3999673
Threaded Plug
Cummins®

The Cummins 3999673 Threaded Plug is a component designed for use in commercial trucks. It serves a role in maintaining the integrity of various systems within these vehicles. Understanding its purpose and significance is key to ensuring proper truck maintenance and operation.

Basic Concepts of Threaded Plugs

Threaded plugs are mechanical components used to seal openings in automotive systems. They are screwed into place to create a secure, leak-proof seal. In automotive applications, these plugs are commonly used in fuel, oil, and coolant systems to prevent fluid leakage and maintain system pressure. The threading allows for a snug fit, ensuring that the plug remains in place under various operating conditions ¹.

Purpose of the Cummins 3999673 Threaded Plug

The Cummins 3999673 Threaded Plug is specifically designed to seal openings in truck systems, such as fuel, oil, or coolant systems. It ensures that these systems remain closed, preventing fluid leaks and maintaining the necessary pressure for optimal performance. By sealing these openings, the plug contributes to the overall efficiency and reliability of the truck’s systems ².

Key Features

The Cummins 3999673 Threaded Plug is constructed from durable materials, ensuring longevity and resistance to wear. It features a specific thread type that allows for a secure fit in the designated openings. Unique design elements may include a tapered seal or O-ring groove, enhancing its sealing capabilities and ensuring a tight fit.

Benefits

Using the Cummins 3999673 Threaded Plug offers several advantages. Its robust construction provides improved sealing capabilities, reducing the risk of leaks. The material composition ensures durability, allowing it to withstand high temperatures and resist corrosion. These features contribute to the plug’s reliability and effectiveness in demanding commercial truck applications ³.

Installation Process

Proper installation of the Cummins 3999673 Threaded Plug is crucial for ensuring a secure fit and optimal performance. The process involves cleaning the opening, applying a thread sealant if necessary, and screwing the plug into place using the appropriate tools. It is important to follow manufacturer guidelines to avoid over-tightening, which could damage the plug or the surrounding system.

Troubleshooting Common Issues

Common issues with threaded plugs include leaks and difficulty in removal. If a leak is detected, the plug should be inspected for damage or improper installation. Difficulty in removal may require the use of specialized tools or techniques to avoid damaging the plug or the system. Regular inspections can help identify and address these issues promptly.

Maintenance Tips

Regular maintenance checks are recommended to ensure the longevity and effectiveness of the Cummins 3999673 Threaded Plug. Inspection intervals should be established based on the truck’s usage and operating conditions. Signs of wear or damage, such as corrosion or thread wear, should be addressed immediately to prevent system failure.

Cummins Overview

Cummins Inc. is a leading manufacturer of diesel engines with a history of innovation and quality in the automotive industry. The company is committed to providing reliable and efficient solutions for commercial vehicles, including a wide range of components and systems designed to enhance performance and durability.

Threaded Plug 3999673 Compatibility with Cummins Engines

The Cummins Threaded Plug 3999673 is designed to fit a variety of Cummins engines, ensuring compatibility across multiple models. Here’s a detailed look at the engines with which this part is compatible:

Cummins B Series Engines

• B5.9 CM2670 B166C
• B5.9 GAS PLUS CM556
• B6.7 CM2350 B135B
• B6.7 CM2670 B153B

These engines, part of the B series, are known for their robust design and reliability. The threaded plug 3999673 fits seamlessly into these engines, providing a secure and leak-proof seal.

Cummins ISB/ISD Series Engines

• ISB/ISD4.5 CM2150 B119
• ISB/ISD6.7 CM2150 SN
• ISB5.9 CM2880 B127

The ISB/ISD series engines are widely used in various applications, from heavy-duty trucks to industrial machinery. The threaded plug 3999673 is engineered to fit these engines, ensuring optimal performance and durability.

Cummins ISBE Series Engines

• ISBE CM2150
• ISBE4 CM850

The ISBE series engines are designed for high-performance applications. The threaded plug 3999673 is compatible with these engines, providing a reliable sealing solution.

Cummins ISD Series Engines

• ISD4.5 CM2220 D108

The ISD series engines are known for their efficiency and power. The threaded plug 3999673 fits these engines, ensuring a secure and leak-proof connection.

Cummins QSB Series Engines

• QSB4.5 CM850 (CM2850)
• QSB5.9 CM2880 B139

The QSB series engines are designed for a variety of applications, from agricultural to marine. The threaded plug 3999673 is compatible with these engines, providing a dependable sealing solution.

Cummins L Series Engine

• L9 CM2670 L128B

The L series engine is known for its versatility and performance. The threaded plug 3999673 fits this engine, ensuring a secure and leak-proof seal.

This threaded plug is a component in maintaining the integrity of these engines, ensuring they operate efficiently and reliably.

Role of Part 3999673 Threaded Plug in Engine Systems

In the context of engine systems, the 3999673 Threaded Plug is instrumental in ensuring the integrity and efficiency of various components.

Connection Systems

Within connection systems, the 3999673 Threaded Plug serves to seal and secure joints where different sections of the engine meet. This is particularly important in high-pressure environments where any leakage could lead to significant performance issues. The plug’s design allows it to withstand substantial force, maintaining a tight seal that prevents fluid or gas escape. This ensures that the connection remains robust and reliable under operating conditions.

Water Inlet Systems

In water inlet systems, the 3999673 Threaded Plug plays a key role in regulating the flow of coolant into the engine. By fitting securely into designated ports, it helps maintain the correct pressure and flow rate of the coolant. This is essential for optimal engine temperature management, which in turn affects overall engine performance and longevity. The plug’s precise threading ensures a snug fit, minimizing the risk of coolant leaks that could otherwise lead to overheating or corrosion within the engine block.

Conclusion

The Cummins 3999673 Threaded Plug is a vital component in the maintenance and operation of commercial trucks. Its robust construction, compatibility with various Cummins engines, and role in sealing critical systems make it an essential part for ensuring the efficiency and reliability of truck engines. Regular maintenance and proper installation are key to maximizing the benefits of this Cummins part.