4003911
Rocker Lever
Cummins®

Introduction

The Rocker Lever 4003911 by Cummins is a component designed for use in commercial trucks. It serves a specific function within the engine’s valve train mechanism, contributing to the overall operation and performance of the vehicle. This part is integral to the engine’s ability to efficiently manage valve operation, which is crucial for the engine’s combustion process ¹.

Basic Concepts of Rocker Levers

A rocker lever, in the context of an engine, is a mechanical component that amplifies the motion from the camshaft to the valves. It acts as a lever, converting the rotational motion of the camshaft into the linear motion required to open and close the engine valves. This conversion is vital for the precise timing and operation of the valve train, ensuring that the valves open and close at the correct moments during the engine’s cycle ².

Role of the 4003911 Rocker Lever in Truck Operation

The 4003911 Rocker Lever plays a role in the engine’s operation by facilitating the transfer of motion from the camshaft to the valves via pushrods. It is designed to work in conjunction with other components of the valve train, ensuring that the valves are actuated with the necessary force and timing. This interaction is fundamental to the engine’s ability to perform efficiently, as it directly influences the combustion process by controlling the intake and exhaust of gases.

Key Features

The 4003911 Rocker Lever is characterized by several key features that enhance its performance and durability. It is constructed from high-quality materials, ensuring resistance to wear and corrosion. The design incorporates precise engineering to maintain optimal leverage and reduce friction, contributing to the efficiency of valve actuation. Additionally, the rocker lever may feature unique characteristics such as a specific geometry or surface treatment that further enhances its operational capabilities.

Benefits

The use of the 4003911 Rocker Lever in commercial trucks offers several benefits. It contributes to improved engine efficiency by ensuring precise and reliable valve operation. The durability of the component supports the engine’s reliability and longevity, reducing the likelihood of unexpected failures. Furthermore, its design may facilitate easier maintenance and repair, minimizing downtime and operational costs for fleet managers.

Troubleshooting and Maintenance

Common issues with the 4003911 Rocker Lever may include wear, noise, or failure to actuate valves properly. Diagnostic procedures should involve a thorough inspection of the rocker lever and related components for signs of wear or damage. Maintenance practices to ensure optimal performance include regular checks for proper clearances, lubrication, and the condition of the rocker lever and its pivot points. Addressing issues promptly can prevent more significant engine problems and extend the component’s service life.

About Cummins

Cummins Inc. is a global power leader that designs, manufactures, and distributes engines, filtration, and power generation products. With a history spanning over a century, Cummins is committed to innovation, quality, and customer satisfaction. The company offers a wide range of products and services designed to meet the needs of various industries, including transportation, construction, and power generation. Cummins’ dedication to excellence and continuous improvement ensures that its products, like the 4003911 Rocker Lever, meet the high standards required for demanding applications.

Compatibility of Rocker Lever Part 4003911 with Cummins Engines

The Rocker Lever part number 4003911, manufactured by Cummins, is designed to fit a variety of Cummins engines. This part is integral to the engine’s valve train system, ensuring proper valve operation and overall engine performance.

ISM Series Engines

• ISM CM570: This engine model is compatible with the Rocker Lever part 4003911.
• ISM CM570/870: This dual-model designation indicates that the Rocker Lever part 4003911 is suitable for both configurations.
• ISM CM876: This engine also fits the Rocker Lever part 4003911, ensuring smooth valve operation.
• ISM11 CM876 SN: This specific variant of the ISM11 series is compatible with the Rocker Lever part 4003911.

QSM Series Engines

• QSM11 CM570: The Rocker Lever part 4003911 is designed to fit this engine model, ensuring reliable valve actuation.
• QSM11 CM876: This engine model is also compatible with the Rocker Lever part 4003911.

M11 Series Engines

• M11 CELECT: This electronically controlled engine model is compatible with the Rocker Lever part 4003911.
• M11 CELECT PLUS: This enhanced version of the M11 CELECT engine also fits the Rocker Lever part 4003911.
• M11 MECHANICAL: The mechanical version of the M11 engine is also compatible with the Rocker Lever part 4003911.

L10 Series Engine

• L10 CELECT: This engine model is compatible with the Rocker Lever part 4003911, ensuring proper valve operation.

The Rocker Lever part 4003911 is engineered to meet the specific requirements of these Cummins engines, ensuring durability and performance. Its compatibility across various engine models highlights its versatility and importance in maintaining the engine’s operational integrity.

Role of Part 4003911 Rocker Lever in Engine Systems

The part 4003911 Rocker Lever is an integral component within the engine’s valve train system, facilitating the transfer of motion from the camshaft to the valves. This transfer is essential for the precise timing of valve opening and closing, which directly influences engine performance and efficiency.

Interaction with the Lever

The Rocker Lever, specifically part 4003911, interfaces directly with the lever component of the valve train. This interaction allows for the amplification of the camshaft’s motion, ensuring that the valves open sufficiently to allow the necessary airflow into and out of the combustion chamber. The lever’s design enables it to pivot on a fulcrum, translating the rotational motion of the camshaft into the linear motion required to operate the valves.

Integration with the Rocker

In conjunction with the rocker, the Rocker Lever plays a pivotal role in maintaining the mechanical advantage needed for efficient valve operation. The rocker, often part of a rocker arm assembly, works in tandem with the lever to ensure that the force applied by the camshaft is effectively transmitted to the valve stem. This synergy is vital for achieving the desired valve lift and duration, which are critical for optimal engine performance.

Function within the Rocker Top-Level Assembly

Within the rocker top-level assembly, the Rocker Lever (part 4003911) is a key element that contributes to the overall functionality and reliability of the valve train. This assembly typically includes the rocker arm, pivot point, and any associated hardware necessary for mounting and operation. The Rocker Lever’s precise engineering ensures that it can withstand the high stresses and dynamic loads encountered within the engine environment, providing consistent and reliable valve actuation throughout the engine’s operational life.

Lever Component Dynamics

The lever component, when integrated with the Rocker Lever, enhances the system’s ability to modulate valve timing and lift. This modulation is essential for adapting to varying engine speeds and loads, ensuring that the engine operates efficiently across a wide range of conditions. The lever’s design also contributes to reducing friction and wear within the valve train, promoting longevity and reliability.

Conclusion

In summary, part 4003911 Rocker Lever is a fundamental component in the engine’s valve train system, working in concert with the lever, rocker, and rocker top-level assembly to ensure precise and efficient valve operation. Its role in amplifying camshaft motion and facilitating the transfer of force to the valves is essential for maintaining engine performance and efficiency.