3950135
Camshaft Gear
Cummins®

The Cummins 3950135 Camshaft Gear is a component designed for use in heavy-duty truck engines. It serves a pivotal role in the synchronization of engine operations, ensuring that the camshaft and crankshaft maintain precise timing. This gear is integral to the efficient functioning of the engine, contributing to the overall performance and reliability of the vehicle.

Basic Concepts of Camshaft Gears

A camshaft gear is a toothed wheel that interfaces with the camshaft, a shaft equipped with lobes that actuate the engine’s valves. The camshaft gear’s primary function is to transmit rotational force from the crankshaft to the camshaft, ensuring that the opening and closing of the valves are timed correctly in relation to the piston’s movement. This interaction is typically facilitated through a timing chain or belt, which connects the camshaft gear to the crankshaft sprocket ¹.

Purpose and Function of the Cummins 3950135 Camshaft Gear

The Cummins 3950135 Camshaft Gear is specifically engineered to maintain the timing of valve operations in correlation with the crankshaft. By ensuring that the camshaft rotates at half the speed of the crankshaft, this gear allows for the precise control of valve timing, which is crucial for the engine’s combustion process. Proper valve timing enhances engine efficiency, power output, and fuel economy ².

Key Features

The Cummins 3950135 Camshaft Gear is characterized by several key features that enhance its performance and durability. It is constructed from high-quality materials that are resistant to wear and corrosion, ensuring longevity under the demanding conditions of heavy-duty truck operation. The gear’s design specifications include precise tooth profiling and robust construction, which contribute to smooth operation and reliable performance. Additionally, any unique attributes, such as special coatings or treatments, may further enhance its durability and efficiency.

Benefits of Using the Cummins 3950135 Camshaft Gear

Utilizing the Cummins 3950135 Camshaft Gear offers several advantages. It contributes to improved engine performance by ensuring accurate valve timing, which is vital for optimal combustion. The gear’s high-quality construction and precise engineering also enhance the engine’s reliability and longevity, reducing the likelihood of premature failure or the need for frequent replacements. Furthermore, the use of this gear can lead to better fuel efficiency and reduced emissions, aligning with industry standards for environmental responsibility ³.

Installation Considerations

Proper installation of the Cummins 3950135 Camshaft Gear is crucial for ensuring its effective operation and the overall health of the engine. Guidelines for installation include adhering to torque specifications to secure the gear without overtightening, which could lead to damage. Alignment procedures must be followed to ensure that the gear meshes correctly with the timing chain or belt. Compatibility with other engine components should also be verified to prevent operational issues.

Maintenance and Troubleshooting

Maintaining the Cummins 3950135 Camshaft Gear is important for ensuring optimal performance and longevity. Regular inspection for signs of wear or damage, such as chipped teeth or excessive play, is recommended. Lubrication according to the manufacturer’s guidelines can also prevent premature wear. Common issues that may arise include timing discrepancies or gear failure, which can often be resolved through careful troubleshooting and, if necessary, replacement of the gear or associated components.

Cummins Overview

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 has established a reputation for manufacturing high-quality engine components that are trusted by industries worldwide. The company’s commitment to innovation, quality, and customer satisfaction underscores its position as a leader in the automotive and heavy-duty truck sectors.

Cummins Camshaft Gear 3950135 Compatibility

The Cummins Camshaft Gear 3950135 is a critical component designed to fit a variety of Cummins engine models. This part is integral to the engine’s operation, ensuring the camshaft and crankshaft are synchronized correctly. Below is a detailed breakdown of the engine models with which this camshaft gear is compatible.

ISC Series Engines

• ISC CM2150
• ISC CM850
• ISC8.3 CM2250

The ISC series engines are known for their robust performance and reliability, often used in heavy-duty applications. The camshaft gear 3950135 is specifically engineered to fit these models, ensuring smooth and efficient engine operation.

ISL Series Engines

• ISL CM2150
• ISL G CM2180
• ISL9 CM2150 SN
• ISL9 CM2250

The ISL series engines are designed for both on-highway and off-highway applications, providing a balance of power and efficiency. The camshaft gear 3950135 is compatible with these engines, ensuring precise timing and synchronization.

QSC Series Engines

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

The QSC series engines are engineered for high-performance applications, often found in construction and agricultural equipment. The camshaft gear 3950135 fits these engines, ensuring that the camshaft and crankshaft maintain the correct timing.

QSL Series Engines

• QSL8.9 CM2150 L141
• QSL9 CM2250
• QSL9 CM2350 L102
• QSL9 CM850(CM2850)
• QSL9 G CM558

The QSL series engines are designed for a variety of applications, from on-highway to off-highway use. The camshaft gear 3950135 is compatible with these engines, ensuring optimal engine performance and reliability.

L GAS PLUS Series Engine

• L GAS PLUS CM556

The L GAS PLUS series engine is designed for natural gas applications, providing a clean and efficient power source. The camshaft gear 3950135 fits this engine, ensuring that the camshaft and crankshaft maintain the correct timing, even under the unique demands of natural gas operation.

This camshaft gear is a critical component for maintaining engine performance and reliability across a wide range of Cummins engine models. Its compatibility with the listed engines ensures that operators can rely on consistent and efficient engine operation.

Role of Part 3950135 Camshaft Gear in Engine Systems

The camshaft gear, identified by part number 3950135, is an integral component in the synchronization and operation of various engine systems. Its primary function is to ensure the camshaft rotates in precise coordination with the crankshaft, which is essential for the proper timing of valve operations.

Interaction with the Camshaft

The camshaft gear meshes with the crankshaft gear, driven by the timing chain or belt. This mechanical linkage ensures that the camshaft’s lobes open and close the valves in the cylinder head at the correct moments in the engine’s operating cycle. Proper timing is vital for efficient combustion and overall engine performance.

Coordination with Connecting Rod and Piston

The camshaft gear’s role extends to the connecting rod and piston assembly. As the crankshaft rotates, driven by the camshaft gear, the connecting rods transfer this motion to the pistons. This movement facilitates the intake, compression, power, and exhaust strokes, all of which must be synchronized with the valve events controlled by the camshaft.

Integration with the Cylinder Head

In the cylinder head, the camshaft gear ensures that the valves open and close in harmony with the piston’s movement. This synchronization is necessary for optimal air-fuel mixture intake and exhaust gas evacuation, directly influencing engine efficiency and power output.

Relationship with Fuel Injector and Fuel Manifold

The precise timing governed by the camshaft gear also affects the fuel injection system. In engines equipped with fuel injectors, the camshaft’s rotation dictates the timing of fuel delivery. This ensures that the fuel is injected into the combustion chamber at the optimal moment for efficient burning. Similarly, in systems with a fuel manifold, the camshaft gear’s accurate timing helps maintain consistent fuel distribution across all cylinders.

Impact on Performance Parts

For engines modified with performance parts, the camshaft gear’s accuracy becomes even more significant. High-performance camshafts often require more precise timing to maximize power output and efficiency. The camshaft gear must be in top condition to handle the increased stresses and ensure that the enhanced camshaft operates within its designed parameters.

Conclusion

In summary, the Cummins 3950135 Camshaft Gear plays a significant role in the synchronized operation of the camshaft, connecting rod and piston, cylinder head, fuel injector, and fuel manifold. Its accurate functioning is essential for the reliable performance of both standard and high-performance engine systems.