efficiently and safely.

Compatible Engines

• ISC CM554
• ISL CM554
• QSC8.3 CM554
• QSL9 CM554

These engines share a common architecture that allows the BREATHER, CRANKCASE part to be interchangeable across the listed models. This compatibility ensures that users can easily find and replace the part without worrying about specific engine variations.

Grouping for Ease of Use

For ease of reference, the engines can be grouped as follows:

• ISC and ISL Series:

  • ISC CM554
  • ISL CM554

• QSC and QSL Series:

  • QSC8.3 CM554
  • QSL9 CM554

This grouping helps in understanding the broader compatibility of the part within the respective engine families.

Role of Part 3948074 Breather, Crankcase in Engine Systems

In the realm of engine systems, the breather, crankcase, denoted as part 3948074, assumes a significant role in maintaining the overall health and efficiency of the engine. This component is integral to the ventilation system of the crankcase, ensuring that the internal environment of the engine remains optimal for performance.

Ventilation and Pressure Regulation

The primary function of the breather, crankcase is to regulate the pressure within the crankcase. As the engine operates, it generates gases and vapors that need to be expelled to prevent a buildup of pressure. The breather facilitates this process by allowing these byproducts to escape, thus maintaining a stable internal pressure. This is particularly important for the proper functioning of the piston rings and the overall lubrication system.

Contamination Control

Another important aspect of the breather, crankcase is its role in contamination control. By allowing the escape of gases and vapors, it also helps in preventing the ingress of external contaminants into the crankcase. This is achieved through a one-way valve mechanism that ensures air can exit the crankcase but not enter, thereby protecting the engine’s internal components from dust, dirt, and other particulates.

Lubrication System Efficiency

The breather, crankcase contributes to the efficiency of the lubrication system. By maintaining a consistent pressure within the crankcase, it ensures that the oil circulation is not impeded. This is vital for the consistent lubrication of moving parts, which in turn reduces wear and tear and enhances the longevity of the engine.

Integration with Other Components

In a typical engine system, the breather, crankcase works in conjunction with several other components. It is often connected to the Positive Crankcase Ventilation (PCV) system, which recirculates the crankcase vapors back into the intake manifold. This not only helps in reducing emissions but also ensures that the engine operates within its designed parameters. Additionally, the breather is linked to the air intake system, allowing for a controlled exchange of air, which is essential for the engine’s combustion process.

Impact on Engine Performance

The efficient operation of the breather, crankcase has a direct impact on engine performance. By ensuring that the crankcase remains free from excessive pressure and contamination, it contributes to smoother engine operation, better fuel efficiency, and reduced emissions. Moreover, it plays a part in the overall reliability and durability of the engine, making it a component of significant importance in the engine system.

Conclusion

The BREATHER, CRANKCASE part 3948074 is a vital component in the maintenance and operation of heavy-duty truck engines. Its role in regulating crankcase pressure, controlling contamination, and ensuring efficient lubrication cannot be overstated. Proper maintenance and installation of this part are crucial for the optimal performance and longevity of the engine.