3936641
Pipe Plug
Cummins®

The Cummins 3936641 Pipe Plug is a component designed for use in commercial trucks, playing a role in maintaining the integrity of fluid systems within these vehicles. This part is part of Cummins Inc.’s extensive lineup of automotive components, a manufacturer renowned for its commitment to quality and innovation in the commercial truck industry.

Basic Concepts of Pipe Plugs

A pipe plug is a device used to seal the end of a pipe or a fluid passage, preventing the escape of fluids or gases. It operates by fitting snugly into the pipe’s end, creating a barrier that maintains system pressure and prevents leaks. Pipe plugs are commonly manufactured from materials such as brass, steel, or plastic, each offering distinct properties like corrosion resistance, durability, and ease of installation ¹.

Purpose of the Cummins 3936641 Pipe Plug

The Cummins 3936641 Pipe Plug is specifically designed to seal off unused ports or ends in the fluid systems of commercial trucks. By doing so, it helps maintain the system’s pressure and ensures that fluids are directed only through the intended pathways. This plug is associated with various systems or components within the truck, contributing to their efficient operation by preventing fluid loss and maintaining system integrity ².

Key Features

The Cummins 3936641 Pipe Plug features a design that ensures a secure fit within the pipe or fluid passage it is intended to seal. It is composed of materials that offer durability and resistance to the corrosive effects of the fluids it encounters. Unique characteristics of this plug may include a threaded design for easy installation and removal, and a composition that ensures compatibility with the specific fluids and pressures within the truck’s system.

Benefits

Utilizing the Cummins 3936641 Pipe Plug offers several advantages, including improved system integrity through effective sealing, enhanced performance of the fluid systems by preventing leaks, and increased longevity of the system components due to reduced wear and tear from fluid loss. These benefits contribute to the overall efficiency and reliability of the truck, ensuring that it operates at optimal levels ³.

Installation Considerations

When installing the Cummins 3936641 Pipe Plug, it is important to follow guidelines and best practices to ensure a secure fit. This includes adhering to proper torque specifications to avoid over-tightening, which could damage the plug or the pipe, and using appropriate sealing methods to prevent leaks. Preparatory steps, such as cleaning the pipe end and inspecting the plug for any defects, are also crucial for a successful installation.

Troubleshooting and Maintenance

Common issues with pipe plugs include leaks due to improper installation or wear over time. Identifying these issues involves inspecting the plug and the surrounding area for signs of fluid escape. Maintenance and replacement of the Cummins 3936641 Pipe Plug should be performed according to the manufacturer’s guidelines to ensure continued system integrity. Regular inspections and adhering to maintenance schedules can help prevent common problems and extend the lifespan of the component.

Cummins as a Manufacturer

Cummins Inc. is a leading manufacturer in the commercial truck industry, known for its history of innovation and commitment to quality. The company’s product lineup includes a wide range of components and technologies designed to enhance the performance and reliability of commercial vehicles. Cummins’ dedication to customer satisfaction is evident in their comprehensive support and service offerings, making them a trusted name in the industry.

Cummins Engine Pipe Plug 3936641 Compatibility

The Cummins Pipe Plug part number 3936641 is designed to fit a variety of Cummins engine models. This part is essential for maintaining the integrity of the engine’s exhaust system, ensuring that it operates efficiently and safely. Below is a detailed breakdown of the engine models that this pipe plug is compatible with:

