4090121
Spark Plug
Cummins®

Introduction

The Cummins 4090121 Spark Plug is a critical component for commercial trucks, designed to ignite the air-fuel mixture within the engine’s cylinders. This process is essential for the operation of internal combustion engines, ensuring efficient and reliable engine performance ².

Basic Concepts of Spark Plugs

Spark plugs are essential for igniting the air-fuel mixture in internal combustion engines. They consist of an insulated central electrode and a metal shell that serves as the ground electrode. The spark generated by the central electrode ignites the mixture, leading to combustion that powers the vehicle. Proper spark plug function is crucial for engine efficiency, power output, and emissions levels ¹.

Role of the 4090121 Spark Plug in Truck Operation

The Cummins 4090121 Spark Plug is engineered to meet the demanding requirements of commercial truck engines. It ensures consistent and reliable ignition, contributing to engine efficiency and improved fuel economy. Proper combustion facilitated by the spark plug results in lower emissions, aligning with environmental regulations. The spark plug’s robust design supports engine durability under heavy-duty use.

Key Features

The Cummins 4090121 Spark Plug features a robust design and high-quality materials to endure the high temperatures and pressures in commercial truck engines. Its electrodes resist wear and corrosion, ensuring longevity. The insulation withstands electrical demands, and the thread provides a secure fit within the engine cylinder.

Benefits

Using the Cummins 4090121 Spark Plug offers several advantages, including enhanced engine performance, better acceleration, and power. It improves fuel efficiency through more complete combustion and supports compliance with environmental standards by reducing emissions. Its durability ensures reliable operation under strenuous conditions, reducing maintenance frequency.

Troubleshooting and Maintenance

Common spark plug issues include misfires due to fouling or wear. Regular inspection and cleaning can prevent these issues. Following manufacturer recommendations for replacement intervals ensures optimal performance. Maintenance practices such as checking the spark plug gap and ensuring proper torque during installation contribute to the longevity and effectiveness of this Cummins part.

About Cummins

Cummins Inc. is a global leader in diesel and natural gas engines and related technologies. With a history of innovation and commitment to quality, Cummins has established itself as a trusted name in the commercial vehicle industry. The company’s expertise is reflected in its range of products, including the Cummins 4090121 Spark Plug, designed to meet high standards for heavy-duty applications ².

Compatibility of Cummins Spark Plug 4090121

The Cummins Spark Plug part number 4090121 is designed to fit various Cummins engines, ensuring reliable ignition and performance. Here’s how this part fits with the specified engines:

G855 Series

• G855
• G855 CM558

The 4090121 spark plug is compatible with the G855 engines, including the G855 CM558 variant. These engines are known for their robust design and are often used in heavy-duty applications.

GTA38 Series

• GTA38 G CMEICS G116C
• GTA855 CM558 (CM2358) G101

The GTA38 series engines, such as the GTA38 G CMEICS G116C and GTA855 CM558 (CM2358) G101, also utilize the 4090121 spark plug. These engines are typically found in medium-duty applications and are engineered for durability and efficiency.

KTA19 Series

• KTA19GC
• KTA19GC CM558
• KTA38GC CM558

The KTA19GC engines, including the KTA19GC CM558 and KTA38GC CM558, are another group where the 4090121 spark plug is suitable. These engines are designed for both on-highway and off-highway use, providing versatility in various industrial applications.

N14 Series

• N14 G

Lastly, the N14 G engine is compatible with the 4090121 spark plug. This engine is widely recognized for its use in heavy-duty trucks and is known for its power and reliability.

By ensuring that the 4090121 spark plug is used in these engines, you can maintain optimal performance and longevity, as it is specifically designed to meet the demands of Cummins engines.

Role of Part 4090121 Spark Plug in Engine Systems

The part 4090121 Spark Plug is integral to the ignition system of an engine. Its primary function is to ignite the air-fuel mixture within the combustion chamber, facilitating the power stroke that drives the engine’s operation.

In the ignition system, the spark plug works with the ignition coil to generate a high-voltage electrical spark. This spark is transmitted through the spark plug’s electrode, igniting the compressed air-fuel mixture. The efficiency of this ignition process directly influences the engine’s performance, fuel efficiency, and emissions.

The spark plug’s role extends beyond mere ignition. It contributes to the overall health of the engine system by ensuring consistent and reliable combustion. Proper functioning of the spark plug helps maintain optimal engine temperature, reduces wear on other components, and enhances the longevity of the engine.

Conclusion

The Cummins 4090121 Spark Plug is a vital component for commercial trucks, ensuring efficient and reliable engine performance. Its robust design, high-quality materials, and compatibility with various Cummins engines make it an essential part for maintaining optimal engine operation and longevity.