3931623
Valve Tappet
Cummins®

Introduction

The Cummins 3931623 Valve Tappet is a component designed for use in heavy-duty truck engines. Its purpose is to facilitate the actuation of engine valves, ensuring precise timing and efficient operation of the engine. The significance of this valve tappet lies in its role in maintaining the performance and reliability of the truck’s engine under demanding conditions.

Basic Concepts of Valve Tappets

A valve tappet, also known as a lifter, is a mechanical device used in internal combustion engines to transfer motion from the camshaft to the valves. It plays a role in the valvetrain system by ensuring that the valves open and close at the correct times in the engine cycle. The tappet interacts directly with the camshaft lobes and, in turn, actuates the pushrods or rocker arms that control the valves. This precise timing is essential for the engine’s efficiency and performance ¹.

Role of the 3931623 Valve Tappet in Truck Operation

The Cummins 3931623 Valve Tappet contributes to the operation of a truck engine by providing a reliable means of valve actuation. It ensures that the valves open and close in sync with the engine’s operation, which is vital for maintaining combustion efficiency and overall engine performance. By facilitating smooth and consistent valve movement, the 3931623 Valve Tappet helps to optimize the engine’s power output and fuel efficiency ².

Key Features of the 3931623 Valve Tappet

The Cummins 3931623 Valve Tappet is characterized by several key features that enhance its functionality. It is constructed from high-quality materials to withstand the high stresses and temperatures encountered in heavy-duty truck engines. The design of the tappet includes precision machining to ensure accurate valve actuation. Additionally, it may incorporate features such as anti-rotation pins or coatings to reduce friction and wear, contributing to its durability and performance ³.

Benefits of Using the 3931623 Valve Tappet

Utilizing the Cummins 3931623 Valve Tappet offers several benefits. It contributes to improved engine efficiency by ensuring precise valve timing and actuation. The durable construction and design characteristics of the tappet enhance the engine’s reliability and longevity. Furthermore, the reduced friction and wear associated with its use can lead to lower maintenance requirements and extended service intervals.

Troubleshooting and Maintenance Suggestions

To maintain optimal performance of the Cummins 3931623 Valve Tappet, regular inspection and maintenance are recommended. This includes checking for signs of wear or damage, ensuring proper lubrication, and addressing any unusual noises that may indicate issues with the valvetrain. Troubleshooting common problems may involve adjusting valve clearances or replacing worn components to restore efficient operation. Adhering to manufacturer-recommended maintenance schedules can help prolong the lifespan of the valve tappet and ensure consistent engine performance.

Cummins: A Brief Overview

Cummins Inc. is a global power leader that designs, manufactures, and distributes engines, filtration, and power generation products. With a history of innovation and a strong reputation in the industry, Cummins is committed to producing high-quality automotive components that meet the demanding requirements of heavy-duty applications. The company’s dedication to excellence is reflected in its wide range of products, including the Cummins 3931623 Valve Tappet, which is designed to deliver reliable performance in challenging environments.

Valve Tappet 3931623 Compatibility with Cummins Engines

The Valve Tappet 3931623, manufactured by Cummins, is a critical component in the valve train system of various Cummins engines. This part is designed to ensure precise valve operation, contributing to the engine’s overall performance and longevity. Below is a detailed description of the engines with which this valve tappet is compatible.

Compatible Engines

• 4B3.9
• 6B5.9
• 6C8.3
• B3.9 G
• B4.5
• B4.5 RGT
• B5.9 CM2670 B166C
• B5.9 G
• B5.9 GAS PLUS CM556
• B6.7S
• C GAS PLUS CM556
• C8.3 G
• G5.9
• G5.9 CM558
• G8.3
• ISB3.9 CM2220 B107
• ISB5.9 CM2880 B127
• ISB5.9G CM2180
• L9.3 L105
• QSB3.9 30 CM550
• QSB3.9 CM2880 B138
• QSB5.9 30 CM550
• QSB5.9 CM2880 B139
• QSB5.9 CM550
• QSB5.9G

Grouped Compatibility

The Valve Tappet 3931623 is engineered to fit seamlessly into a wide range of Cummins engines, ensuring optimal valve operation across different engine configurations.

