Cummins Tier 4 Engines for Marine

 

Mariners know best, so they choose the best.

 

The productivity of your marine operation largely depends on one factor: uptime. How much you get done — and when you get it done — can make or break your success. You need reliable power that not only gets the job done, but also keeps up with ever-changing emissions standards. With a combination of clean in-cylinder combustion and integrated Selective Catalytic Reduction (SCR) aftertreatment, the Cummins QSK38 and QSK60 engines meet both EPA Tier 4 Final and IMO Tier III emissions standards — without sacrificing one ounce of horsepower.

 

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JUMP TO: The New Standard  |  Service & Warranty

 

The clean power of Cummins Tier 4 lets you get more done.

  • Performance icon

    Built for performance

    The QSK Tier 4 Series delivers the same power as earlier models — with up to 5% fuel improvement. 

  • productivity icon

    Built for productivity

    No need for midlife / top-end overhaul. No need to change SCR bricks until a full overhaul is required. No unnecessary downtime.

  • Profitability icon

    Built for profitability  

    Reduced fluid consumption and a longer time to overhaul keep total cost of ownership low.

The New Standard

 

By adding SCR aftertreatment to our already-proven QSK series, you can invest time where it matters most: out on the water, not with a mechanic. Best of all, you won’t have to sacrifice one ounce of power.

QSK60

The base of the QSK60 uses components from the proven K19, K38 and K50 engines. A new steel piston with a PVD-coated top ring and a nitride-coated second ring provides excellent durability, withstands higher temperatures and meets stringent emission norms. 

The easy-to-install QSK60 aftertreatment eliminates midlife overhauls, delays component change-out until full overhaul and supports 500+ hours of operation before a fuel filter change is needed. The upgrade also provides: 

  • Lower Tier 4 engine and aftertreatment initial cost
  • Better overall total fluid consumption
  • Lower total cost of ownership 

QSK38

Also built using tried and tested components from our K19, K38 and K50 engines, the QSK38 features an updated cast-iron, ductile single-piece piston with nitride-coated rings and a hardened cylinder liner — for reliable power that matches previous models and keeps you compliant. 

The easy-to-install QSK38 aftertreatment eliminates midlife overhauls, delays component change-out until full overhaul and supports 500+ hours of operation before a fuel filter change is needed. The upgrade also provides:

  • Improved fuel consumption
  • Lower total cost of ownership 
  • Automatic catalyst health management without intervention

Local presence. Global reach.

Through a global network of 500 distributor and 7,500 dealer locations, our far-reaching presence guarantees a face-to-face interaction no matter where you are. Our engines and aftertreatment systems come with a full warranty backed by the power of our service network, ensuring fast access to support and engineering help when you need it.

 

Cummins is here to help

 

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