3426722
Engine Crankshaft
Cummins®

Introduction

The Cummins 3426722 Engine Crankshaft is a vital component in the engine assembly of commercial trucks. It is designed to facilitate the conversion of linear piston motion into rotational motion, which is fundamental for the operation of the engine. This crankshaft is integral to the efficient and reliable performance of Cummins engines, ensuring that the truck operates smoothly and effectively.

Basic Concepts of Engine Crankshafts

An engine crankshaft is a mechanical part that plays a central role in the operation of an internal combustion engine. Its primary function is to convert the linear motion of the pistons into rotational motion, which drives the vehicle’s wheels. This conversion is achieved through a series of crankpins and connecting rods that are precisely engineered to maintain balance and efficiency. The crankshaft’s design and material are critical to its performance, durability, and the overall efficiency of the engine ¹.

Purpose of the Cummins 3426722 Engine Crankshaft

The Cummins 3426722 Engine Crankshaft is specifically engineered to meet the demanding requirements of commercial truck engines. It plays a role in the engine assembly by ensuring smooth and efficient power transmission from the pistons to the drivetrain. This crankshaft is designed to handle high loads and stresses, contributing to the engine’s reliability and performance. Its precise engineering allows for optimal balance and reduced vibrations, which are crucial for the longevity and efficiency of the engine ².

Key Features

The Cummins 3426722 Engine Crankshaft boasts several key features that enhance its performance and durability. It is constructed from high-quality materials, such as forged steel, which provide strength and resilience under high stress conditions. The crankshaft’s design includes carefully balanced counterweights and precisely machined journals to ensure smooth operation and minimal wear. Additionally, it features advanced coatings and treatments that improve its resistance to wear and corrosion, further enhancing its longevity ³.

Benefits

The Cummins 3426722 Engine Crankshaft offers several benefits that contribute to the overall efficiency, reliability, and longevity of the engine. Its high-quality construction and precise engineering result in improved engine performance and reduced maintenance requirements. The crankshaft’s design helps to minimize vibrations and balance the engine, leading to a smoother operation and increased fuel efficiency. Furthermore, its durability ensures that it can withstand the rigors of commercial truck use, providing long-term reliability and performance ⁴.

Installation Process

Installing the Cummins 3426722 Engine Crankshaft requires careful attention to detail and the use of specific tools to ensure proper fit and function. The process involves removing the old crankshaft, inspecting the engine block for any damage or wear, and then installing the new crankshaft. It is important to align the crankshaft correctly with the engine’s bearings and ensure that all connecting rods are properly attached. Torque specifications must be followed to secure the crankshaft in place, and any necessary clearances should be checked to prevent interference with other engine components ⁵.

Common Issues and Troubleshooting

Common issues associated with engine crankshafts can include wear, misalignment, and damage from excessive stress or improper installation. Symptoms of crankshaft problems may include engine vibrations, reduced performance, or unusual noises. Troubleshooting steps involve inspecting the crankshaft for signs of wear or damage, checking the alignment and fit within the engine block, and ensuring that all connecting components are securely attached. In some cases, crankshaft replacement may be necessary to restore engine performance and reliability ⁶.

Maintenance Tips

To ensure the optimal performance and longevity of the Cummins 3426722 Engine Crankshaft, regular maintenance is recommended. This includes periodic inspections for signs of wear or damage, ensuring that all bearings and journals are properly lubricated, and following manufacturer-recommended replacement intervals. Additionally, maintaining proper engine operating conditions, such as optimal oil levels and temperatures, can help prevent excessive stress on the crankshaft and extend its service life ⁷.

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 producing high-quality, reliable engine components that meet the needs of various industries, including commercial trucking. The company is committed to innovation, sustainability, and customer satisfaction, ensuring that its products deliver exceptional performance and durability ⁸.

Engine Crankshaft Compatibility with Cummins Part 3426722

The Cummins Engine Crankshaft part number 3426722 is designed to fit seamlessly within a variety of engine models. This crankshaft is engineered to ensure optimal performance and reliability across different engine configurations. Below is a detailed description of how this crankshaft integrates with specific Cummins engines.

QSV91G and QSW/QSV82 Engines

The Cummins Engine Crankshaft part 3426722 is compatible with the QSV91G engine. This compatibility ensures that the crankshaft’s design and specifications align perfectly with the engine’s requirements, facilitating smooth operation and efficient power transfer.

Similarly, the crankshaft is also suitable for the QSW/QSV82 engines. The design of part 3426722 is tailored to meet the specific demands of these engines, providing a robust and durable solution for maintaining engine integrity and performance.

By ensuring that the crankshaft is precisely engineered for these engines, Cummins guarantees that the part will function optimally within the engine’s operational parameters, contributing to the overall efficiency and longevity of the engine ⁹.

Role of Part 3426722 Engine Crankshaft in Engine Systems

The part 3426722 Engine Crankshaft is integral to the operation of the engine, serving as the backbone that translates the linear motion of the pistons into rotational force. This rotational force is essential for driving the engine’s various components.

Interaction with Key Engine Components

• Pistons and Connecting Rods: The crankshaft is connected to the pistons via the connecting rods. As the pistons move up and down within the cylinders, the connecting rods transfer this motion to the crankshaft, causing it to rotate.

• Flywheel: The crankshaft is linked to the flywheel, which helps to smooth out the engine’s power delivery. The flywheel stores rotational energy and works in conjunction with the crankshaft to maintain consistent engine speed.

• Timing Chain/Belt: The crankshaft is synchronized with the camshaft via the timing chain or belt. This ensures that the valves open and close at the correct times in relation to the pistons’ movements, optimizing the engine’s performance and efficiency.

• Crankshaft Pulley: Attached to the front of the crankshaft, the crankshaft pulley drives essential engine accessories such as the alternator, power steering pump, and air conditioning compressor. These accessories rely on the crankshaft’s rotation to function.

• Main Bearings: The crankshaft rotates within the main bearings, which are housed in the engine block. These bearings reduce friction and wear, allowing the crankshaft to spin smoothly and efficiently.

• Counterweights: Integrated into the crankshaft design, counterweights help to balance the rotating assembly. They reduce vibrations caused by the reciprocating motion of the pistons, contributing to a smoother engine operation.

• Oil Pump: In many engine designs, the crankshaft drives the oil pump, ensuring a continuous supply of lubricated oil to the engine’s moving parts. This lubrication is vital for reducing wear and maintaining engine health.

In summary, the part 3426722 Engine Crankshaft plays a significant role in coordinating the movements within the engine, ensuring that all components work harmoniously to deliver power efficiently ¹⁰.

Conclusion

The Cummins 3426722 Engine Crankshaft is a critical component in the engine assembly of commercial trucks, designed to convert linear piston motion into rotational motion. Its high-quality construction, precise engineering, and compatibility with various Cummins engines ensure optimal performance, reliability, and longevity. Regular maintenance and proper installation are essential to maximize the benefits of this crankshaft, contributing to the overall efficiency and durability of the engine.