4943979
Engine Connecting Rod
Cummins®

Introduction

The Cummins 4943979 Engine Connecting Rod is a critical component in the engine systems of heavy-duty trucks. It facilitates the conversion of linear piston motion into rotational crankshaft motion, which is essential for engine operation. This part is designed to withstand the demanding conditions of heavy-duty applications, ensuring reliable performance and efficiency.

Basic Concepts of Engine Connecting Rods

An engine connecting rod acts as a link between the piston and the crankshaft within an internal combustion engine. Its primary function is to transmit the force generated by the piston’s linear motion to the crankshaft, converting it into rotational motion. This conversion is vital for the engine’s operation, enabling the crankshaft to drive the vehicle’s transmission and propel the truck. The connecting rod must be robust and precisely engineered to handle the high stresses and dynamic loads encountered during engine operation ¹.

Role of the 4943979 Engine Connecting Rod in Truck Operation

The 4943979 Engine Connecting Rod efficiently transfers the force from the piston to the crankshaft. This transfer is achieved through the rod’s design, which includes a small end that connects to the piston via a wrist pin and a large end that attaches to the crankshaft journal. As the piston moves up and down within the cylinder, the connecting rod translates this motion into the rotational movement of the crankshaft. This seamless conversion of motion is essential for the engine’s performance and the truck’s overall operation ².

Key Features of the 4943979 Engine Connecting Rod

The 4943979 Engine Connecting Rod is characterized by several key features that enhance its performance and durability. It is constructed from high-strength materials, typically forged steel, which provides the necessary resilience to withstand the extreme pressures and temperatures within the engine. The rod’s design includes precision machining and heat treatment processes to ensure dimensional accuracy and material strength. Additionally, the connecting rod features optimized weight distribution and balanced design to minimize inertial forces and enhance engine efficiency ³.

Benefits of Using the 4943979 Engine Connecting Rod

Utilizing the 4943979 Engine Connecting Rod offers several benefits for heavy-duty truck engines. Its robust construction and precise engineering contribute to improved engine efficiency by ensuring smooth and reliable power transmission. The rod’s durability allows it to withstand the rigors of heavy-duty operation, reducing the likelihood of premature failure. Furthermore, the enhanced performance of the connecting rod supports the overall reliability and longevity of the engine, making it a valuable component for demanding applications.

Troubleshooting and Maintenance Suggestions

To maintain optimal performance and longevity of the 4943979 Engine Connecting Rod, regular inspection and maintenance are recommended. Common issues may include wear at the bearing surfaces, cracks in the rod body, or damage to the connecting cap bolts. Routine checks should involve visual inspections for signs of wear or damage, as well as monitoring the rod’s clearance and alignment. Additionally, ensuring proper lubrication and addressing any abnormal engine noises promptly can help prevent more severe problems. Following the manufacturer’s maintenance guidelines and schedules will contribute to the connecting rod’s reliable operation.

Cummins: A Brief Overview

Cummins Inc. is a globally recognized leader in the design, manufacture, and distribution of diesel and natural gas engines, as well as related technologies. With a history spanning over a century, Cummins has established a reputation for producing high-quality engine components that meet the demanding requirements of heavy-duty applications. The company’s commitment to innovation, quality, and customer satisfaction has made it a trusted name in the industry, providing reliable and efficient solutions for a wide range of industries and applications.

Cummins Engine Connecting Rod 4943979 Compatibility

The Cummins Engine Connecting Rod part number 4943979 is designed to fit a variety of Cummins engines, ensuring robust performance and reliability across different applications. Below is a detailed breakdown of the engines with which this connecting rod is compatible:

