3968247
Speed Indicator Ring
Cummins®

Introduction

The Cummins 3968247 Speed Indicator Ring is a component designed to provide accurate speed readings within the engine system of commercial trucks. Its purpose is to ensure that the vehicle’s speed is measured and displayed correctly, contributing to the overall operational efficiency and safety of the truck. This component is integral to the engine’s monitoring system, offering precise data that aids in the management and maintenance of the vehicle ¹.

Function and Operation

The Speed Indicator Ring operates by interacting with the engine’s speed sensor. As the ring rotates with the engine’s components, it passes by the sensor, generating electrical signals that correspond to the engine’s rotational speed. These signals are then processed by the vehicle’s electronic control unit (ECU), which translates them into speed readings displayed on the dashboard. This mechanism ensures that the driver has real-time access to accurate speed information, which is vital for safe and efficient driving ².

Key Features

The 3968247 Speed Indicator Ring is characterized by its robust design and high-quality materials, which contribute to its durability and reliability. It is crafted from materials that can withstand the harsh conditions within an engine, ensuring long-term performance. The ring’s precise engineering allows for accurate speed measurement, which is crucial for the proper functioning of the vehicle’s speed monitoring system.

Role in Truck Operation

In the operation of a commercial truck, the Speed Indicator Ring plays a significant role by providing accurate speed data to the driver and the vehicle’s systems. This information is used not only for speed display but also for various engine management functions, including fuel injection timing and transmission shifting. Accurate speed data contributes to optimal engine performance and efficiency, ensuring that the truck operates smoothly and economically.

Benefits

The advantages of the Cummins 3968247 Speed Indicator Ring include improved accuracy in speed measurement, which enhances the driver’s awareness and control over the vehicle. Its durable construction ensures long-term reliability, reducing the need for frequent replacements. Additionally, accurate speed data can contribute to better fuel efficiency by allowing the engine management system to make precise adjustments based on the vehicle’s speed.

Installation and Compatibility

Proper installation of the Speed Indicator Ring is crucial for its effective operation. It should be installed according to the manufacturer’s guidelines to ensure it is correctly aligned and secured. Compatibility with various Cummins engine models is an important consideration, ensuring that the ring fits and functions as intended within the specific engine system.

Maintenance and Troubleshooting

To ensure optimal performance, the Speed Indicator Ring should be regularly inspected for signs of wear or damage. Common issues may include inaccurate speed readings or sensor malfunctions, which can often be traced back to the ring. Troubleshooting steps may involve checking the alignment and condition of the ring, as well as ensuring that the speed sensor is functioning correctly.

Safety Considerations

When working with the Speed Indicator Ring, it is important to follow safety guidelines to prevent injury and ensure accurate installation and maintenance. This includes proper handling of the component to avoid damage, as well as careful inspection for any signs of wear or malfunction that could affect the vehicle’s performance.

Cummins Overview

Cummins Inc. is a global power leader that designs, manufactures, and distributes engines, filtration, and power generation products. With a history of innovation and quality, Cummins has established a strong reputation in the commercial truck industry. The company’s product range includes a variety of engines and components designed to meet the demanding requirements of commercial vehicles, ensuring reliability, performance, and efficiency.

Speed Indicator Ring Compatibility with Cummins Engines

The Speed Indicator Ring part 3968247, manufactured by Cummins, is a crucial component for various engine models. This part is designed to fit seamlessly with a range of Cummins engines, ensuring accurate speed readings and reliable performance. Below is a detailed overview of the engine compatibility for this specific part.

ISC Series Engines

• ISC CM2150
• ISC CM850
• ISC8.3 CM2250

The Speed Indicator Ring is compatible with the ISC series engines, which are known for their robust performance and efficiency. These engines are often used in heavy-duty applications, and the ring ensures that the speed readings are precise, which is critical for maintaining operational efficiency.

ISL Series Engines

• ISL CM2150
• ISL G CM2180
• ISL9 CM2150 SN
• ISL9 CM2250

The ISL series engines benefit from the Speed Indicator Ring, providing accurate speed data that is essential for both performance and safety. These engines are widely used in various industries, including transportation and construction, where precise speed monitoring is vital.

L Series Engines

• L GAS PLUS CM556
• L8.9 CM2670 L134C
• L8.9G CMOH2.0 L125B
• L9 CM2670 L128B

The L series engines, which include both gas and diesel variants, are designed for versatility and efficiency. The Speed Indicator Ring ensures that these engines maintain optimal performance by providing accurate speed readings, which is crucial for both fuel efficiency and engine longevity.

QSC and QSL Series Engines

• QSC8.3 CM850 (CM2850)
• QSC9 CM2250 / QSL9 CM2250
• QSL8.9 CM2150 L141
• QSL9 CM2250
• QSL9 CM2350 L102
• QSL9 CM850 (CM2850)
• QSL9 G CM558
• QSL9.3 CM2880 L113

The QSC and QSL series engines are known for their high performance and reliability. The Speed Indicator Ring is compatible with these engines, ensuring that they provide accurate speed data, which is essential for maintaining performance and safety in demanding applications. These engines are often used in heavy-duty trucks and industrial machinery, where precise speed monitoring is critical.

Role of Part 3968247 Speed Indicator Ring in Engine Systems

The Speed Indicator Ring (Part 3968247) is an integral component in the monitoring and regulation of engine performance. It is strategically positioned to interact with several key engine components, ensuring precise measurement and feedback of operational parameters.

Interaction with the Cylinder Block

The Speed Indicator Ring is mounted on the cylinder block, where it plays a significant role in tracking the rotational speed of the engine. As the cylinder block houses the cylinders and provides structural support, the ring’s accurate placement ensures that it can effectively monitor the crankshaft’s revolutions. This interaction allows for real-time data collection on engine speed, which is essential for maintaining optimal performance and efficiency.

Relationship with the Engine Crankshaft

One of the primary functions of the Speed Indicator Ring is to work in conjunction with the engine crankshaft. The crankshaft converts the linear motion of the pistons into rotational motion, driving the vehicle’s wheels. The ring is designed to provide feedback on the crankshaft’s rotational speed, which is vital for the engine control unit (ECU) to make necessary adjustments. This ensures that the engine operates within safe parameters, enhancing both performance and longevity.

Integration with the Cylinder

Although the Speed Indicator Ring does not directly interface with the cylinder, its role in monitoring crankshaft speed indirectly affects cylinder operation. Accurate speed data allows the ECU to optimize the timing of fuel injection and ignition, which are critical for efficient combustion within the cylinders. This, in turn, ensures that the engine delivers maximum power with minimal fuel consumption and reduced emissions.

Overall Engine System Contribution

In summary, the Speed Indicator Ring (Part 3968247) is a vital component in the engine system, providing essential data that enables the ECU to make real-time adjustments. Its interaction with the cylinder block and engine crankshaft ensures that the engine operates efficiently and within specified parameters. This component’s role in enhancing engine performance and reliability underscores its importance in modern engine systems.

Conclusion

The Cummins 3968247 Speed Indicator Ring is a critical component in the engine systems of commercial trucks, ensuring accurate speed measurement and contributing to the overall efficiency and safety of the vehicle. Its robust design, precise engineering, and compatibility with various Cummins engine models make it an essential part for maintaining optimal engine performance. Regular maintenance and proper installation are key to ensuring the longevity and reliability of this Cummins part.