4996250
Main Bearing
Cummins®

Introduction

The Cummins 4996250 Main Bearing is a component designed for use in heavy-duty truck engines. It plays a role in ensuring the smooth and efficient operation of the engine by supporting the crankshaft and facilitating its rotation. Understanding the function and significance of this bearing is important for maintaining engine performance and longevity.

Basic Concepts of Main Bearings

Main bearings are components found in internal combustion engines. Their primary function is to support the crankshaft, allowing it to rotate with minimal friction. These bearings operate by providing a low-friction surface between the crankshaft and the engine block, which helps to distribute the load and reduce wear on the crankshaft journals ¹.

Purpose of the Cummins 4996250 Main Bearing

The Cummins 4996250 Main Bearing supports the crankshaft in a truck engine, maintaining its alignment and stability as it rotates at high speeds. By facilitating smooth rotation, the bearing helps to ensure that the engine operates efficiently and with reduced wear on critical components.

Key Features

The Cummins 4996250 Main Bearing is characterized by several key features that enhance its performance. These include a precision-engineered design that ensures a proper fit within the engine block, high-quality materials that provide durability and resistance to wear, and advanced manufacturing techniques that contribute to its reliability. Additionally, the bearing may incorporate features such as oil grooves to facilitate lubrication and improve heat dissipation.

Benefits

The use of the Cummins 4996250 Main Bearing in a truck engine can lead to several benefits. These include improved engine efficiency due to reduced friction, enhanced durability that contributes to longer engine life, and reliable performance under the demanding conditions typical of heavy-duty applications. The bearing’s design and material composition also contribute to its ability to withstand high loads and temperatures.

Installation and Maintenance

Proper installation of the Cummins 4996250 Main Bearing is important for ensuring optimal performance and longevity. This involves careful alignment within the engine block, the use of appropriate tools and techniques to avoid damage, and adherence to manufacturer guidelines. Regular maintenance practices, such as monitoring oil quality and levels, can help to ensure the bearing remains in good condition. Additionally, following recommended service intervals for inspection and replacement can contribute to the bearing’s longevity and the engine’s overall performance.

Troubleshooting Common Issues

Common problems associated with main bearings include wear, oil starvation, and misalignment. Diagnostic methods for identifying these issues may involve visual inspection, measurement of clearances, and analysis of oil samples. Potential solutions can range from cleaning and lubrication to replacement of the bearing. Addressing these issues promptly can help to prevent more serious engine damage and ensure continued reliable operation.

Cummins Overview

Cummins Inc. is a well-established company with a significant presence in the automotive and heavy-duty truck industry. Founded in 1919, Cummins has built a reputation for producing high-quality engines and components. The company’s commitment to innovation, quality, and customer satisfaction has contributed to its success and enduring reputation in the industry ².

Compatibility of Cummins Part 4996250 with Various Engine Models

The Cummins part 4996250, a Main Bearing, is designed to fit seamlessly within a variety of engine models. Here is a detailed breakdown of its compatibility across different engines:

F2.8 CM2620 F135B

This engine model benefits from the precision engineering of the Cummins part 4996250, ensuring smooth operation and longevity.

ISF2.8 CM2220 F117, ISF2.8 CM2220 F129

Both the ISF2.8 CM2220 F117 and ISF2.8 CM2220 F129 engines are compatible with the Cummins part 4996250. This part is crucial for maintaining the structural integrity and operational efficiency of these engines.

QSF2.8 CM2880 Series

The Cummins part 4996250 is also suitable for the following engines within the QSF2.8 CM2880 series:

• QSF2.8 CM2880 F104
• QSF2.8 CM2880 F105
• QSF2.8 CM2880 F108
• QSF2.8 CM2880 F114

These engines rely on the high-quality construction of the part 4996250 to ensure reliable performance and durability.

R2.8 CM2220 R101B

The Cummins part 4996250 is also compatible with the R2.8 CM2220 R101B engine, providing essential support and stability for its operation.

This part is engineered to meet the specific requirements of each engine model, ensuring optimal performance and reliability across the board.

Role of Part 4996250 Main Bearing in Engine Systems

The part 4996250 Main Bearing is an essential component in the smooth operation of an engine, facilitating the interaction between several key components.

Interaction with the Engine Block

The engine block, which forms the structural foundation of the engine, houses the main bearings. These bearings are strategically positioned within the block to support the crankshaft. The main bearing, specifically part 4996250, ensures that the crankshaft is held in place with precision, allowing it to rotate smoothly within the engine block. This interaction is vital for maintaining the alignment and balance of the crankshaft as it operates.

Support for the Crankshaft

As the crankshaft rotates, it converts the linear motion of the pistons into rotational motion, which is then transmitted to the rest of the engine components. The main bearing, part 4996250, plays a significant role here by providing a low-friction surface that allows the crankshaft to spin with minimal resistance. This reduces wear and tear on both the crankshaft and the engine block, contributing to the overall efficiency and longevity of the engine.

Integration with the Cylinder and Piston Assembly

The cylinders within the engine block house the pistons, which move up and down in a reciprocating motion. This motion is transferred to the crankshaft via connecting rods. The main bearing, part 4996250, supports the crankshaft at its journals, ensuring that the force generated by the pistons is efficiently transmitted. This support is essential for maintaining the integrity of the cylinder and piston assembly, as it ensures that the forces are evenly distributed and that the engine operates smoothly.

Standard Main Bearing Set Configuration

In most engine designs, a standard main bearing set is used, which includes multiple main bearings like part 4996250. These bearings are typically arranged in a specific configuration to match the design of the crankshaft and the engine block. The standard set ensures that each journal of the crankshaft is properly supported, which is important for the engine’s balance, performance, and durability.

Summary of Component Interaction

In summary, part 4996250 Main Bearing is integral to the functioning of the engine block, crankshaft, cylinder, and piston assembly. Its role in providing support and reducing friction is key to the efficient operation and longevity of the engine. The use of a standard main bearing set, including part 4996250, ensures that all components work in harmony, leading to optimal engine performance.

Conclusion

The Cummins 4996250 Main Bearing is a critical component in heavy-duty truck engines, ensuring smooth operation and longevity by supporting the crankshaft and reducing friction. Its precision-engineered design, high-quality materials, and compatibility with various engine models make it a reliable choice for maintaining engine performance and efficiency.