3911679
Oil Filler Connection
Cummins®

The Cummins 3911679 Oil Filler Necktube is a component designed for use in heavy-duty trucks. Its purpose is to facilitate the addition of oil to the engine, ensuring that the lubrication system functions correctly. This part plays a role in maintaining the engine’s performance and longevity by allowing for easy and efficient oil changes and top-ups.

Basic Concepts of Oil Filler Necktubes

An oil filler necktube is a conduit through which oil is added to an engine’s lubrication system. It is typically located on the engine block or the oil pan and is connected to the oil cap. The primary function of the oil filler necktube is to provide a pathway for oil to enter the engine, ensuring that the lubrication system remains adequately filled. These components are generally made from durable materials such as metal or high-strength plastic to withstand the pressures and temperatures within the engine compartment ¹.

Purpose and Role in Truck Operation

The Cummins 3911679 Oil Filler Necktube is specifically designed to play a role in the operation of heavy-duty trucks. It allows for the convenient addition of oil to the engine, which is important for maintaining proper lubrication levels. Adequate lubrication reduces friction between moving parts, which in turn helps to prevent wear and tear, ensuring the engine operates smoothly and efficiently. The necktube is engineered to fit securely, preventing leaks and ensuring that oil is directed precisely where it is needed within the engine.

Key Features

The Cummins 3911679 Oil Filler Necktube boasts several key features that enhance its performance and durability. Its design is tailored to fit specific heavy-duty truck engines, ensuring a precise fit and function. The material composition is robust, typically featuring high-strength alloys that can endure the harsh conditions of the engine environment. Additionally, the necktube may include features such as reinforced seals or gaskets to prevent oil leaks, ensuring that the lubrication system remains intact.

Benefits

Using the Cummins 3911679 Oil Filler Necktube offers several benefits. It contributes to improved engine performance by ensuring that the lubrication system is maintained at optimal levels. The durable construction of the necktube enhances its longevity, reducing the need for frequent replacements. Furthermore, its design simplifies the oil change process, making it easier for maintenance personnel to perform routine checks and top-ups, thus saving time and effort.

Installation Process

Installing the Cummins 3911679 Oil Filler Necktube involves several steps to ensure proper fitting and function. Begin by ensuring the engine is cool and the oil has been drained. Locate the existing oil filler necktube and remove it using the appropriate tools. Carefully align the new Cummins necktube with the engine block or oil pan and secure it in place. Ensure all connections are tight and that there are no gaps or leaks. Finally, replace the oil cap and refill the engine with the recommended type and amount of oil.

Troubleshooting Common Issues

Common issues with oil filler necktubes may include leaks or blockages. If a leak is detected, inspect the seals and gaskets for wear or damage and replace them if necessary. Ensure that the necktube is securely fitted to prevent oil from escaping. Blockages can occur due to debris or sludge buildup; in such cases, cleaning the necktube and ensuring that the oil being used is of high quality can help resolve the issue.

Maintenance Tips

To ensure the longevity and optimal performance of the Cummins 3911679 Oil Filler Necktube, regular maintenance is important. Inspect the necktube and its connections during routine oil changes to check for signs of wear or damage. Clean the area around the necktube to prevent debris from entering the lubrication system. Follow the manufacturer’s guidelines for replacement intervals to ensure that the necktube remains in good condition.

About Cummins

Cummins Inc. is a global power leader that designs, manufactures, and distributes a wide range of power solutions, including engines, filtration, and emission solutions. With a history spanning over a century, Cummins is committed to innovation and quality, providing reliable and efficient products for various industries, including automotive, construction, and agriculture. The company’s dedication to excellence is evident in its extensive product range and its focus on meeting the evolving needs of its customers.

Cummins Engine Compatibility with Oil Filler Necktube Part 3911679

The Cummins Oil Filler Necktube part number 3911679 is designed to fit seamlessly with a variety of Cummins engines, ensuring compatibility and ease of maintenance. This part is important for the proper functioning of the engine’s lubrication system, allowing for the addition of oil without hassle.

Compatible Engines

• 4B3.9
• 6B5.9
• 6C8.3
• B5.9 G
• C GAS PLUS CM556
• C8.3 G

These engines, while differing in specifications and applications, share a common design feature that allows the Oil Filler Necktube part 3911679 to fit effectively. The design of this part ensures that it can be easily installed and removed, providing a reliable method for oil replenishment.

Grouping of Compatible Engines

The engines listed can be grouped based on their series and common characteristics:

• 4B3.9, 6B5.9, 6C8.3, C8.3 G: These engines are part of the B and C series, known for their robust construction and high performance. The Oil Filler Necktube part 3911679 is engineered to fit these engines, ensuring a snug and secure connection.

• B5.9 G, C GAS PLUS CM556: These engines, while part of the G series, also benefit from the universal design of the Oil Filler Necktube part 3911679. This part’s compatibility with these engines highlights its versatility and importance in maintaining engine health.

By ensuring that the Oil Filler Necktube part 3911679 is compatible with these engines, Cummins maintains a high standard of quality and reliability, making it easier for technicians and operators to maintain their engines effectively.

Role of Part 3911679 Oil Filler Necktube in Engine Systems

The Oil Filler Necktube, identified by part number 3911679, is a component in the lubrication system of an engine. It facilitates the process of adding oil to the engine, ensuring that the lubrication system remains adequately filled.

Integration with the Cylinder Block

The Oil Filler Necktube is strategically positioned to interface with the cylinder block. The cylinder block houses the cylinders, pistons, and other critical components. The necktube allows for the direct addition of oil into the crankcase, which is an integral part of the cylinder block. This ensures that the oil reaches the sump or oil pan located beneath the cylinder block, where it is stored and circulated by the oil pump.

Interaction with the Engine Cover

The Oil Filler Necktube also plays a role when interacting with the engine cover. The engine cover, which encases the top portion of the engine, often includes an opening that aligns with the necktube. This alignment allows for convenient access to the filler neck, enabling the technician to add oil without removing the cover. The cover helps in protecting the internal components from contaminants and also aids in reducing noise and vibration.

In summary, the Oil Filler Necktube (part 3911679) is a vital link in the engine’s lubrication system, ensuring that oil is efficiently added and maintained within the engine, supporting the smooth operation of the cylinder block and other internal components.

Conclusion

The Cummins 3911679 Oil Filler Necktube is a critical component in the maintenance and operation of heavy-duty truck engines. Its design and features ensure efficient oil addition and maintenance, contributing to the engine’s performance and longevity. Regular maintenance and proper installation are key to maximizing the benefits of this Cummins part.