4948504
Main Bearing
Cummins®

The Cummins 4948504 Main Bearing is a component designed for use in heavy-duty truck engines. It serves a pivotal role in the operation of these engines by supporting the crankshaft and enabling its smooth rotation within the engine block. This bearing is integral to maintaining the efficiency and reliability of the engine, ensuring that the crankshaft operates under minimal friction and with optimal support ¹.

Basic Concepts of Main Bearings

Main bearings are components found in internal combustion engines that support the crankshaft. Their primary function is to reduce friction between the crankshaft and the engine block, allowing for smooth rotation. By facilitating this motion, main bearings contribute to the overall efficiency and longevity of the engine. They are typically composed of materials that can withstand high loads and temperatures, ensuring durable performance over time ².

Purpose of the Cummins 4948504 Main Bearing

The Cummins 4948504 Main Bearing is specifically engineered to support the crankshaft in heavy-duty truck engines. It plays a role in the engine’s operation by providing a low-friction interface that allows the crankshaft to rotate smoothly within the engine block. This bearing is designed to handle the significant loads and stresses that are characteristic of heavy-duty applications, ensuring reliable performance under demanding conditions ³.

Key Features

The Cummins 4948504 Main Bearing features a design that enhances its performance and durability. It is constructed from materials that offer high resistance to wear and corrosion, ensuring longevity even under harsh operating conditions. The bearing’s design also includes precision engineering to ensure a perfect fit within the engine, minimizing friction and maximizing efficiency ⁴.

Benefits

The Cummins 4948504 Main Bearing offers several advantages. It contributes to improved engine efficiency by reducing friction between the crankshaft and the engine block. This reduction in friction not only enhances the engine’s performance but also contributes to its longevity by minimizing wear on critical components. Additionally, the bearing’s design ensures reliable operation under high load and temperature conditions, making it suitable for heavy-duty applications ¹.

Installation Process

Installing the Cummins 4948504 Main Bearing requires careful attention to detail to ensure proper fit and function. The process involves cleaning the engine block to remove any debris or old bearing material, followed by the precise placement of the new bearing. It is important to use the correct tools and follow manufacturer guidelines to avoid damage to the bearing or the engine block during installation ².

Maintenance and Troubleshooting

Maintaining the Cummins 4948504 Main Bearing involves regular inspections for signs of wear or damage. Common issues may include increased friction or noise during engine operation, which can indicate bearing failure. Troubleshooting these issues may involve inspecting the bearing for signs of wear, checking the lubrication system for proper function, and ensuring that the engine block is clean and free of debris ³.

Performance Under Stress

The Cummins 4948504 Main Bearing is designed to perform reliably under various operating conditions, including high load and temperature scenarios. Its material composition and precision engineering allow it to withstand the stresses associated with heavy-duty truck engines, ensuring consistent performance and durability over time ⁴.

Compatibility with Cummins Engines

The Cummins 4948504 Main Bearing is compatible with a range of Cummins engine models, playing a role in ensuring optimal engine performance. Its design and specifications are tailored to meet the demands of these engines, contributing to their efficiency, reliability, and longevity ¹.

Cummins: A Brief Overview

Cummins Inc. is a global power leader that designs, manufactures, and distributes a wide range of power solutions, including engines, filtration, and emissions solutions. With a history of innovation and a commitment to quality, Cummins has established a strong reputation in the heavy-duty truck industry. The company’s product range includes engines designed for various applications, from on-highway to off-highway and industrial uses, all aimed at delivering reliable performance and efficiency ².

Cummins Main Bearing Part 4948504 Compatibility

The Cummins Main Bearing part number 4948504 is a critical component designed to fit a variety of Cummins engines. This part is engineered to provide reliable support and reduce friction within the engine, ensuring optimal performance and longevity. Below is a detailed description of the engines with which this main bearing is compatible.

Compatible Engines

• B4.5 CM2350 B129B
• D4.0 CM2620 D103B
• F3.8 CM2350 F120B
• F3.8 CM2350 F128C
• F3.8 CM2620 F137B
• F3.8 F102
• F4.5 CM2620 F139B
• F4.5 CM2620 F141C
• ISB4.5 CM2350 B104
• ISF3.8 CM2220 AN
• ISF3.8 CM2220 F103
• ISF3.8 CM2350 F109
• ISF4.5 CM2220 F123
• QSF3.8 CM2350 F107
• QSF3.8 CM2880 F112

Grouping by Engine Series

F Series Engines

• F3.8 CM2350 F120B
• F3.8 CM2350 F128C
• F3.8 CM2620 F137B
• F3.8 F102
• F4.5 CM2620 F139B
• F4.5 CM2620 F141C

The F series engines, ranging from F3.8 to F4.5, are designed for various applications, including heavy-duty trucks and industrial use. The part 4948504 is compatible with these engines, ensuring smooth operation and durability.

ISB and ISF Series Engines

• ISB4.5 CM2350 B104
• ISF3.8 CM2220 AN
• ISF3.8 CM2220 F103
• ISF3.8 CM2350 F109
• ISF4.5 CM2220 F123

The ISB and ISF series engines are known for their reliability and efficiency. The main bearing part 4948504 fits these engines, providing the necessary support and reducing wear and tear.

QS and QSF Series Engines

• QSF3.8 CM2350 F107
• QSF3.8 CM2880 F112

The QS and QSF series engines are typically used in medium-duty applications. The part 4948504 is compatible with these engines, ensuring they run smoothly and efficiently.

This compatibility ensures that the part 4948504 can be used across a wide range of Cummins engines, providing a reliable solution for maintenance and repairs ³.

Role of Part 4948504 Main Bearing in Engine Systems

The part 4948504 Main Bearing is integral to the efficient operation of the engine’s primary components. It facilitates the smooth rotation of the crankshaft within the engine block, reducing friction and wear between the crankshaft and the cylinder block.

When installed as part of a standard main bearing kit, the 4948504 Main Bearing ensures that the crankshaft maintains precise alignment with the cylinder block. This alignment is essential for the consistent and reliable operation of the engine.

The bearing’s design allows it to absorb and distribute the loads exerted by the crankshaft, which are generated during the engine’s operation. This load distribution helps in maintaining the structural integrity of the cylinder block and ensures that the crankshaft operates within specified tolerances.

Additionally, the 4948504 Main Bearing contributes to the overall lubrication system of the engine. By providing a smooth surface for the crankshaft to rotate on, it allows the lubricant to form a consistent film between the bearing and the crankshaft journal. This lubricant film is vital for minimizing metal-to-metal contact, which can lead to excessive wear and potential engine failure.

In summary, the 4948504 Main Bearing plays a significant role in the interplay between the crankshaft, cylinder block, and the lubrication system, ensuring the engine operates efficiently and durably ⁴.

Conclusion

The Cummins 4948504 Main Bearing is a critical component in the operation of heavy-duty truck engines. Its design and features contribute to the efficiency, reliability, and longevity of the engine by reducing friction, supporting the crankshaft, and ensuring proper alignment and lubrication. Regular maintenance and proper installation are essential to maximize the benefits of this bearing, ensuring optimal engine performance over time.