4936663
Belt Tensioner
Cummins®

The Cummins 4936663 Belt Tensioner is a component designed to maintain the proper tension on drive belts within commercial truck engines. Its role is significant in ensuring the efficient operation of various engine-driven accessories, such as alternators, water pumps, and air conditioning compressors.

Basic Concepts of Belt Tensioners

A belt tensioner is a device used in an engine system to keep drive belts at the correct tension. It functions by applying consistent pressure to the belt, which helps in reducing slippage and wear. Maintaining proper belt tension is important for the efficient transfer of power from the engine to the accessories it drives, ensuring they operate effectively and reliably ¹.

Purpose of the 4936663 Belt Tensioner

The Cummins 4936663 Belt Tensioner plays a role in the operation of a truck by maintaining the correct tension on drive belts. This ensures that the belts do not slip or become overly tight, which could lead to premature wear or failure. Proper tensioning contributes to the smooth and efficient operation of engine-driven accessories.

Key Features

This Cummins part is characterized by several design elements and materials that enhance its performance. It is constructed from durable materials to withstand the rigors of heavy-duty applications. Its design includes features that allow for easy adjustment and maintenance, ensuring it can be quickly and effectively serviced when needed.

Benefits of Using the 4936663 Belt Tensioner

Using the Cummins 4936663 Belt Tensioner offers several advantages. It contributes to improved engine efficiency by ensuring that drive belts operate at optimal tension. This reduces wear on the belts and the accessories they drive, leading to enhanced reliability and longevity of the engine components. Additionally, proper belt tensioning can lead to better fuel efficiency and reduced maintenance costs over time ².

Installation and Compatibility

Proper installation of the Cummins 4936663 Belt Tensioner involves following specific guidelines to ensure it is correctly positioned and tensioned. It is designed to be compatible with a range of truck models and engine types, making it a versatile component for fleet maintenance and repair.

Maintenance and Troubleshooting

Routine maintenance of the Cummins 4936663 Belt Tensioner is important to ensure optimal performance. This includes regular inspections for signs of wear or damage and ensuring that the tensioner is properly adjusted. Common issues that may arise include belt slippage or tensioner failure, which can often be addressed through adjustment or replacement.

Performance and Durability

The Cummins 4936663 Belt Tensioner is engineered to perform reliably under various operating conditions, including heavy-duty applications. Its durability is a result of the high-quality materials used in its construction and the precision engineering that goes into its design. This ensures that it can withstand the demands of commercial truck operations.

Cummins Overview

Cummins Inc. is a well-established manufacturer in the commercial truck industry, known for its commitment to quality and innovation in automotive components. The company has a long history of providing reliable and high-performance parts, including the Cummins 4936663 Belt Tensioner, which reflects its dedication to enhancing the efficiency and reliability of commercial vehicles.

Belt Tensioner 4936663 Compatibility with Cummins Engines

The Belt Tensioner part number 4936663, manufactured by Cummins, is designed to fit a range of Cummins engines. This part is crucial for maintaining the proper tension of the engine’s serpentine belt, ensuring efficient power transmission and preventing belt slippage. Below is a detailed look at the compatibility of this belt tensioner with various Cummins engines:

Compatible Engines

• 6C8.3
• ISL9 CM2150 SN
• ISL9.5 CM2880 L138
• L8.9
• L8.9 CM2670 L134C
• QSC8.3 CM2880 C102
• QSL8.9 CM2150 L141
• QSL9 CM850 (CM2850)

Grouping by Engine Series

ISL Series

• ISL9 CM2150 SN
• ISL9.5 CM2880 L138

The ISL series engines are known for their robust performance and reliability, often used in heavy-duty applications. The Belt Tensioner 4936663 is engineered to fit these engines, ensuring that the serpentine belt maintains the correct tension, which is vital for the engine’s smooth operation.

L Series

• L8.9
• L8.9 CM2670 L134C

The L series engines are typically used in medium-duty applications and are valued for their durability and efficiency. The Belt Tensioner 4936663 is compatible with these engines, providing the necessary tension to keep the serpentine belt in optimal condition.

QSC Series

• QSC8.3 CM2880 C102

The QSC series engines are designed for both on-highway and off-highway applications, offering a balance of power and efficiency. The Belt Tensioner 4936663 fits these engines, ensuring that the serpentine belt operates correctly, contributing to the engine’s overall performance.

QSL Series

• QSL8.9 CM2150 L141
• QSL9 CM850 (CM2850)

The QSL series engines are engineered for heavy-duty applications, providing high power output and reliability. The Belt Tensioner 4936663 is compatible with these engines, ensuring that the serpentine belt maintains the correct tension, which is crucial for the engine’s efficient operation.

Conclusion

The Belt Tensioner 4936663 by Cummins is a versatile component that fits a wide range of Cummins engines, from the ISL, L, QSC, and QSL series. This compatibility ensures that the serpentine belt maintains the necessary tension, contributing to the engine’s performance and longevity. The role of this part in engine systems is to maintain optimal belt tension, which is vital for the efficient operation of engine-driven accessories and the refrigerant compressor. Proper maintenance and installation of the Belt Tensioner are essential for ensuring the reliability and efficiency of the engine system.