4931041
Piston Pin
Cummins®

The 4931041 Piston Pin by Cummins is a specialized component designed for use in Cummins engines, particularly those found in commercial trucks. This piston pin plays a role in connecting the piston to the connecting rod, facilitating the reciprocating motion within the engine cylinder. Its significance lies in ensuring the smooth and efficient operation of the engine, contributing to the overall performance and reliability of commercial trucks ¹.

Basic Concepts of Piston Pins

Piston pins, also known as wrist pins, are cylindrical components that connect the piston to the connecting rod in an internal combustion engine. They allow the piston to move up and down within the cylinder while the connecting rod converts this linear motion into rotational motion at the crankshaft. This reciprocating motion is fundamental to the engine’s operation, enabling the conversion of fuel energy into mechanical work ².

Role of the 4931041 Piston Pin in Truck Operation

The 4931041 Piston Pin by Cummins is engineered to play a specific role in the operation of Cummins engines. It contributes to efficient power transmission by ensuring a secure and smooth connection between the piston and the connecting rod. This connection is vital for maintaining the engine’s performance, as it allows for precise and consistent motion of the piston within the cylinder. The pin’s design and material properties are tailored to withstand the high stresses and temperatures encountered in commercial truck engines, thereby enhancing engine performance and durability ³.

Key Features

The 4931041 Piston Pin is characterized by several key features that enhance its performance and durability. It is typically made from high-strength materials such as forged steel or heat-treated alloys, which provide the necessary strength and resistance to wear. The pin’s design may include features such as a polished surface to reduce friction and specialized coatings to improve wear resistance. These attributes contribute to the pin’s ability to operate efficiently under the demanding conditions of commercial truck engines.

Benefits

The use of the 4931041 Piston Pin offers several benefits to engine operation. Improved engine efficiency is achieved through reduced friction and wear, leading to smoother piston movement and more consistent power delivery. The pin’s durable construction helps to minimize wear and tear on both the piston and the connecting rod, extending the overall lifespan of the engine components. Additionally, the enhanced reliability of the engine system contributes to lower maintenance costs and increased uptime for commercial trucks.

Troubleshooting and Maintenance

Common issues associated with piston pins include wear, fatigue, and improper lubrication. Diagnostic procedures for identifying problems may involve visual inspection for signs of wear or damage, as well as measuring the pin’s clearance within the piston and connecting rod. Maintenance practices to ensure optimal performance and longevity of the 4931041 Piston Pin include regular lubrication, monitoring for signs of wear, and replacing the pin if necessary. Proper maintenance helps to prevent catastrophic failure and ensures the continued efficient operation of the engine.

About Cummins

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 innovation and quality in the commercial truck industry. The company’s commitment to advancing engine technology and providing reliable, high-performance products has made it a preferred choice for commercial truck manufacturers and operators worldwide. Cummins’ dedication to excellence is reflected in its comprehensive range of engine solutions, designed to meet the diverse needs of the transportation sector.

Cummins Piston Pin 4931041 Compatibility

The Cummins Piston Pin part number 4931041 is designed to fit a variety of Cummins engine models. This part is engineered to ensure smooth and reliable engine operation by securely connecting the piston to the connecting rod. Below is a detailed overview of the engines with which this piston pin is compatible.

B4.5 Series

• B4.5 CM2350 B129B
• B4.5 RGT

B6.7 Series

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

D4.0 Series

• D4.0 CM2620 D103B

F4.5 Series

• F4.5 CM2620 F139B
• F4.5 CM2620 F141C

ISB Series

• ISB (Chrysler)
• ISB CM2150
• ISB CM850
• ISB/ISD4.5 CM2150 B119
• ISB/ISD6.7 CM2150 SN
• ISB4.5 CM2350 B104
• ISB6.7 CM2250
• ISB6.7 CM2350 B101

ISBE Series

• ISBE CM2150
• ISBE4 CM850

ISD Series

• ISD4.5 CM2220 D108

ISF Series

• ISF3.8 CM2220 AN
• ISF4.5 CM2220 F123

QSB Series

• QSB4.5 CM2250 EC
• QSB4.5 CM850 (CM2850)
• QSB6.7 CM2250

This piston pin is meticulously designed to meet the stringent requirements of Cummins engines, ensuring durability and performance across a wide range of applications.

Understanding the Role of Part 4931041 Piston Pin in Engine Systems

The part 4931041 Piston Pin is an essential component in the operation of various engine systems. It facilitates the connection between the engine piston and the connecting rod, allowing for the efficient transfer of force generated during the combustion process.

Interaction with the Connecting Rod and Piston

The Piston Pin serves as a pivotal joint, enabling the connecting rod to articulate smoothly as the engine piston moves up and down within the cylinder. This articulation is vital for converting the linear motion of the piston into the rotational motion of the crankshaft, which ultimately drives the vehicle.

Contribution to the Cylinder Block and Cylinder Block Kit

Within the cylinder block, the Piston Pin ensures that the engine piston remains aligned and moves uniformly. This alignment is necessary to maintain the integrity of the cylinder walls and to prevent excessive wear. When integrated into a cylinder block kit, the Piston Pin contributes to the overall efficiency and longevity of the engine by ensuring that all moving parts operate in harmony.

Role in the Cylinder Head and Engine Piston Kit

The interaction between the Piston Pin, engine piston, and cylinder head is intricate. As the piston approaches top dead center, the Piston Pin must withstand significant forces without deformation. In an engine piston kit, the inclusion of a high-quality Piston Pin is imperative for maintaining the precision required for optimal combustion efficiency and power output.

Importance in the Long Block and Long Block Kit

In a long block or long block kit, which includes the cylinder block, crankshaft, pistons, and connecting rods, the Piston Pin plays a role in ensuring that the assembled components function as a cohesive unit. It allows for the necessary flexibility and strength required during the engine’s operation, contributing to the reliability and performance of the long block.

Integration with the Overhaul Kit and Oversize Engine Piston Kit

During engine refurbishment with an overhaul kit or when using an oversize engine piston kit, the Piston Pin must be carefully selected to match the new dimensions and specifications of the pistons. This ensures that the refurbished engine maintains its intended performance characteristics and durability.

Performance and Parts

High-performance engines demand components that can handle increased stress and higher operating temperatures. The Piston Pin, as a performance part, must be manufactured to precise tolerances and from materials that can endure these demanding conditions without failure.

Conclusion

The 4931041 Piston Pin is a fundamental component that enables the smooth operation of the engine’s moving parts. Its proper function is integral to the engine’s performance, efficiency, and longevity.