4017621
Expansion Plug
Cummins®

Introduction

The Expansion Plug 4017621 is a critical component manufactured by Cummins, a leader in the automotive and heavy-duty truck industry. This part is essential for maintaining the integrity of various systems within commercial trucks.

Basic Concepts of Expansion Plugs

An expansion plug is a mechanical device designed to seal openings in systems where pressure or temperature variations occur. It expands under specific conditions to create a tight seal, preventing leaks and maintaining system efficiency. Expansion plugs are commonly used in engines, cooling systems, and other areas requiring fluid or gas containment ¹.

Role of the 4017621 Expansion Plug in Truck Operation

The 4017621 Expansion Plug is vital for sealing specific points within the engine or cooling system. Its placement is crucial in areas where system pressure or temperature changes could lead to leaks if not properly sealed. The plug provides a reliable seal that helps maintain system pressure and prevent fluid loss, contributing to the overall efficiency and reliability of the truck’s operation ².

Key Features

The 4017621 Expansion Plug is made from high-quality metal alloys, offering durability and corrosion resistance. Its design includes a threaded body for easy installation and removal, and a spring-loaded mechanism that ensures the plug expands to fill the space it is designed to seal. These features contribute to its effectiveness in sealing applications and its longevity in demanding environments.

Benefits

The use of the 4017621 Expansion Plug offers several benefits, including improved system performance through reliable sealing, enhanced durability due to its material and design, and cost-effectiveness by reducing the need for frequent replacements or repairs. Its ability to maintain system integrity under varying conditions contributes to the overall efficiency and reliability of the truck.

Troubleshooting and Maintenance

Common issues with expansion plugs include leaks due to wear or improper installation. Troubleshooting steps involve inspecting the plug for damage or corrosion, ensuring it is correctly installed, and replacing it if necessary. Regular maintenance practices, such as checking for proper seating and condition during routine inspections, can help ensure the longevity and proper function of the 4017621 Expansion Plug.

About Cummins

Cummins is a renowned manufacturer in the automotive and heavy-duty truck industry, known for its commitment to producing high-quality components. With a strong reputation for reliability and innovation, Cummins continues to be a trusted name among professionals in the field, offering a wide range of products designed to meet the demanding requirements of commercial vehicles.

Compatibility of Expansion Plug 4017621 with Cummins Engines

The Expansion Plug 4017621 is designed to fit a variety of Cummins engines, ensuring a secure and reliable seal. This part is crucial for maintaining the integrity of the engine’s cooling system. Below is a detailed description of its compatibility with the listed engines:

GTA38 G CMEICS G116C, K38, K50, KTA38GC CM558

The Expansion Plug 4017621 is compatible with these engines, ensuring that the cooling system remains sealed and efficient, preventing any coolant leaks that could compromise engine performance.

QSK38 CM2150 MCRS, QSK38 CM850 MCRS, QSK45 CM500

The plug fits seamlessly with these engines, maintaining the cooling system’s pressure and preventing coolant from escaping, which could lead to overheating and engine damage.

QSK50 CM2150 K107, QSK50 CM2150 MCRS, QSK50 CM2350 K108

The Expansion Plug 4017621 is suitable for these engines, ensuring that the cooling system remains intact, providing the necessary protection against leaks and maintaining optimal engine temperature.

QSK60 CM500, QSK60 CM850 MCRS, QSK60 G CM2358 K110, QSK60G

This plug fits these engines, ensuring a proper seal to prevent any coolant loss, which could result in overheating and potential engine failure.

QSK78 CM500, QSK95 CM2350 K111, QSK95 CM2350 K113

The Expansion Plug 4017621 is compatible with these engines, ensuring that the cooling system is properly sealed, preventing leaks and maintaining the engine’s operational efficiency.

Role of Part 4017621 Expansion Plug in Engine Systems

In engine systems, the 4017621 Expansion Plug is integral to maintaining the structural integrity and operational efficiency of various components. Here’s how it interfaces with different engine assemblies and parts:

Short Block Assemblies

The 4017621 Expansion Plug is utilized in Short Block Assemblies such as the K50G3 and K38 variants. In these assemblies, the plug ensures that the cylinder block remains sealed, preventing any unwanted fluid or gas leakage that could compromise engine performance.

Base Components

When integrated into Base Parts and Base Assemblies, the expansion plug plays a role in securing the Block Cylinder Kit and Block Kit. This is essential for maintaining the precision fit of the Crankshaft and Bearings within the Cylinder Block.

Cylinder Block and Related Kits

In the Cylinder Block Hardware Kit and Cylinder Block Kit, the 4017621 Expansion Plug aids in the proper alignment and sealing of the Cylinder Short Block. This ensures that the Gear Housing and other interconnected components function smoothly without interference from external elements.

Long Block Assembly

For the Long Block Assy. - 50, the expansion plug is critical in the Lower Block Gasket Set to maintain the integrity of the Plumbing and Oil Replenishing System. This is vital for consistent lubrication and cooling, which are paramount for engine longevity.

Service and Overhaul Kits

In Service Block Kits and HHP Ovhl Lw Block GSK, the 4017621 Expansion Plug is employed to ensure that all Base Parts are correctly sealed. This is particularly important during engine overhauls where maintaining a leak-free environment is essential for successful reassembly and operation.

Plumbing and Oil Systems

The plug also finds its application in the Plumbing associated with the Cylinder Block. Here, it ensures that the Oil Replenishing System operates efficiently, without any risk of oil leakage that could lead to engine damage.

Conclusion

The 4017621 Expansion Plug is a versatile and essential component that enhances the functionality and reliability of various engine systems by ensuring proper sealing and alignment across a wide range of assemblies and kits. Its compatibility with a variety of Cummins engines underscores its importance in maintaining the integrity of the cooling system and overall engine performance.