1. Engine Rocker & Valve Covers Items
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  3. CUMMINS 3954996

CUMMINS 3954996 Tier Isb Qsb Engines 3969481 6.7 Isb/qsb/cm

3969481 Cummins 3954996 New Oem / - Tier 3 6.7 Liter Isb/qsb/cm Engines

( Brand: Cummins ), ( Manufacturer Part Number: 3954996 ), ( Part Type: Engine ), ( Core Charge: No ), ( Country/region Of Manufacture: United States )

Review CUMMINS New Oem Tier 6.7 Liter Isb/qsb/cm Engines

The Cummins ISB/QSB/CM Tier 4 Final/Tier 6.7 engines, specifically model numbers 3954996 and 3969481, represent the pinnacle of advanced engineering and technological innovation in the heavy-duty engine market. These powerful and efficient engines are designed to meet the stringent emissions regulations set forth by the Environmental Protection Agency (EPA) and the European Union (EU).

The ISB (In-Line Six-Bolt) and QSB (Quad-Bolt) variants of this engine family are six-cylinder models, renowned for their exceptional balance between power and fuel efficiency. They come equipped with Cummins' Advanced EGR (Exhaust Gas Recirculation) system, which effectively reduces nitrogen oxide (NOx) emissions without sacrificing performance. Additionally, the engines feature Selective Catalytic Reduction (SCR) technology, which utilizes a urea-based solution, such as AdBlue, to further minimize NOx emissions and meet the Tier 6.7 standards.

The ISB engines boast a displacement of 15.2 liters (939 cubic inches), while the QSB engines offer a slightly larger displacement of 15.3 liters (953 cubic inches). Both engine variants are capable of generating impressive torque figures, with the ISB delivering up to 1,850 lb-ft (2,500 Nm) and the QSB producing up to 1,700 lb-ft (2,300 Nm). This ample torque ensures reliable power delivery, even under heavy load conditions.

Moreover, these engines are characterized by their robustness and durability. They boast an advanced cooling system, which includes a large, efficient cooling fan and a heavy-duty radiator. This cooling system is capable of maintaining optimal engine temperatures, even in the most demanding operating environments. Furthermore, the engines' forged crankshafts and pistons, as well as their thick cylinder liners, are engineered to withstand the rigors of heavy-duty applications.

Additionally, the ISB/QSB/CM engines offer excellent fuel efficiency, thanks to their advanced combustion system and optimized engine design. This results in lower fuel consumption and reduced operating costs for fleet operators and owner-operators. The engines also feature a sophisticated electronic control system, which allows for seamless integration with vehicle automation and telematics systems.

In summary, the Cummins ISB/QSB/CM Tier 6.7 engines, model numbers 3954996 and 3969481, represent a powerful, efficient, and durable solution for heavy-duty applications. These engines meet the most stringent emissions regulations while delivering impressive power and torque figures, robust durability, and excellent fuel efficiency. They are designed to provide optimal performance under the most demanding operating conditions.

Cummins ISB/QSB/CM Tier 6.7 engines, with model numbers 395 and 396, are popular choices for heavy-duty applications due to their robustness and fuel efficiency. Here are some pros and cons to help you make an informed decision about purchasing one:

Pros:

1. Fuel Efficiency: These engines are known for their excellent fuel efficiency, which leads to lower operating costs.

2. Power and Torque: They offer impressive power output and torque, making them suitable for heavy-duty applications.

3. Durability: Cummins engines are renowned for their durability and long service life, which reduces the need for frequent repairs and maintenance.

4. Emission Compliance: These engines meet Tier 6.7 emission standards, which is required in many industries and regions.

5. Wide Range of Applications: ISB/QSB/CM engines are used in various industries, including construction, agriculture, mining, and transportation.

Cons:

1. Cost: The initial cost of purchasing a Cummins Tier 6.7 engine can be high due to their advanced technology and popularity.

2. Complexity: These engines have advanced technology and numerous components, which can increase the complexity of maintenance and repair.

3. Availability of Parts: Replacement parts for these engines may not be readily available in remote locations or developing countries.

4. Technical Expertise: Operating and maintaining these engines requires a certain level of technical expertise, which can be a challenge for some operators.

Conclusion:

Cummins ISB/QSB/CM Tier 6.7 engines offer several advantages, such as fuel efficiency, power and torque, durability, and emission compliance. However, they also come with some disadvantages, including a high initial cost, complexity, availability of parts, and the need for technical expertise. If you operate in an industry or application where these advantages outweigh the disadvantages, then a Cummins Tier 6.7 engine may be a worthwhile investment.

Recommendation:

If you are considering purchasing a Cummins ISB/QSB/CM Tier 6.7 engine, it is recommended that you thoroughly research the specific model and application requirements. Consider factors such as fuel efficiency, power output, torque, emission standards, maintenance and repair complexity, availability of parts, and technical expertise. It may also be beneficial to consult with a Cummins dealer or certified mechanic to better understand the specific benefits and challenges of the engine for your application.

Details:

NEW OEM CUMMINS 3954996 / 3969481 - Tier 3 6.7 liter ISB/QSB/CM engines,: : Comparable with:: QSB5.9 CM850 QSB6.7 CM2850: M CM2250 ISB CM850.

part #: 3954996 prices

  • $250.00-$3485.00

specifications rockercove:

  • brand: Cummins
  • mpn: 3954996
  • part type: Engine
  • core charge: No
  • country/region of manufacture: United States

returns rockercove:

  • policy: Returns Accepted
  • time: 30 Days
  • paid by: Seller

general rockercove:

  • condition: New
  • Engines Engine Parts > Valvetrain Components > Rocker Valve Covers

seller rockercove:

  • rating: 98.6%
  • # reviews: 2860
  • city: North Salt Lake, Utah

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offer rockercove:

  • options: Ship-to-home
  • quantity: 2
  • availability: In Stock
  • started: August 9, 2025
  • sold: 0

shipping rockercove:

  • class: Standard
  • cost: $0.00
  • transit: 4-9 Days
  • type: Fixed
  • service: Standard
part type: engine, core charge: no, country/region of manufacture: united states,
category: auto parts > engines engine parts > valvetrain components > rocker valve covers, sku: 8526432905219622,

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