3908311
Dipstick
Cummins®

Introduction

The Cummins 3908311 Dipstick is a specialized component designed for use in commercial trucks equipped with Cummins engines. Its primary role is to facilitate the measurement of engine oil levels, which is vital for maintaining optimal engine performance and longevity. Proper lubrication is fundamental to the operation of any engine, and the dipstick serves as a straightforward yet effective tool in ensuring that lubrication systems function correctly ¹.

Basic Concepts of a Dipstick

A dipstick is a simple yet effective tool used in internal combustion engines to measure the level of engine oil. It consists of a long, thin metal or plastic rod with a handle at one end. The other end is inserted into the engine’s oil sump. The dipstick operates on the principle of capillary action, where oil rises along the dipstick to a certain level, indicating the amount of oil present in the sump. Users can then visually inspect the oil level and its condition by pulling out the dipstick and observing the oil mark ².

Purpose of the Cummins 3908311 Dipstick

The Cummins 3908311 Dipstick plays a role in the operation of a truck by providing a means to accurately measure the oil level within the engine. This measurement is crucial for ensuring that the engine components receive adequate lubrication, which helps in reducing friction, wear, and tear. Proper lubrication is key to maintaining engine efficiency and preventing damage. The dipstick allows for regular checks and timely top-ups or changes of the oil, contributing to the overall health and performance of the engine ³.

Key Features

The Cummins 3908311 Dipstick is designed with several features that enhance its performance and durability. It is constructed from high-quality materials to withstand the harsh conditions within an engine environment. The dipstick is engineered to provide accurate readings, with clear markings for oil level indicators. Its design ensures easy insertion and removal, facilitating convenient and safe use during maintenance checks.

Benefits

Using the Cummins 3908311 Dipstick offers several advantages. Its precise measurement capabilities ensure that the engine oil levels are maintained within the recommended range, promoting efficient engine operation. The ease of use and clear markings on the dipstick simplify the process of checking oil levels, making it accessible even for those with limited mechanical experience. Additionally, by ensuring proper lubrication, the dipstick contributes to the longevity of engine components, potentially reducing maintenance costs and enhancing the overall reliability of the truck.

Troubleshooting and Maintenance

Common issues with dipsticks may include inaccurate readings due to contamination or damage. Regular inspection of the dipstick for signs of wear, bending, or oil residue is recommended. Cleaning the dipstick with a clean cloth before reinserting it can help maintain accurate readings. If the dipstick shows signs of significant wear or damage, replacement is advised to ensure continued accurate oil level measurements.

Installation and Usage

To install and use the Cummins 3908311 Dipstick, follow these steps:

1. Ensure the engine is turned off and has had sufficient time to cool down.
2. Locate the dipstick tube, typically found on the side of the engine.
3. Remove the dipstick by pulling it straight out of the tube.
4. Wipe the dipstick clean with a lint-free cloth.
5. Reinsert the dipstick fully into the tube and then remove it again to check the oil level.
6. Observe the oil level marking on the dipstick and compare it to the recommended level indicated on the dipstick or in the truck’s manual.
7. If necessary, add oil to reach the recommended level.
8. Ensure the dipstick is reinserted fully after checking or adding oil.

Cummins Overview

Cummins Inc. is a global power leader that designs, manufactures, and distributes a wide range of power solutions, including engines, filtration, and power generation products. With a history spanning over a century, Cummins has established a strong reputation in the commercial truck industry for producing reliable and high-performance engines. The company’s commitment to innovation and quality has made it a preferred choice for commercial vehicle manufacturers and operators worldwide.

Cummins Engine Dipstick Compatibility

The Cummins part number 3908311, which is a Dipstick, is designed to be compatible with a range of Cummins engines. Specifically, this dipstick fits seamlessly with the following engine models:

• 4B3.9
• 6B5.9

These engines are part of a series that leverages Cummins’ robust engineering and performance standards. The dipstick’s design ensures it provides accurate readings of the engine oil level, which is crucial for maintaining optimal engine performance and longevity.

For the 4B3.9 and 6B5.9 engines, the dipstick’s fit is engineered to ensure ease of use and reliability. This compatibility is crucial for users who rely on these engines for various applications, from industrial use to heavy-duty transportation.

The dipstick’s design and material are chosen to withstand the operational conditions these engines typically encounter, ensuring durability and consistent performance over time.

Role of Part 3908311 Dipstick in Engine Systems

The part 3908311 dipstick is an essential component in the maintenance and monitoring of engine systems, specifically in relation to the oil level gauge. This dipstick serves as a direct interface between the engine’s lubrication system and the oil level gauge, facilitating accurate measurement and monitoring of the engine oil level.

When inserted into the engine’s oil filler neck, the dipstick allows for a physical check of the oil level. The oil adheres to the dipstick, providing a visual and tactile indication of the oil quantity within the engine. This information is then transferred to the oil level gauge, which interprets the data from the dipstick to display the current oil level to the user.

The dipstick’s design ensures that it fits snugly within the oil filler neck, preventing oil leaks and ensuring that the measurement is precise. The markings on the dipstick correspond to specific oil levels, allowing for easy interpretation by the user. This direct interaction between the dipstick and the oil level gauge is fundamental in maintaining the engine’s lubrication system, ensuring that the engine operates within safe parameters and preventing potential damage from oil starvation or overfilling.

Conclusion

The Cummins 3908311 Dipstick is a vital component for maintaining the health and performance of Cummins engines. Its design and features ensure accurate oil level measurements, contributing to the longevity and efficiency of the engine. Regular maintenance and proper use of this part are essential for optimal engine performance and reliability.