• 4B3.9 and 6B5.9 Engines: The 4B3.9 and 6B5.9 engines are part of the B Series family, known for their robust performance and reliability. The pipe plug 3936641 fits seamlessly into these engines, ensuring a secure connection in the exhaust system.
• B5.6 CM2670 B152B and B5.9 GAS PLUS CM556: These engines, B5.6 CM2670 B152B and B5.9 GAS PLUS CM556, are equipped with the pipe plug 3936641 to maintain the exhaust system’s structural integrity. This part is crucial for preventing leaks and ensuring optimal engine performance.
• B6.7 CM2670 B153B: The B6.7 CM2670 B153B engine also utilizes the pipe plug 3936641. This part is designed to fit perfectly, ensuring that the exhaust system remains sealed and efficient.
• ISB5.9 CM2880 Series: The ISB5.9 CM2880 series includes several models: B110, B140, B149, and ISB5.9G CM2180. The pipe plug 3936641 is compatible with all these variants, providing a reliable seal in the exhaust system.
• L8.9 L121: The L8.9 L121 engine is another model that fits the pipe plug 3936641. This part ensures that the exhaust system remains intact, contributing to the engine’s overall efficiency and performance.
• QSB5.9 CM2880 B115 and QSB5.9G: The QSB5.9 CM2880 B115 and QSB5.9G engines are designed to use the pipe plug 3936641. This part is essential for maintaining the exhaust system’s integrity, ensuring that the engine operates at peak efficiency.
• QST30 CM552: The QST30 CM552 engine also requires the pipe plug 3936641. This part is crucial for ensuring that the exhaust system remains sealed and efficient.
• V903: Lastly, the V903 engine is compatible with the pipe plug 3936641. This part ensures that the exhaust system remains intact, contributing to the engine’s overall efficiency and performance.

By ensuring that the pipe plug 3936641 is correctly installed, engine owners can maintain the integrity of their exhaust systems, leading to improved performance and longevity of their engines.

Role of Part 3936641 Pipe Plug in Engine Systems

The 3936641 Pipe Plug is an essential component in various engine systems, ensuring the integrity and efficiency of fluid pathways. Here’s how it integrates with different components:

Compressor Coolant Arrangement

In the compressor coolant arrangement, the 3936641 Pipe Plug seals off unused coolant passages, preventing leaks and maintaining system pressure. This ensures the compressor operates within optimal temperature ranges, enhancing performance and longevity.

Turbocharger System

Within the turbocharger system, the Pipe Plug is used to block off unnecessary oil passages. This helps in directing the lubricant flow to critical areas, ensuring the turbocharger bearings and seals receive adequate lubrication, thus reducing wear and improving efficiency.

Cylinder Block and Cylinder Head

In the cylinder block and cylinder head, the 3936641 Pipe Plug is employed to seal off coolant or oil passages that are not in use. This prevents fluid mixing and maintains the correct flow paths, which is vital for consistent engine temperature and pressure regulation.

Air Intake Manifold and Connection

For the air intake manifold and its connections, the Pipe Plug ensures that air pathways remain unobstructed and sealed where necessary. This contributes to maintaining the correct air-fuel mixture, which is essential for combustion efficiency and engine performance.

Lubricating Oil Filter and Support

In the lubricating oil filter and support system, the Pipe Plug is used to close off oil passages that are not required, ensuring that the oil filter receives a consistent flow of clean oil. This is important for the filter’s effectiveness in removing contaminants and maintaining oil quality.

Thermostat Housing and Water Inlet Connection

The Pipe Plug plays a role in the thermostat housing and water inlet connection by sealing off coolant passages that are not in use. This helps in regulating the flow of coolant to the engine block and cylinder head, ensuring even temperature distribution and efficient cooling.

Engine Installation Kit

During engine installation, the 3936641 Pipe Plug is often used to temporarily seal off fluid passages until all components are correctly installed and connected. This prevents fluid leaks during the installation process and ensures a clean working environment.

Cylinder Head (Change) Assembly

In the cylinder head (change) assembly, the Pipe Plug is utilized to seal off coolant or oil passages that are not part of the new configuration. This ensures that the new cylinder head operates efficiently without fluid leaks or incorrect flow paths.

By effectively sealing off unnecessary passages and ensuring proper fluid flow, the 3936641 Pipe Plug contributes to the overall reliability and performance of engine systems.

Conclusion

The Cummins 3936641 Pipe Plug is a critical component in maintaining the integrity and efficiency of fluid systems in commercial trucks. Its role in sealing off unused passages, preventing leaks, and ensuring proper fluid flow is essential for the optimal operation of various engine systems. Proper installation, maintenance, and understanding of its compatibility with different Cummins engine models are key to leveraging the full benefits of this part.