3973398
Lubricating Oil Pump
Cummins®

Introduction

The Cummins 3973398 Lubricating Oil Pump is a critical component in the operation of heavy-duty trucks. Its primary function is to circulate lubricating oil throughout the engine, ensuring that all moving parts receive adequate lubrication. This process is essential for maintaining engine efficiency, reducing wear and tear, and extending the lifespan of the engine ¹.

Basic Concepts of Lubricating Oil Pumps

Lubricating oil pumps are integral to an engine’s lubrication system. They work by drawing oil from the oil pan and distributing it under pressure to various engine components. There are several types of oil pumps, including gear pumps and rotor pumps, each designed to meet specific performance requirements ². The effectiveness of an oil pump directly influences engine performance and longevity, as proper lubrication minimizes friction and heat, which can lead to engine damage if not managed correctly.

Purpose and Role of the 3973398 Lubricating Oil Pump

The Cummins 3973398 Lubricating Oil Pump ensures that engine components are properly lubricated. It maintains consistent oil pressure, which is vital for the efficient functioning of the engine. By delivering oil to critical areas such as bearings, pistons, and camshafts, the pump helps to reduce friction and wear, supporting overall engine efficiency and reliability ³.

Key Features

The Cummins 3973398 Lubricating Oil Pump is designed with several key features that enhance its performance and reliability. Its construction includes high-quality materials that are resistant to wear and corrosion, ensuring durability in demanding environments. The pump’s design allows for efficient oil circulation, even under high-stress conditions, contributing to its effectiveness in heavy-duty applications.

Benefits of Using the 3973398 Lubricating Oil Pump

Using the Cummins 3973398 Lubricating Oil Pump offers several advantages. It provides improved engine protection by ensuring consistent lubrication, which helps to prevent wear and damage to engine components. The pump’s durable construction and reliable performance contribute to enhanced engine durability. Additionally, its efficiency can lead to potential cost savings through reduced maintenance requirements and extended engine life ⁴.

Troubleshooting and Maintenance Suggestions

To ensure optimal performance and longevity of the Cummins 3973398 Lubricating Oil Pump, it is important to be aware of common issues and perform regular maintenance. Common problems may include oil leaks, unusual noises, or fluctuations in oil pressure. Diagnostic procedures should be followed to identify the root cause of any issues. Maintenance practices, such as regular oil changes and inspections of the pump and its connections, are recommended to prevent problems and ensure the pump operates efficiently.

Installation and Compatibility

Proper installation of the Cummins 3973398 Lubricating Oil Pump is crucial for its performance and the overall health of the engine. Installation procedures should be followed carefully, including any specific requirements for ensuring compatibility with various truck models and engine types. Attention to detail during installation can prevent issues and ensure the pump functions as intended.

Performance Enhancements

The Cummins 3973398 Lubricating Oil Pump contributes to overall engine performance in several ways. By ensuring proper lubrication, it helps to maintain fuel efficiency, as reduced friction allows the engine to operate more smoothly. It also supports consistent power output by protecting engine components from wear. Additionally, efficient lubrication can contribute to emissions reduction by promoting cleaner engine operation.

Cummins Corporation Overview

Cummins Inc. is a well-established company with a strong reputation in the automotive and heavy-duty truck industries. Founded in 1919, Cummins has a long history of innovation and quality in engine manufacturing. The company offers a wide range of products, including engines, filtration systems, and power generation equipment, known for their reliability and performance. Cummins’ commitment to excellence is reflected in its products, including the 3973398 Lubricating Oil Pump.

Compatibility with Cummins Engines

The Cummins part number 3973398, which is a lubricating oil pump, is designed to fit seamlessly with several models of Cummins engines. This part is crucial for maintaining the proper lubrication within the engine, ensuring smooth operation and longevity.

ISB (Chrysler) Engines

The ISB (Chrysler) engine series benefits from the 3973398 oil pump, which is engineered to meet the specific lubrication needs of these engines. The ISB engines, known for their reliability and performance, require a robust oil pump to maintain optimal oil flow and pressure.

ISB CM850 Engines

The ISB CM850 engines also utilize the 3973398 oil pump. This particular model is designed to handle the unique demands of the CM850 configuration, ensuring that the engine operates efficiently under various conditions.

QSB5.9 CM850 Engines

The QSB5.9 CM850 engines are another series that is compatible with the 3973398 oil pump. This engine model, known for its versatility and power, relies on the oil pump to deliver consistent lubrication, which is essential for its performance and durability.

Grouping of Engines

The ISB and QSB5.9 CM850 engines share common design elements and lubrication requirements, making the 3973398 oil pump a suitable fit for both. This compatibility allows for easier maintenance and part replacement across these engine models, providing a streamlined approach to engine care.

Role in Engine Systems

The lubricating oil pump, identified by part number 3973398, is a critical component within the engine system, particularly when integrated with a long block or a long block kit.

In a long block assembly, which typically includes the engine block, crankshaft, pistons, connecting rods, camshaft, and valve train, the lubricating oil pump ensures that all these components receive adequate lubrication. This is achieved by circulating oil through the engine, reducing friction between moving parts, and dissipating heat.

When dealing with a long block kit, which may include additional components such as gaskets, seals, and sometimes even the oil pan, the lubricating oil pump plays a similarly vital role. It guarantees that the newly assembled or repaired engine maintains optimal lubrication from the outset, thereby enhancing the longevity and performance of the engine.

The efficient operation of the lubricating oil pump is fundamental in preventing wear and tear on the engine’s internal components. By maintaining a consistent oil flow, it helps in preserving the integrity of the crankshaft, pistons, and other critical parts within the engine block.

Conclusion

In summary, the Cummins 3973398 Lubricating Oil Pump is indispensable in ensuring that both the long block and long block kit function smoothly and efficiently, thereby contributing to the overall reliability and performance of the engine system.