3936904
Rear Cover
Cummins®

The Cummins 3936904 Rear Cover is a critical component designed for use in heavy-duty truck engines. It serves a specific function within the engine assembly, contributing to the overall performance and longevity of the engine. Understanding its purpose and significance is fundamental for maintaining and optimizing the operation of heavy-duty trucks.

Purpose and Function

The 3936904 Rear Cover plays a role in the engine assembly by providing a protective enclosure for the rear section of the engine. It helps in containing engine oil, safeguarding internal components from external contaminants, and contributing to the structural integrity of the engine. By ensuring that the rear section of the engine is sealed and protected, this cover aids in maintaining the efficiency and reliability of the engine’s operation ¹.

Key Features

The design and construction of the 3936904 Rear Cover incorporate several features that enhance its performance. It is typically made from durable materials that can withstand the high temperatures and pressures within an engine environment. The cover includes precise sealing mechanisms to ensure a tight fit, preventing oil leaks and the ingress of dirt and debris. Unique design elements may also be present to facilitate easier installation and maintenance, as well as to improve the overall efficiency of the engine ².

Benefits

The advantages provided by the 3936904 Rear Cover include improved engine protection, which leads to enhanced durability and longevity of the engine components. It contributes to efficient engine operation by maintaining optimal oil levels and preventing contamination. The cover’s robust construction ensures it can endure the demanding conditions of heavy-duty truck applications, offering reliable performance over time.

Installation Process

Proper installation of the 3936904 Rear Cover involves several steps to ensure optimal performance. It begins with preparing the engine area, ensuring it is clean and free from debris. The cover should be aligned correctly with the engine’s rear section, followed by securing it in place using the appropriate fasteners. Attention to detail during installation is crucial to achieve a proper seal and ensure the cover functions as intended.

Maintenance and Troubleshooting

Regular maintenance practices for the 3936904 Rear Cover include inspecting the sealing mechanisms for wear or damage, ensuring the cover remains securely fastened, and checking for any signs of oil leaks. Common issues may involve seal degradation or fastener loosening, which can be addressed by replacing worn seals or tightening fasteners as necessary. Proactive maintenance helps prolong the lifespan of the cover and ensures continued efficient engine operation.

Compatibility and Applications

The 3936904 Rear Cover is designed for specific truck models and engine types, ensuring compatibility and optimal performance within those applications. Its use in various heavy-duty truck configurations demonstrates its versatility and the importance of selecting the correct component for the intended application.

Manufacturer - Cummins

Cummins Inc. is a renowned manufacturer in the automotive industry, known for its high-quality engine components. With a history of innovation and commitment to excellence, Cummins has established a reputation for producing reliable and durable parts that meet the demanding requirements of heavy-duty applications. The company’s dedication to quality and performance is evident in its wide range of engine components, including the 3936904 Rear Cover.

Compatibility with Cummins Engines

The Rear Cover part 3936904 by Cummins is designed to fit a variety of Cummins engines, ensuring a secure and reliable seal at the rear of the engine. This part is critical for maintaining engine integrity and performance. Below is a detailed look at its compatibility with various Cummins engine models:

4B3.9 and 6B5.9 Engines

The Rear Cover part 3936904 is compatible with the 4B3.9 and 6B5.9 engines. These engines are part of the B Series family, known for their robust construction and reliability in heavy-duty applications. The rear cover ensures that the engine’s internal components are protected from external contaminants, maintaining optimal performance and longevity.

B5.9 CM2670 B166C and B5.9 GAS PLUS CM556

For the B5.9 CM2670 B166C and B5.9 GAS PLUS CM556 engines, the Rear Cover part 3936904 provides a precise fit. These engines are designed for both diesel and gas applications, offering flexibility in various industrial settings. The rear cover’s role is crucial in preventing leaks and ensuring that the engine operates efficiently under different fuel types.

ISB3.9 CM2220 B107 and ISB5.9 CM2880 B127

The Rear Cover part 3936904 is also suitable for the ISB3.9 CM2220 B107 and ISB5.9 CM2880 B127 engines. These engines belong to the ISB Series, which is renowned for its power and reliability in on-highway and vocational applications. The rear cover’s design ensures a tight seal, protecting the engine from debris and moisture, which is essential for maintaining peak performance.

QSB3.9 CM2880 B138 and QSB5.9 CM2880 B139

Lastly, the Rear Cover part 3936904 fits the QSB3.9 CM2880 B138 and QSB5.9 CM2880 B139 engines. These engines are part of the QSB Series, designed for off-highway applications where durability and performance are paramount. The rear cover’s compatibility with these engines ensures that the engine remains sealed and protected, even in the most demanding conditions.

By ensuring a proper fit with these various engine models, the Rear Cover part 3936904 plays a vital role in maintaining the overall health and efficiency of Cummins engines across different applications.

Role of Part 3936904 Rear Cover in Engine Systems

The part 3936904 Rear Cover is an integral component in the assembly and operation of various engine systems. It interfaces directly with the flywheel housing, providing a sealed enclosure that protects internal components from contaminants and ensures the integrity of the engine’s operating environment.

Interaction with Flywheel Housing

The Rear Cover fits snugly against the flywheel housing, creating a barrier that prevents the ingress of dirt, moisture, and other debris. This seal is essential for maintaining the cleanliness of the internal components, such as the crankshaft, bearings, and other moving parts. The Rear Cover also assists in managing the thermal environment around the flywheel, contributing to the overall efficiency and reliability of the engine.

Structural Support and Alignment

Beyond its sealing function, the Rear Cover plays a role in the structural support of the engine. It helps in aligning the flywheel housing with other components, ensuring that the engine operates smoothly without undue stress on any single part. This alignment is vital for the precise operation of the engine, particularly in high-performance applications where even minor misalignments can lead to significant issues.

Contribution to Lubrication System

The Rear Cover also interacts with the engine’s lubrication system. It houses passages and channels that facilitate the flow of lubricant to critical areas, such as the crankshaft and main bearings. This ensures that these components receive a consistent supply of oil, reducing friction and wear over time. The design of the Rear Cover must therefore accommodate the lubrication system’s requirements, including oil feed lines and return paths.

Integration with Other Components

In addition to the flywheel housing, the Rear Cover may also interface with other components such as the rear main seal, which further enhances the engine’s sealing capabilities. It may also provide mounting points for additional accessories or sensors, depending on the specific engine design. This multifaceted role underscores the importance of the Rear Cover in the overall functionality of the engine system.

Conclusion

The Cummins 3936904 Rear Cover is a vital component in the maintenance and operation of heavy-duty truck engines. Its role in protecting internal components, contributing to structural integrity, and ensuring efficient engine operation cannot be overstated. Proper installation, regular maintenance, and understanding its compatibility with various Cummins engines are essential for maximizing the performance and longevity of the engine.