3939100
Dipstick
Cummins®

Introduction

The Cummins 3939100 Dipstick is a component designed for use in commercial trucks equipped with Cummins engines. Its purpose is to facilitate the measurement of oil levels within the engine, ensuring that the lubrication system operates within the manufacturer’s specified parameters. This part plays a role in the maintenance and operational efficiency of commercial trucks, contributing to engine longevity and performance ¹.

Basic Concepts of a Dipstick

A dipstick is a simple yet vital tool used in internal combustion engines to check the level of various fluids, primarily 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 has markings that indicate the minimum and maximum oil levels. By withdrawing the dipstick and observing the oil level against these markings, one can determine if the oil level is within the acceptable range ².

Purpose of the Cummins 3939100 Dipstick

The Cummins 3939100 Dipstick is specifically engineered to measure the oil level in Cummins engines found in commercial trucks. It ensures that the engine maintains an adequate supply of oil for lubrication, cooling, and cleaning purposes. Proper oil levels are important for reducing friction between moving parts, dissipating heat, and carrying away contaminants, thereby supporting the engine’s efficiency and durability ³.

Key Features

The Cummins 3939100 Dipstick is characterized by its robust design and construction from high-quality materials, ensuring durability and accuracy. It features clear, easy-to-read markings for oil level indication and is designed to withstand the harsh conditions typical of commercial truck operations. Its precise engineering allows for accurate fluid level readings, which are important for maintaining engine health.

Benefits

Utilizing the Cummins 3939100 Dipstick offers several advantages. Its design ensures accurate measurement of oil levels, which is vital for engine maintenance. The dipstick’s durability means it can withstand the rigors of commercial truck use, reducing the need for frequent replacements. Additionally, its ease of use allows for quick and efficient oil level checks, facilitating routine maintenance and helping to prevent engine damage due to low oil levels.

Installation and Usage

To install and use the Cummins 3939100 Dipstick, first, ensure the truck is on level ground and the engine is cool. Locate the dipstick tube, usually found near the engine’s center. Pull out the dipstick, wipe it clean with a lint-free cloth, reinsert it fully, and then pull it out again to check the oil level. The oil should be between the minimum and maximum marks. If the level is low, add the recommended type of oil until it reaches the appropriate level.

Troubleshooting and Maintenance

Common issues with dipsticks include inaccurate readings due to contamination or damage. Regularly cleaning the dipstick and inspecting it for wear can help maintain its accuracy. If the dipstick appears bent or damaged, it should be replaced to ensure reliable oil level readings. Routine maintenance of the dipstick and adhering to the manufacturer’s guidelines for oil changes and levels can contribute to the engine’s longevity and performance.

Cummins 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 commitment to quality, Cummins has established a reputation for reliability and performance in the automotive and heavy-duty truck industries. The company’s dedication to advancing technology and meeting the needs of its customers underscores its position as a leader in the field.

Compatibility with Cummins Engines

The Cummins part number 3939100, a Dipstick, is designed to be compatible with a range of Cummins engines. Specifically, it fits with the 6B5.9 engine. This part is essential for checking the oil level in the engine, ensuring that the engine operates smoothly and efficiently.

For the QSB5.9 30 CM550 engine, the Dipstick part number 3939100 is also applicable. This engine, known for its robust performance, benefits from the use of this dipstick to maintain optimal oil levels, which is crucial for its longevity and performance.

Both the 6B5.9 and QSB5.9 30 CM550 engines rely on the accurate measurement of oil levels provided by the Dipstick part number 3939100. This ensures that the engines are well-maintained and operate within their designed parameters.

Role of Part 3939100 Dipstick in Engine Systems

The part 3939100 dipstick is an important component in the maintenance and operation of engine systems. It works in conjunction with several other components to ensure the engine operates efficiently and remains in optimal condition.

Interaction with the Oil Level System

The dipstick is primarily used to measure the oil level within the engine. It is inserted into the oil filler tube, which is connected to the oil pan. When the dipstick is removed, the oil level can be observed directly on the stick, providing a quick and reliable method for checking the amount of oil present in the engine. This is vital for preventing oil starvation, which can lead to severe engine damage.

Connection to the Oil Gauge

In some engine systems, the dipstick may also interact with an oil gauge. The gauge provides a more precise reading of the oil level, often through electronic sensors that detect the oil level and transmit this information to the vehicle’s dashboard. The dipstick, in this case, serves as a manual backup to ensure that the oil level can still be checked even if the electronic system fails.

Ensuring Proper Lubrication

By accurately measuring the oil level, the dipstick helps maintain proper lubrication of the engine’s moving parts. Adequate lubrication is necessary to reduce friction and wear, enhance engine performance, and prolong the engine’s lifespan. Regular checks using the dipstick allow for timely top-ups, ensuring that the engine always has sufficient oil.

Facilitating Maintenance and Diagnosis

The dipstick also plays a role in routine maintenance and diagnostic procedures. Mechanics often use the dipstick to check the condition of the oil. The color and consistency of the oil on the dipstick can indicate whether the oil needs to be changed or if there are contaminants present that could harm the engine. This visual inspection is a quick diagnostic tool that can prevent more serious issues down the line.

Conclusion

In summary, the Cummins 3939100 Dipstick is a fundamental component in engine systems, working alongside the oil level system and, in some cases, the oil gauge to ensure the engine remains well-lubricated and in good working condition. Its role in maintaining proper oil levels is crucial for the longevity and performance of Cummins engines in commercial trucks.