3074256
Tappet Top Stop Lock Nut
Cummins®

The Tappet Top Stop Lock Nut, identified by part number 3074256, is a component manufactured by Cummins, a leader in the automotive and heavy-duty truck industry. This part plays a role in the valve train system of heavy-duty truck engines, contributing to the overall efficiency and reliability of the engine.

Function and Operation

The Tappet Top Stop Lock Nut operates within the valve train system by securing the tappet in place, thereby maintaining the proper valve clearance. This clearance is important for the efficient operation of the engine, as it ensures that the valves open and close at the correct times and with the appropriate force. By locking the tappet in position, the nut helps to prevent excessive movement that could lead to valve train noise, increased wear, and potential engine damage ¹.

Key Features

The design and material characteristics of the Tappet Top Stop Lock Nut are tailored to enhance its performance and durability. Constructed from high-strength materials, the nut is capable of withstanding the high temperatures and pressures present in heavy-duty truck engines. Its precise engineering ensures a secure fit, reducing the likelihood of loosening over time. Additionally, the nut may feature unique attributes such as a locking mechanism to prevent rotation, further ensuring its stability within the valve train system ².

Benefits

The Tappet Top Stop Lock Nut offers several advantages that contribute to improved engine performance. By maintaining proper valve clearance, it helps to ensure efficient engine operation, which can lead to better fuel economy and reduced emissions. The nut’s durable construction and secure fit reduce the need for frequent maintenance, allowing for longer intervals between service checks. Furthermore, its reliable performance in demanding operating conditions enhances the overall reliability of the engine, making it a valuable component for heavy-duty applications ³.

Installation and Maintenance

Proper installation of the Tappet Top Stop Lock Nut is important for ensuring optimal performance. It should be torqued to the manufacturer’s specified settings to achieve the correct tension without overtightening, which could damage the tappet or other components. Regular maintenance checks should be performed to verify that the nut remains securely in place and that there are no signs of wear or damage. If issues such as valve train noise or inconsistent engine performance arise, inspecting the Tappet Top Stop Lock Nut and its associated components can help identify and resolve the problem.

Manufacturer - Cummins

Cummins Inc. is a global power leader that designs, manufactures, and distributes engines, filtration, and power generation products. With a rich history dating back to 1919, Cummins has established a reputation for producing high-quality engine components. The company’s commitment to innovation, quality, and customer satisfaction is evident in its extensive range of products, including the Tappet Top Stop Lock Nut. Cummins’ expertise in engine technology ensures that their components are designed to meet the rigorous demands of heavy-duty applications.

Compatibility with Cummins Engines

The Tappet Top Stop Lock Nut (part number 3074256) is designed to fit seamlessly with the following Cummins engines:

• M11 CELECT PLUS
• M11 MECHANICAL

These engines are part of Cummins’ M11 series, which is renowned for its reliability and performance in heavy-duty applications. The Tappet Top Stop Lock Nut is integral to the functioning of the valve train in these engines, providing a secure connection that prevents the tappet from moving excessively, which could lead to valve damage or engine failure.

Installation and Function

In the M11 CELECT PLUS and M11 MECHANICAL engines, the Tappet Top Stop Lock Nut is used to lock the tappet in place, ensuring that it remains stationary relative to the camshaft. This lock nut works in conjunction with other components in the valve train, such as the tappet, rocker arm, and valve spring, to maintain the precise timing and movement required for the engine to run smoothly.

Proper installation of the Tappet Top Stop Lock Nut is crucial. It involves securing the nut to the tappet using the appropriate torque specifications to ensure a tight and reliable fit. This prevents any movement that could compromise the engine’s performance or lead to potential failures.

Importance in Engine Performance

The Tappet Top Stop Lock Nut plays a role in the overall health and longevity of the engine. By securing the tappet and preventing excessive movement, it helps maintain the correct valve clearance, which is important for optimal engine performance. This component is particularly important in high-stress environments where the engine is subjected to heavy loads and high RPMs.

Role of Part 3074256 in Engine Systems

The Tappet Top Stop Lock Nut, identified by part number 3074256, is a component in the orchestration of various engine systems. Its primary function is to secure the tappet in place, ensuring that the camshaft’s motion is accurately transmitted to the valve train. This precision is important for the efficient operation of the cylinder head, where the combustion process takes place.

In conjunction with the camshaft, the Tappet Top Stop Lock Nut helps maintain the correct valve timing. This timing is imperative for the synchronization of fuel injection by the injector, which, in turn, affects the overall performance of the engine. The lock nut’s role in preserving the integrity of the valve train setup directly influences the engine’s performance parts, as any deviation can lead to a decrease in engine efficiency and power output.

Furthermore, the Tappet Top Stop Lock Nut interacts with the oil manifold system. Proper valve train setup ensures that the oil distribution to various engine components, including the camshaft and cylinder head, is not compromised. This is important for lubrication and cooling, which are necessary for the longevity and reliability of engine parts.

Conclusion

The Tappet Top Stop Lock Nut (part number 3074256) is a key component in the valve train system of heavy-duty truck engines. Its role in maintaining proper valve clearance, ensuring efficient engine operation, and contributing to the overall reliability of the engine cannot be overstated. Proper installation and maintenance of this part are fundamental to the engine’s performance and the durability of its components.