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Cummins Releases 4.5 Litre Marine Engine for Recreational and Commercial Use Cummins recently announced a new 4.5-litre diesel engine for use in recreational and commercial marine applications. Built upon a proven, robust design, the new B4.5 marine engine boasts big power in a small package with low vibration, complying with EU Stage V, U.S. EPA Tier 3 emissions and regulations without the use of aftertreatment.

“The B4.5 may be the smallest marine engine offered by Cummins but it is a powerful solution for the marine industry,” remarked Stefano Unali, Sales Manager at Cummins Marine. “This new marine engine, based on the B4.5 industrial engine, has proven itself time and time again in
demanding applications, and yet is easy to service and operate.”

The in-line 4-cylinder, 16 valve, 4-stroke marine engine is easy to adapt to not only fit new builds but can easily replace outdated propulsion systems with a quieter, more environmentally friendly option. The B4.5 can accomplish all this and more thanks to several propulsion and
auxiliary engine options. These include ratings from 99-250 HP, a choice between keel cooled (KC) and heat exchanger (HX), and straight turbo or turbo after cooled models. In addition, the Cummins marine B4.5 meets genset requirements for the power range between 60kWe to 112kWe.

Since its launch, the B4.5 has experienced successful installations in both propulsion and auxiliary use, attracting excellent reviews from the crew of the field test vessels. The B4.5 has been deployed in various vessels such as tugboats, assisting in tasks such as shuttling fuel and dredging equipment around. Being one of the quietest engines of its range, combined with its small profile, one could be forgiven for forgetting the B4.5 is even there. However, once installed, the B4.5 has proved to be practically maintenance free.

The B4.5 is compatible with all the latest offerings from Cummins, including DockCommand inboard joystick, PrevenTech engine monitoring technology, and C Command, as well as 3rdparty controls and displays. The B4.5 is backed by a comprehensive a Cummins warranty and global service and support network.

Due to popular demand, Cummins is now accepting pre-production orders, with full production to commence in early 2022.

For more information on the new B4.5 engine as well as the complete line of marine solutions offered by Cummins, visit

About Cummins Inc.
Cummins Inc., a global power leader, is a corporation of complementary business segments that design, manufacture, distribute and service a broad portfolio of power solutions. The company’s products range from diesel, natural gas, electric and hybrid powertrains and powertrain-related components including filtration, after treatment, turbochargers, fuel systems, controls systems, air handling systems, automated transmissions, electric power generation systems, batteries, electrified power systems, hydrogen generation, and fuel cell products. Headquartered in Columbus, Indiana (U.S.), since its founding in 1919, Cummins employs approximately 57,800 people committed to powering a more prosperous world through three global corporate responsibility priorities critical to healthy communities: education, environment, and equality of opportunity. Cummins serves its customers online, through a network of company-owned and independent distributor locations, and through thousands of dealer locations worldwide and earned about $1.8 billion on sales of $19.8 billion in 2020. Learn more at

Exhibitor: Cummins UK

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