• 3.9 Liter Engines

  • 4B3.9
  • B3.9 G
  • ISB3.9 CM2220 B107
  • QSB3.9 30 CM550
  • QSB3.9 CM2880 B138

• 4.5 Liter Engines

  • B4.5
  • B4.5 RGT

• 5.9 Liter Engines

  • 6B5.9
  • B5.9 CM2670 B166C
  • B5.9 G
  • B5.9 GAS PLUS CM556
  • G5.9
  • G5.9 CM558
  • ISB5.9 CM2880 B127
  • ISB5.9G CM2180
  • QSB5.9 30 CM550
  • QSB5.9 CM2880 B139
  • QSB5.9 CM550
  • QSB5.9G

• 6.7 Liter Engines

  • B6.7S

• 8.3 Liter Engines

  • 6C8.3
  • C8.3 G
  • G8.3

• 9.3 Liter Engines

  • L9.3 L105

• Gas Plus Engines

  • C GAS PLUS CM556
  • B5.9 GAS PLUS CM556
  • QSB5.9G

This comprehensive compatibility ensures that the Valve Tappet 3931623 can be utilized across a broad spectrum of Cummins engines, providing a reliable solution for maintaining and enhancing engine performance.

Role of Part 3931623 Valve Tappet in Engine Systems

The part 3931623 Valve Tappet is an essential component in the valve train mechanism of an engine. It interfaces directly with the camshaft and the valve system to ensure precise and efficient operation of the engine’s intake and exhaust valves.

Interaction with the Camshaft and Cam

The Valve Tappet sits between the camshaft and the valve system. As the camshaft rotates, the cam lobes push against the Valve Tappet. This action transfers the motion from the camshaft to the Valve Tappet, initiating the opening and closing cycle of the valves.

Coordination with the Follower

In many engine designs, the Valve Tappet works in conjunction with a follower. The follower may be a roller or a flat surface that contacts the Valve Tappet. This arrangement reduces friction and wear, allowing for smoother operation and longer component life.

Integration with the Cylinder Head and Block

The Valve Tappet is housed within the cylinder head or the cylinder block, depending on the engine design. Its primary function is to transmit the motion from the camshaft to the valves, which are also located in the cylinder head. This ensures that the valves open and close at the correct times in sync with the piston’s movement within the cylinder.

Role in the Short Block and Long Block

In a short block configuration, which includes the crankshaft, cylinder block, and often the cylinder head, the Valve Tappet is a key component that ensures the valves operate correctly. In a long block, which adds components like the camshaft kit and followers, the Valve Tappet plays an even more significant role. It ensures that the complex interactions between the camshaft, followers, and valves are harmonized for optimal engine performance.

Importance in Crankshaft and Bearings Setup

The precise timing and operation of the valves, facilitated by the Valve Tappet, are vital for the efficient functioning of the crankshaft and its bearings. Proper valve timing ensures that the air-fuel mixture enters the cylinder at the right moment and that exhaust gases are expelled efficiently, reducing stress on the crankshaft and its supporting bearings.

Function in Camshaft Kit

When part of a camshaft kit, the Valve Tappet must be compatible with the specific cam profile. The Valve Tappet must accurately transmit the cam’s motion to the valves, ensuring that the engine’s performance characteristics—such as power, torque, and efficiency—are met as designed.

Conclusion

In summary, the part 3931623 Valve Tappet is a pivotal component that ensures the smooth and efficient operation of the valve train in various engine configurations, from short blocks to comprehensive long blocks. Its role in transmitting motion from the camshaft to the valves is fundamental to the engine’s overall performance and reliability.