70717
Fuel Pump Governor Shim
Cummins®

Introduction

The Fuel Pump Governor Shim 70717 is a critical component manufactured by Cummins, designed to optimize the operation of heavy-duty trucks. This shim is essential for the fuel injection system, ensuring the engine receives the precise amount of fuel needed for optimal performance. Cummins, a respected name in the automotive industry, produces this shim as part of its commitment to high-quality components for heavy-duty applications ¹.

Basic Concepts of Fuel Pump Governor Shims

A Fuel Pump Governor Shim is a thin, precision-machined washer that fits between the governor and the fuel pump in a diesel engine’s fuel injection system. Its primary function is to fine-tune fuel delivery by adjusting the governor’s spring pressure. This adjustment is crucial for maintaining the precise fuel delivery required for efficient engine operation. The shim helps calibrate the fuel pump to deliver the correct amount of fuel at various engine speeds and loads, ensuring the engine operates within its designed parameters ².

Role of the 70717 Fuel Pump Governor Shim

The 70717 Fuel Pump Governor Shim specifically contributes to the regulation of fuel flow within a truck’s fuel injection system. By fitting this shim, the governor’s response to changes in engine load and speed is adjusted, allowing for more accurate fuel delivery. This precise control over fuel flow is vital for maintaining engine performance, ensuring that the engine operates efficiently under a wide range of conditions. The shim’s role in this system is to provide a means of calibration that can be adjusted as needed to compensate for wear, changes in fuel quality, or other factors that may affect fuel delivery ³.

Key Features

The 70717 is characterized by its precise design and the high-quality materials used in its construction. These features contribute to its performance and durability. The shim is manufactured to tight tolerances, ensuring that it fits securely and functions as intended within the fuel injection system. Its material is chosen for its ability to withstand the high pressures and temperatures found in diesel engines, providing reliable operation over the life of the component.

Benefits

Utilizing the 70717 offers several advantages. It contributes to improved fuel efficiency by ensuring that the engine receives the optimal amount of fuel for its current operating conditions. This precise fuel delivery also enhances engine performance, allowing the engine to operate more smoothly and with greater power. Additionally, the shim’s reliable operation under various driving conditions helps to maintain consistent engine performance, reducing the likelihood of issues related to fuel delivery.

Troubleshooting and Maintenance

Common issues with the Fuel Pump Governor Shim may include improper fuel delivery, leading to symptoms such as rough idling, decreased fuel efficiency, or engine performance issues. Troubleshooting these problems may involve checking the shim’s fit and condition, ensuring that it is correctly installed and has not been damaged. Regular maintenance practices, such as inspecting the shim during routine engine service, can help to identify potential issues before they lead to more significant problems. Proper care and attention to the shim and the fuel injection system as a whole are key to ensuring optimal performance and longevity.

Compatibility with Cummins Engines

The 70717 is designed to fit a variety of Cummins engines, ensuring precise control over fuel delivery and engine performance. This shim is integral to the operation of the fuel pump governor, which regulates the amount of fuel injected into the engine, thereby affecting engine speed and power output.

K-Series Engines

• K19, K38, K50: These engines are known for their robust design and are often used in heavy-duty applications, where precise fuel management is crucial for maintaining optimal engine performance.

L-Series Engines

• L10 GAS, L10 MECHANICAL: These engines are designed for versatility, offering both gas and mechanical fuel systems, and the shim ensures that the fuel pump governor operates correctly in both configurations.

M-Series Engines

• M11 CELECT PLUS, M11 MECHANICAL: These engines are equipped with advanced electronic controls and mechanical robustness, and the shim plays a key role in maintaining the precision of the fuel pump governor.

N-Series Engines

• N14 MECHANICAL: This model is designed for high-performance applications, and the shim is essential for ensuring the fuel pump governor functions accurately under demanding conditions.

NH/NT 855 Engines

• Known for their durability and efficiency, these engines also incorporate the 70717 shim. This ensures that the fuel pump governor can adapt to the varying demands of these engines, providing consistent performance.

QSK19 CM500 Engine

• A high-output model, this engine relies on the 70717 shim to maintain the integrity of the fuel pump governor, ensuring that the engine can deliver its maximum power output reliably.

V-Series Engines

• V28, V903: These engines are designed for heavy-duty applications, and the shim is crucial for maintaining the precision of the fuel pump governor, ensuring that the engines can handle the rigors of demanding work environments.

Role of Part 70717 Fuel Pump Governor Shim in Engine Systems

The 70717 is an essential component in the fine-tuning and regulation of fuel delivery within various engine systems. This shim works in conjunction with several other components to ensure optimal performance and efficiency.

Integration with Fuel System Components

1. Fuel Code and Fuel C0de Systems:

   • The shim interacts with the fuel code and fuel c0de systems to maintain precise fuel metering. It helps in adjusting the fuel pump’s output to match the engine’s requirements under different operating conditions.

2. Dina Mexico Conv and Fueel Code:

   • In the Dina Mexico Conv and fueel code configurations, the shim ensures that the fuel pump operates within specified parameters, enhancing the engine’s responsiveness and fuel economy.

3. Governor Spring and Idle Spring Pack:

   • The shim works alongside the governor spring and idle spring pack to modulate the fuel pump’s performance. It provides the necessary adjustments to accommodate varying load conditions and maintain stable idle speeds.

Compatibility with Pump Code CPL Variants

• Pump Code CPL 0001, CPL 0003, CPL 10, CPL 144, CPL 161, CPL 174, CPL 218, CPL 22, CPL 62, CPL 70, CPL-0003, CPL-10, CPL-108, CPL-138, CPL-63, CPL183, CPL189:
  • Across these pump code CPL variants, the shim plays a role in fine-tuning the fuel delivery system. It ensures that each pump code configuration operates efficiently by providing the correct amount of fuel at the right pressure, thereby optimizing engine performance and reliability.

Functional Synergy

• The shim’s primary function is to provide the necessary clearance and adjustment between the fuel pump components. This ensures that the fuel pump governor can react promptly to changes in engine demand, thereby maintaining a consistent fuel supply.

• By working in harmony with the governor spring, idle spring pack, and various pump code CPL configurations, the shim contributes to the overall stability and efficiency of the fuel delivery system.

This detailed interaction underscores the importance of the shim in achieving precise fuel management and engine performance across different engine systems.

Conclusion

The 70717 Fuel Pump Governor Shim by Cummins is a vital component for ensuring precise fuel delivery and optimal engine performance in heavy-duty trucks. Its precise design, high-quality materials, and compatibility with various Cummins engines make it an indispensable part of the fuel injection system. Regular maintenance and proper installation of this shim are crucial for maintaining engine efficiency and reliability.