3678738 CUMMINS Seal Ring Set Qsx Liner Sleeve Piston Isx

Review CUMMINS 6x Seal Ring Set For Qsx Liner Sleeve Piston for ISX

Introducing the Cummins 3678738 6x Seal Ring Set, an essential component for maintaining the optimal performance of ISX, ISX15, QSX engine liners, sleeves, and pistons. This set is meticulously engineered to provide a perfect seal between various engine parts, ensuring the efficient transfer of combustion pressure and minimizing the potential for harmful leaks.

Each seal ring in this set is manufactured using high-quality materials, specifically designed to endure the extreme pressures and temperatures experienced within a diesel engine. The rings are precision-machined to ensure a snug fit and seamless installation, making this set a reliable solution for engine rebuild projects or routine maintenance.

The Cummins 3678738 Seal Ring Set includes six individual seal rings, each designed to serve a specific function within the engine. These rings include:

1. Compressor Seal Ring: This ring seals the clearance between the piston and the compressor side of the engine liner.

2. Oil Control Ring: Designed to control oil flow and prevent excessive oil consumption.

3. Oil Scraper Ring: This ring scrapes excess oil from the cylinder wall and directs it back into the crankcase.

4. Piston Ring: The piston ring set consists of two rings an upper and a lower which seal the combustion chamber and prevent combustion gases from leaking into the crankcase.

5. Wrist Pin Seal: This seal ensures a tight fit between the piston and the connecting rod.

6. Rod Seal: The rod seal prevents engine oil from leaking out between the piston and the crankshaft.

By utilizing this Cummins 3678738 Seal Ring Set, you can ensure the longevity and efficiency of your ISX, ISX15, or QSX engine. Each ring is designed to provide a precise seal, minimizing the potential for leaks and maximizing engine performance. Whether you're working on a rebuild project or performing routine maintenance, this set delivers the reliability and quality you've come to expect from Cummins.

Cummins 3678738 6x Seal Ring Set: A Comprehensive Analysis

The Cummins 3678738 6x Seal Ring Set is designed to fit various Cummins ISX, ISX15, and QSX engines. This seal ring set includes piston rings, liner sleeves, and piston rings seals. In this analysis, we will discuss the potential advantages and disadvantages of purchasing this seal ring set.

1. OEM Quality: This seal ring set is a genuine Cummins product. It is manufactured to meet the same specifications as the original equipment, ensuring a perfect fit and optimal engine performance.

2. Reduces Engine Wear: Worn or damaged seal rings can lead to increased engine wear, loss of compression, and poor fuel efficiency. Replacing these components with new ones can help reduce engine wear, extend engine life, and improve overall engine performance.

3. Eliminates Leaks: Leaking engine components can lead to costly repairs and downtime. The new seal rings in this set can help prevent leaks, saving you money in the long run.

1. Cost: This seal ring set can be quite expensive, especially when compared to aftermarket alternatives. However, it is important to consider that the OEM quality and fit of this product can result in long-term cost savings due to reduced engine wear and improved performance.

2. Installation Complexity: Installing the seal rings, liner sleeves, and piston rings can be a challenging process that requires specialized tools and expertise. It is recommended to have this work done by a professional mechanic to ensure proper installation and avoid potential damage to the engine.

The Cummins 3678738 6x Seal Ring Set offers several advantages, including OEM quality, reduced engine wear, and elimination of leaks. However, its high cost and installation complexity are potential drawbacks. Ultimately, the decision to purchase this seal ring set depends on your budget, engine requirements, and installation capabilities. If you prioritize OEM quality and optimal engine performance, this seal ring set is a worthwhile investment. If you are looking for a more cost-effective alternative, aftermarket seal ring sets may be a better choice.

If you own a Cummins ISX, ISX15, or QSX engine and are experiencing issues with worn seal rings or leaks, consider investing in the Cummins 3678738 6x Seal Ring Set. This OEM solution can help improve engine performance, extend engine life, and prevent costly repairs. If budget is a concern, research aftermarket alternatives to find a cost-effective solution that still meets your engine requirements. Regardless of your choice, always consult a professional mechanic for installation to ensure proper fitment and optimal engine performance.

Details:

These seals are a direct replacement for OE/oem part number 3678738, suitable engines made between 1998 -2017. The seals are easy to install and come in the color as pictured. Made by the trusted brand Cummins, this seal o ring set ensures a secure and reliable for your engine block, providing peace of mind vehicles performance. The product is a set of 6 seal o rings designed for Cummins Isx, Isx15, and qsx liner sleeve pistons.

specifications engineblocksam:

• for models: Isx
• brand: Cummins
• mpn: 3678738
• type: Seal O Ring
• model fitment: Fit For Cummins Isx Isx15 Qsx
• year: 1998-2017
• items included: Seal, 6 Seals
• color: As Pictures
• features: Easy Installation
• replacement type: Direct Replacement

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• city: bettsville, ohio
• # reviews: 4758
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• category: Auto Parts > Car Truck Accessories > Engines > Blocks

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• sold #: 9
• in stock #: 5
• options: ship-to-home
• prices: $13.88–$41.99
• item condition:
  • New
  • New – Open box
• availability: in stock
• started: february 14, 2026

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• paid by: seller
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• policy: returns accepted

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