3964713
Rocker Lever
Cummins®

The Rocker Lever 3964713 by Cummins is a component designed for use in commercial truck engines. It contributes to the overall functionality of the engine system by facilitating the operation of the valve train. This part is integral to ensuring that the engine operates efficiently and reliably under various conditions.

Basic Concepts of Rocker Levers

Rocker levers are mechanical components found in internal combustion engines. Their primary function is to transfer motion from the camshaft to the valves. By amplifying the camshaft’s motion, rocker levers ensure that the valves open and close at the correct times and with the appropriate force. This precise timing and force are crucial for the engine’s combustion process, directly impacting its performance and efficiency ¹.

Purpose of the 3964713 Rocker Lever

The 3964713 Rocker Lever is specifically engineered to interact with other engine components to regulate valve operation in truck engines. It plays a role in converting the rotational motion of the camshaft into the linear motion required to open and close the valves. This conversion ensures that air and fuel enter the combustion chamber at the optimal time, contributing to efficient combustion and overall engine performance.

Key Features

The 3964713 Rocker Lever is constructed with high-quality materials to withstand the demanding conditions within a commercial truck engine. Its design includes precise engineering specifications to ensure compatibility and performance. Unique attributes such as enhanced durability and resistance to wear contribute to its reliable operation over time.

Benefits

The 3964713 Rocker Lever offers several advantages, including improved engine efficiency, increased durability, and enhanced reliability. These benefits contribute to the overall performance of the truck by ensuring that the engine operates smoothly and efficiently under various load conditions. The rocker lever’s design also helps in reducing maintenance requirements, providing cost-effective operation over the vehicle’s lifespan.

Installation and Integration

Proper installation of the 3964713 Rocker Lever is crucial for its effective operation within the engine system. The process involves ensuring that the lever is correctly aligned with the camshaft and valves. Tools required for installation may include torque wrenches and specialized alignment tools. Following manufacturer guidelines ensures that the rocker lever is integrated seamlessly into the engine, maintaining the engine’s performance and reliability.

Troubleshooting Common Issues

Common problems associated with rocker levers can include noise, improper valve timing, and wear. These issues may arise from incorrect installation, lack of lubrication, or normal wear and tear. Troubleshooting steps involve inspecting the lever for signs of damage, ensuring proper alignment, and applying the recommended lubrication. Addressing these issues promptly helps maintain the engine’s performance and longevity.

Maintenance Tips

To ensure the longevity and optimal performance of the 3964713 Rocker Lever, regular maintenance is recommended. This includes periodic inspections for signs of wear or damage, ensuring proper lubrication, and following manufacturer guidelines for replacement intervals. Adhering to these maintenance practices helps prevent unexpected failures and ensures the rocker lever continues to operate efficiently.

Cummins: A Brief Overview

Cummins Inc. is a leading manufacturer in the commercial truck industry, known for its commitment to quality and innovation. With a diverse product range that includes engines, filtration, and power generation equipment, Cummins has established a reputation for reliability and performance. The company’s focus on technological advancement and customer satisfaction underscores its position as a trusted provider in the industry ².

Rocker Lever 3964713 Compatibility with Cummins Engines

The Rocker Lever part number 3964713, manufactured by Cummins, is a critical component in the valve train system of various Cummins engines. This part ensures the proper operation of the engine’s valves by maintaining the correct clearance and timing. Below is a detailed description of how this rocker lever fits with the specified Cummins engines.

ISC Series Engines

• ISC CM2150
• ISC CM554
• ISC CM850
• ISC8.3 CM2250

The 3964713 is compatible with the ISC series engines, which include the ISC CM2150, ISC CM554, ISC CM850, and ISC8.3 CM2250. These engines are known for their robust design and are widely used in various applications, including heavy-duty trucks and industrial machinery.

ISL Series Engines

• ISL CM2150
• ISL CM554
• ISL G CM2180
• ISL9 CM2150 SN
• ISL9 CM2250
• ISL9.5 CM2880 L138

The 3964713 is also suitable for the ISL series engines, which include the ISL CM2150, ISL CM554, ISL G CM2180, ISL9 CM2150 SN, ISL9 CM2250, and ISL9.5 CM2880 L138. These engines are designed for high performance and efficiency, making them ideal for on-highway and vocational applications.

L Series Engines

• L GAS PLUS CM556
• L8.9
• L8.9 CM2670 L134C
• L8.9 L121
• L8.9G CMOH2.0 L125B
• L9.5 L117

The 3964713 fits the L series engines, which include the L GAS PLUS CM556, L8.9, L8.9 CM2670 L134C, L8.9 L121, L8.9G CMOH2.0 L125B, and L9.5 L117. These engines are designed for both natural gas and diesel applications, providing flexibility and efficiency in various industries.

QSC Series Engines

• QSC8.3 CM2880 C102
• QSC8.3 CM554
• QSC8.3 CM850 (CM2850)
• QSC9 CM2250 / QSL9 CM2250

The 3964713 is also compatible with the QSC series engines, which include the QSC8.3 CM2880 C102, QSC8.3 CM554, QSC8.3 CM850 (CM2850), and QSC9 CM2250 / QSL9 CM2250. These engines are known for their reliability and are often used in construction and agricultural equipment.

G Series Engines

• 6C8.3
• G8.3
• G8.3 CM558
• GTA8.3 CM558

Lastly, the 3964713 fits the G series engines, which include the 6C8.3, G8.3, G8.3 CM558, and GTA8.3 CM558. These engines are designed for high-performance applications and are commonly used in various heavy-duty and industrial settings.

Role of Part 3964713 Rocker Lever in Engine Systems

The Rocker Lever, specifically part 3964713, is an integral component in the operation of an engine’s valve train system. It acts as a pivotal link between the camshaft and the valves, facilitating the precise opening and closing of the engine’s intake and exhaust valves.

When the camshaft rotates, it pushes against the rocker lever through the cam lobe. This action causes the rocker lever to pivot on its fulcrum, which is typically a shaft or stud. As the rocker lever pivots, it transfers the motion to the valve stem, either directly or through a pushrod in overhead valve (OHV) engines. This transfer of motion ensures that the valves open and close in sync with the engine’s timing requirements.

In overhead cam (OHC) engines, the rocker lever assembly often includes additional components such as roller followers or hydraulic lifters. These components help to maintain consistent valve clearance and reduce friction, ensuring smooth and efficient valve operation. The rocker lever’s design allows for adjustments to valve clearance, which is essential for maintaining optimal engine performance over time.

The interaction between the rocker lever and other components such as the valve springs, valve seats, and valve guides is also significant. The valve springs keep the valves seated when they are not being actuated, while the valve seats and guides ensure that the valves move smoothly and seal properly against the cylinder head.

In summary, the Rocker Lever part 3964713 plays a significant role in the efficient and timely operation of the engine’s valve train, ensuring that the valves open and close in harmony with the engine’s operational cycle.

Conclusion

The 3964713 Rocker Lever by Cummins is a critical component in the valve train system of various commercial truck engines. Its role in converting the rotational motion of the camshaft into linear motion for the valves ensures efficient and reliable engine operation. The part’s high-quality construction, compatibility with multiple Cummins engine series, and the benefits it offers in terms of engine efficiency and durability make it a valuable component in the maintenance and performance of truck engines.