4938771
BREATHER,CRANKCASE
Cummins®

The BREATHER, CRANKCASE part number 4938771, manufactured by Cummins, is a vital component designed to facilitate the ventilation of the crankcase in commercial trucks. Its role is significant in maintaining the engine’s operational efficiency and longevity. This part ensures that the crankcase remains properly ventilated, which is essential for the engine’s performance.

Basic Concepts of Crankcase Breathers

A crankcase breather is a device that allows air to enter and exit the crankcase of an engine. Its function is to manage the pressure within the crankcase by allowing gases produced during combustion to escape. Proper ventilation is crucial to prevent the buildup of pressure and contaminants, which can lead to engine damage. The breather also helps in maintaining a clean oil supply by allowing the escape of gases that could otherwise mix with the oil ².

Purpose and Role in Truck Operation

The BREATHER, CRANKCASE part number 4938771 plays a specific role in the operation of a truck by ensuring that the crankcase is properly ventilated. This ventilation is important for maintaining engine performance and longevity. By allowing gases to escape, the breather helps in reducing the pressure within the crankcase, which can otherwise lead to oil leaks and engine wear. Additionally, it contributes to keeping the engine oil clean, which is essential for the engine’s overall efficiency ³.

Key Features

The BREATHER, CRANKCASE part number 4938771 is designed with several key features that enhance its functionality. It is constructed from durable materials to withstand the harsh conditions within the engine compartment. The design includes filters to trap contaminants, ensuring that only clean air enters the crankcase. Additionally, the part is engineered to fit securely within the engine system, providing a reliable seal that prevents leaks.

Benefits

Using the BREATHER, CRANKCASE part number 4938771 offers several benefits. It contributes to improved engine efficiency by ensuring proper ventilation and clean oil. Reduced wear and tear on engine components is another advantage, as the breather helps in maintaining optimal pressure levels within the crankcase. Enhanced overall performance of the engine is also a result of the breather’s role in keeping the crankcase environment stable and clean ¹.

Troubleshooting and Maintenance

Common issues with the BREATHER, CRANKCASE part number 4938771 may include clogging of the filter or leaks due to wear and tear. Troubleshooting steps involve checking the filter for blockages and ensuring the part is securely fitted. Regular maintenance practices include inspecting the breather for signs of damage and replacing it if necessary to ensure optimal performance.

Installation and Replacement

Proper installation and replacement of the BREATHER, CRANKCASE part number 4938771 require attention to detail. The process involves removing the old part, inspecting the fitting area for any damage, and installing the new breather securely. Tools required may include wrenches and possibly a seal kit. Safety precautions to observe include ensuring the engine is cool before beginning work and following manufacturer guidelines for installation.

Cummins 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 a reputation for quality and innovation in the automotive industry. The company’s product offerings include a wide range of engines and components designed for various applications, demonstrating its commitment to excellence and customer satisfaction.

Crankcase Breather Fitment for Cummins Engines

The BREATHER, CRANKCASE part number 4938771, manufactured by Cummins, is a critical component in the engine’s ventilation system. This part is designed to fit seamlessly with several Cummins engine models, ensuring proper airflow and pressure management within the crankcase. Below is a detailed overview of the engines that this part is compatible with:

• B6.7 CM2670 B153B
• ISB/ISD4.5 CM2150 B119
• ISB/ISD6.7 CM2150 SN
• ISBE CM2150
• ISBE CM800
• ISBE4 CM850
• QSB6.7 CM850 (CM2850)
• QSB7 CM2880 B117

This breather plays a pivotal role in maintaining the integrity of the engine’s crankcase by allowing the escape of gases and preventing the buildup of pressure. It is essential for the longevity and efficiency of the engine, ensuring that the crankcase remains at optimal pressure levels.

Role of Part 4938771 Breather, Crankcase in Engine Systems

The part 4938771, specifically designed as a breather for the crankcase, is integral to maintaining the health and efficiency of the engine system. This component is strategically positioned to interact with several key engine components, ensuring optimal performance and longevity.

Interaction with the Crankcase

The primary function of the 4938771 breather is to regulate the pressure within the crankcase. As the engine operates, it generates gases and vapors that need to be managed to prevent buildup. The breather allows these byproducts to escape, maintaining a stable pressure environment. This is essential for the proper lubrication of moving parts within the crankcase, as excessive pressure can lead to oil leaks and reduced efficiency ².

Coordination with the Flywheel Housing Kit

When integrated with a flywheel housing kit, the 4938771 breather plays a supportive role in managing the overall pressure dynamics of the engine. The flywheel housing kit encompasses components like the flywheel, clutch, and associated mounts. Efficient pressure management within the crankcase, facilitated by the breather, ensures that these components operate under optimal conditions. This synergy helps in maintaining the balance and performance of the flywheel system, which is vital for smooth power transmission from the engine to the transmission system.

Enhanced Engine Performance

By effectively ventilating the crankcase, the 4938771 breather contributes to the reduction of contaminants within the engine oil. This is particularly important in high-performance engines where the integrity of the oil is paramount for lubrication and cooling. The breather helps in expelling moisture and other impurities, thus prolonging the life of the oil and enhancing engine performance ³.

Support for Overall Engine Health

Incorporating the 4938771 breather into the engine system not only aids in pressure regulation but also supports the overall health of the engine. By preventing the accumulation of gases and contaminants, it reduces the risk of engine wear and potential failures. This component is a silent yet significant contributor to the durability and reliability of the engine, working in concert with other components to ensure a seamless and efficient operation.

Conclusion

The BREATHER, CRANKCASE part number 4938771 by Cummins is a critical component in maintaining the efficiency and longevity of commercial truck engines. Its role in regulating crankcase pressure, coordinating with other engine components, and enhancing overall engine performance underscores its importance in engine systems. Regular maintenance and proper installation are essential to ensure the optimal functioning of this part.