4B3.9 Series

• 4B3.9

6B5.9 Series

• 6B5.9

B3.3 Series

• B3.3

B4.5 Series

• B4.5 CM2350 B129B
• B4.5 RGT

B5.6 Series

• B5.6 CM2670 B152B

B5.9 Series

• B5.9 CM2670 B166C
• B5.9 G
• B5.9 GAS PLUS CM556

B6.7 Series

• B6.7 CM2350 B135B
• B6.7 CM2670 B153B
• B6.7 CM2670 B164C
• B6.7 G CMOH6.0 B125

G5.9 Series

• G5.9
• G5.9 CM558

ISB Series

• ISB (Chrysler)
• ISB CM2150
• ISB CM550
• ISB CM850
• ISB/ISD4.5 CM2150 B119
• ISB/ISD6.7 CM2150 SN
• ISB3.9 CM2220 B107
• ISB4.5 CM2350 B104
• ISB5.9 CM2880 B110
• ISB5.9 CM2880 B127

This connecting rod is engineered to provide optimal performance and durability, making it a reliable choice for the listed engines. Each engine variant may have specific requirements or nuances, but the 4943979 connecting rod is designed to meet the demands of Cummins’ diverse engine lineup.

Role of Part 4943979 Engine Connecting Rod in Various Engine Systems

The Part 4943979 Engine Connecting Rod is a fundamental component in several engine configurations, facilitating the conversion of the piston’s linear motion into rotational motion for the crankshaft. Here’s how it integrates with various engine systems:

Short Blocks

In a Short Block configuration, which includes the cylinder block, crankshaft, pistons, and related components but excludes the cylinder head and valve train, the connecting rod is essential. It links the pistons to the crankshaft, ensuring efficient transfer of motion and power.

Long Blocks

A Long Block setup, which adds the cylinder head, valve train, and sometimes the fuel injection system to the short block, also relies on the connecting rod. This component remains pivotal in maintaining the integrity of the power transmission from the pistons to the crankshaft.

Specific Block Configurations

• Block 6-B Short: In this configuration, the connecting rod ensures smooth operation by connecting the pistons to the crankshaft.
• Short 4BT and Short 4BTA: These blocks depend on the connecting rod to maintain the mechanical linkage necessary for engine function.
• Short 6BT and Short E2 Incent: Here, the connecting rod plays a role in the efficient transfer of motion within the engine.
• Short E3 Incent and Short Euro1: The connecting rod is integral to these blocks, ensuring the pistons’ linear motion is effectively converted to crankshaft rotation.
• Short 6B Block and Short E1 180 Block: These blocks utilize the connecting rod to maintain engine performance and reliability.
• Short E2 215/235 Block and Short E2 Block: The connecting rod is crucial in these configurations for the proper functioning of the engine.
• Short E215/235 Block: This block also relies on the connecting rod to ensure seamless operation.

Cylinder Block Kits and Short Block Kits

In Cylinder Block Kits and Short Block Kits, which are pre-assembled units ready for installation, the connecting rod is a key component. It ensures that the pistons’ motion is accurately transmitted to the crankshaft, contributing to the engine’s overall performance.

Camshaft and Injector Plumbing

While the Camshaft and Injector Plumbing are not directly connected to the connecting rod, the rod’s role in the engine’s mechanical efficiency indirectly supports these components by ensuring smooth engine operation.

Performance Parts and Service Blocks

In Performance Parts and Service Blocks, the connecting rod is often upgraded or meticulously maintained to enhance engine performance and reliability. Its role in these setups is to provide a robust link between the pistons and crankshaft, supporting higher performance levels.

Long Block Kit

In a Long Block Kit, which includes all components necessary to build a complete engine except for ancillary parts like the fuel system and exhaust, the connecting rod remains a vital component. It ensures that the engine’s mechanical components work in harmony, contributing to overall engine efficiency and power output.

Conclusion

The Cummins 4943979 Engine Connecting Rod is a vital component in heavy-duty truck engines, ensuring the efficient conversion of piston motion into crankshaft rotation. Its robust construction, precise engineering, and compatibility with various Cummins engines make it a reliable choice for demanding applications. Regular maintenance and adherence to manufacturer guidelines are essential for maintaining the performance and longevity of this part.