3945967
Pressure Regulator Plunger
Cummins®

The Pressure Regulator Plunger (part number 3945967), manufactured by Cummins, is a critical component in the fuel system of heavy-duty trucks. Cummins is renowned in the automotive industry for producing reliable and high-performance parts. This plunger is designed to ensure the efficient operation of the fuel system, contributing to the overall performance and efficiency of the truck’s engine.

Basic Concepts and Functionality

Pressure regulator plungers operate based on fundamental principles that involve controlling the flow and pressure of fuel within the system. These components adjust the pressure of the fuel delivered to the engine, ensuring it remains within specified parameters. This regulation is vital for maintaining consistent fuel pressure, which is necessary for optimal engine operation and fuel efficiency ¹.

Purpose of the Pressure Regulator Plunger

The Pressure Regulator Plunger plays a specific role in the truck’s fuel system by regulating fuel pressure. This regulation ensures that the engine receives a consistent supply of fuel, which is essential for maintaining engine performance and fuel efficiency. By stabilizing fuel pressure, the plunger helps achieve a balance between fuel delivery and engine demand, thereby enhancing the overall operation of the truck ².

Key Features

The design and construction of the Pressure Regulator Plunger incorporate several features that enhance its performance. Crafted from durable materials, this Cummins part is engineered to withstand the demanding conditions of heavy-duty truck operations. Its precision engineering ensures accurate fuel pressure regulation, while its robust construction contributes to its longevity and reliability in various operating environments ³.

Benefits

The Pressure Regulator Plunger offers several advantages, including improved fuel delivery and enhanced engine performance. By maintaining consistent fuel pressure, it contributes to more efficient engine operation and better fuel economy. Additionally, its reliable performance under demanding conditions ensures that heavy-duty trucks can operate efficiently and dependably, even in challenging environments ⁴.

Installation and Compatibility

Proper installation of the Pressure Regulator Plunger is crucial for ensuring its effective operation within the fuel system. It is designed to be compatible with various Cummins engine models and fuel system configurations, making it a versatile component for a wide range of heavy-duty truck applications. Following manufacturer guidelines for installation ensures optimal performance and compatibility with the truck’s fuel system ⁵.

Maintenance and Troubleshooting

Routine maintenance of the Pressure Regulator Plunger is important for ensuring its continued optimal performance. Regular inspection and cleaning can help prevent issues related to fuel pressure regulation. Troubleshooting common problems, such as inconsistent fuel pressure or engine performance issues, may involve checking the plunger for wear or damage and ensuring it is properly installed and functioning as intended.

Performance and Reliability

The Pressure Regulator Plunger has demonstrated reliable performance under various operating conditions. Empirical data and user feedback indicate that it contributes to stable fuel pressure regulation, which is vital for engine performance and fuel efficiency. Its durability and precision engineering are key factors in its reliable operation in the demanding environments typical of heavy-duty truck applications.

Cummins Corporation

Cummins Corporation is a renowned manufacturer in the automotive industry, with a history of producing high-quality components for heavy-duty trucks. The company’s reputation is built on its commitment to innovation, quality, and reliability. Cummins’ extensive range of products and solutions for the transportation industry underscores its position as a leader in the field, dedicated to enhancing the performance and efficiency of vehicles through superior component design and manufacturing.

Compatibility of Cummins Pressure Regulator Plunger 3945967

The Cummins Pressure Regulator Plunger (part number 3945967) is designed to regulate fuel pressure within the system, ensuring optimal engine performance and efficiency. Below is a detailed overview of the engines with which this part is compatible:

6 Series Engines

• 6B5.9
• 6C8.3
• C8.3 G
• G8.3
• G8.3 CM558
• GTA8.3 CM558

ISC Series Engines

• ISC CM2150
• ISC CM554
• ISC CM850
• ISC8.3 CM2250

ISL Series Engines

• ISL CM2150
• ISL CM554
• ISL G CM2180
• ISL9 CM2150 SN
• ISL9 CM2250
• ISL9.5 CM2880 L138

L Series Engines

• L GAS PLUS CM556
• L8.9
• L8.9 CM2670 L134C
• L8.9 L121
• L8.9G CMOH2.0 L125B
• L9 CM2670 L128B
• L9.3 L105
• L9.5 L117

Role of Part 3945967 Pressure Regulator Plunger in Engine Systems

The Pressure Regulator Plunger is an integral component in maintaining the precise pressure levels within various engine systems. Its function is to modulate and stabilize pressure, ensuring optimal performance and longevity of the engine components.

In the cylinder block and cylinder block kit, the Pressure Regulator Plunger works in conjunction with the lubricating oil pump kit to maintain consistent oil pressure. This is vital for the proper lubrication of moving parts, reducing friction and wear. The plunger interacts with the lubricating oil filter head and lubricating oil filter kit to ensure that the oil delivered is clean and at the correct pressure, enhancing the efficiency of the lubricating pump kit.

Within the fuel pump oil kit, the Pressure Regulator Plunger helps in regulating the fuel pressure, ensuring that the fuel system delivers the right amount of fuel to the engine under varying conditions. This interaction is essential for the efficient operation of the engine oil system.

In the oil filter cooler and cooler systems, the plunger assists in maintaining the temperature and pressure of the oil, which is crucial for the effective cooling of the engine. The head component benefits from this regulation as it ensures that the oil reaching the cylinder head is at the optimal temperature and pressure, preventing overheating and potential damage.

For the long block and short block assemblies, including the short block 6cart and short engine kit, the Pressure Regulator Plunger ensures that all moving parts receive consistent lubrication. This is particularly important in high-stress areas such as the repair kit components, where precise pressure regulation can prevent premature wear and failure.

Overall, the Pressure Regulator Plunger plays a significant role in the interplay between various engine components, ensuring that pressure levels are maintained within specified limits for optimal engine performance and durability.

Conclusion

The Pressure Regulator Plunger (part number 3945967) is a vital component in the fuel system of heavy-duty trucks, ensuring consistent fuel pressure and optimal engine performance. Its durable construction, precision engineering, and compatibility with various Cummins engine models make it a reliable and efficient choice for maintaining the performance and efficiency of heavy-duty truck engines.