Cummins Genuine Parts - There is a Difference

For over 100 years, Cummins has been the industry’s #1 choice for new diesel engines, as well as the parts used to keep them operating reliably and efficiently for decades. The Genuine Cummins parts that you buy from a Cummins distributor or authorized dealer are built to our exact standards, meeting or exceeding original specifications on your QSK engine.

Today non-genuine parts suppliers develop parts that they think will fit your Cummins engine. While the initial savings can be enticing, oftentimes there are differences compared to the Genuine Cummins part that you may or may not be able to see with the naked eye. Your genuine part will perform the same or better than the original.

Non-Genuine Parts Fail to Measure Up

With Cummins, you can get both your propulsion engines and your auxiliary power from a single, reliable source. Your crew can use one set of diagnostic tools on all your engines. Any and every type of maintenance or service question can be answered by calling a single number – (1-800-CUMMINS), where our Cummins experts are available to lend assistance 24/7. It’s the complete package, one you can trust, whether you’re cruising the Greek islands or outrunning a tropical storm.


Differences You Can See & Those You Can’t

The Cummins R&D team performed rigorous testing on non-genuine parts compared to Genuine Cummins K-Series parts. Out of the total 278* non-genuine parts tested, not a single component met Cummins specifications. Cummins engineers tested 106* non-genuine different QSK-Series part numbers from a recognized supplier and put them through the same rigorous test procedures that we use to manufacture our own Genuine Cummins parts.

*Additional testing was recently completed that includes seals and gaskets analysis and is reflected in the revised quantity tested.  Due to the recent testing, the attached brochure does not include this new information.

Many failed on visual inspection. Some failed because the metal was either too soft (leading to early wear) or brittle (potential for cracking and downstream failure to other parts). While the parts tested failed for different reasons, the conclusion was simple: the non-genuine parts were simply not reliable.

Both the differences that you can see and those you can’t could cost you over time.


Saving $200 Could Cost You…

• Cost to prematurely replace parts or perform early overhauls
• Cost of additional fuel consumption
• Lost revenue from equipment downtime
• Costs related to inadequate service support
• Unwarranted failure cost

Simply put, Genuine Cummins parts and our service support network can help lower your Total Cost of Operation (TCO) and increase profitability of your QSK-powered equipment. When it comes to productivity, efficiency, uptime and profitability, there is a genuine difference. The proof is in the test results. Non-genuine parts simply can’t live up to the standards of Genuine Cummins parts. To get the most out of your engine and equipment, always specify Genuine Cummins parts. We earn your business by helping you earn more money.

Non-Genuine Part Inspection Results


Part Tested Measurement Inspection Material Inspection
Retaining Rings FAILED FAILED
Piston Compression Rings FAILED FAILED
Piston Oil Rings FAILED FAILED
Cylinder Liner FAILED FAILED
Exhaust Manifold Gasket FAILED FAILED
Cylinder Head Gasket FAILED FAILED
Rocker Housing Gasket FAILED FAILED
Other Gaskets and Seals FAILED FAILED

A total of 278 non-genuine parts were tested internally including multiple parts per component category.  Every part was measured and inspected compared to Genuine Cummins Part specifications and requirements. Testing results confirmed every part category failed in measurement or material inspection compared to Cummins standards

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