Genuine Cummins cylinder heads
What may appear similar to Genuine Cummins parts at a glance can perform very differently where it matters most, impacting consistency, durability and long-term reliability.
Cummins obtained 4 competitive cylinder heads and analyzed 35 unique part numbers that are part of the cylinder head assemblies. Several tests, including magnetic particle inspection, dimensional measurement, material analysis, 3D scanning, and flow and leak testing, were performed, which revealed over 30 differences between the genuine and “will-fit” cylinder heads. 7 of these differences could be considered higher-risk impacts to performance and reliability.
Proven differences backed by testing
| Part name | Non-genuine finding | Risk | Potential impact |
|---|---|---|---|
| Cylinder head | Tensile strength 15% lower than minimum spec | High | Lower tensile strength could make cylinder head more susceptible to cracking |
| Cylinder head | Burned sand in coolant passage partially blocking holes to injector bore | High | Reduced coolant flow may lead to overheating and higher potential for combustion face cracking |
| Cylinder head | Sand in air intake passage | High | Introduction of sand into combustion chamber could cause premature wear on power cylinder, reducing engine lifespan |
| Intake & exhaust valves | No head seat facing weldment present | High | Premature valve wear and possible failure could occur, reducing maintenance intervals |
| Intake & exhaust valves | Lower nickel and higher carbon chemical composition | High | Material has lower fatigue strength at high temperature, which could result in valve cracking |
| Valve stem seal | Obsoleted design with no gas lip in valve stem seal | High | Could cause high blow-by and increase potential valve guide wear |
| Injector sleeve | Adhesive present not called for in Cummins print | High | Adhesive could leak after high temperature exposure during operation, resulting in potential fuel system damage |
*Based on Cummins lab testing of competitive ISX15 non-genuine cylinder heads against Cummins specifications. Potential impacts vary by application and operating conditions.
Investing in Genuine Cummins parts could unlock lasting advantages like:
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Greater reliability and longer component life
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More uptime and fewer unplanned repairs
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Maintained fuel efficiency
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Lower repair and ownership costs
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Consistent engine power and performance
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Reduced risk of major engine damage
The road doesn’t ease up. The work doesn’t wait. And every promise to a customer depends on an engine built to keep going. Genuine Cummins cylinder heads are engineered to deliver peak performance, cutting-edge technology, fuel economy, reliability and durability when your engine needs it most. Because when quality and peace of mind matter, Genuine Cummins cylinder heads help keep you moving forward.
