3944797
BREATHER,CRANKCASE
Cummins®

The BREATHER, CRANKCASE part number 3944797 is a component manufactured by Cummins, a well-established name in the commercial truck industry. This breather is designed specifically for use in commercial trucks, where it plays a role in maintaining engine health and performance.

Basic Concepts of Crankcase Breathers

A crankcase breather is a device that allows air to escape from the crankcase of an engine. As the engine operates, it produces gases and vapors that accumulate in the crankcase. If these gases are not expelled, they can lead to increased pressure, which may cause oil leaks and other engine issues. The breather facilitates the release of these gases, ensuring that the crankcase remains at a stable pressure. Proper ventilation is vital for the longevity and efficiency of the engine ¹.

Role and Function of BREATHER, CRANKCASE 3944797

The BREATHER, CRANKCASE 3944797 is engineered to manage the pressure within the crankcase of a truck engine effectively. It expels contaminants and gases that accumulate during engine operation. By maintaining a balanced pressure and removing impurities, it contributes to the smooth operation of the engine and helps in preserving the integrity of the engine oil ².

Key Features

The BREATHER, CRANKCASE 3944797 is characterized by several design elements and materials that enhance its performance and durability. It is constructed from high-quality materials to withstand the harsh conditions of commercial truck engines. Its design includes features that maximize efficiency in expelling gases and contaminants, ensuring that the crankcase remains clean and operates under optimal conditions.

Benefits

Utilizing the BREATHER, CRANKCASE 3944797 can lead to several advantages. It contributes to improved engine performance by ensuring that the crankcase operates under the correct pressure and is free from contaminants. This can extend the engine’s life by reducing wear and tear. Additionally, it may reduce maintenance requirements, as a well-maintained crankcase is less likely to suffer from oil leaks and other issues ³.

Troubleshooting and Maintenance

Common issues with crankcase breathers can include blockages or damage to the breather, which can lead to increased crankcase pressure and potential engine problems. Regular inspection and cleaning of the breather can help prevent these issues. If problems are detected, it is important to address them promptly to avoid more significant engine damage. Maintenance practices should include checking for signs of wear, ensuring that the breather is securely installed, and cleaning or replacing it as necessary.

Compatible Engines

• 4B3.9: This engine benefits from the BREATHER, CRANKCASE part 3944797, which helps in maintaining the integrity of the crankcase environment.
• 6B5.9: Similarly, the 6B5.9 engine relies on this breather component to ensure effective ventilation and pressure management within the crankcase.
• ISB CM550: The ISB CM550 engine incorporates this breather part to facilitate proper air circulation and pressure relief, contributing to the engine’s longevity and efficiency.
• ISL G CM2180: The ISL G CM2180 engine is another beneficiary of the 3944797 breather, which aids in managing the crankcase’s internal pressure and preventing contamination.
• ISX CM570: The ISX CM570 engine also utilizes this breather part to ensure that the crankcase remains adequately ventilated, thus supporting the engine’s operational integrity.
• QSB5.9 44 CM550: Finally, the QSB5.9 44 CM550 engine integrates the 3944797 breather to maintain optimal crankcase conditions, enhancing overall engine performance and reliability.

Each of these engines, despite their differences in size and application, shares a common need for effective crankcase ventilation. This Cummins part addresses this need by providing a reliable and efficient breather solution, ensuring that the engines operate smoothly and efficiently.

Role of Part 3944797 BREATHER,CRANKCASE in Engine Systems

The BREATHER, CRANKCASE 3944797 is a component in maintaining the health and efficiency of an engine system. Its primary function is to regulate the pressure within the crankcase by allowing air and gases to escape, thus preventing the buildup of harmful pressure that could lead to oil leaks or engine damage.

Integration with Engine Components

1. Cylinder Block: The crankcase breather is typically mounted on the cylinder block. It works in conjunction with the block to manage the ventilation of the crankcase. As the engine operates, the pistons move up and down, creating pressure within the crankcase. The breather allows this pressure to be released in a controlled manner, ensuring that the cylinder block remains sealed and operates efficiently.

2. Cover: Often, the breather is integrated into the engine cover. This cover protects the internal components while allowing the breather to perform its function. The design of the cover usually includes passages or ports that connect to the breather, facilitating the flow of gases from the crankcase to the atmosphere or back into the intake system.

3. Breather Kit: In many engine systems, the BREATHER, CRANKCASE 3944797 is part of a larger breather kit. This kit may include additional components such as hoses, filters, and valves that work together to ensure optimal crankcase ventilation. The breather kit is designed to enhance the engine’s performance by maintaining a balanced pressure within the crankcase.

4. Oil Fill: The breather is also connected to the oil fill system. As the engine runs, some oil vapor and gases are produced. The breather helps in venting these vapors, which may otherwise contaminate the oil or cause foaming, leading to inefficient lubrication. By maintaining a clean and stable oil environment, the breather contributes to the longevity and reliability of the engine.

5. Arrangement: The overall arrangement of the engine components is designed to ensure that the breather operates effectively. This includes the positioning of the breather in relation to the cylinder block, cover, and oil fill system. Proper arrangement ensures that the breather can efficiently vent gases while preventing the ingress of contaminants into the crankcase.

Conclusion

In summary, the BREATHER, CRANKCASE 3944797 plays a role in the ventilation and pressure management of the engine system. Its integration with the cylinder block, cover, breather kit, and oil fill system ensures that the engine operates smoothly and efficiently.