Cummins Inc.
4500 Leeds Avenue – Suite 301Charleston, SC 29405-8539U.S.A.
Internet: marine.cummins
Bulletin 4087252  Rev. 10/15©2015 Cummins Inc.
resized
Cummins is a pioneer in product improvement. Thus specifications may change  without notice. Illustrations may include optional equipment.
QSB6.7
Marine Propulsion and Auxiliary Engines for Recreational Applications
Features and Benefits
Engine Design  – Unmatched performance driven
through a perfectly matched turbocharger and a new 24-valve cylinder head that delivers industry-leading power density. Maximize vessel performance and access comprehensive vessel diagnostic inf
ormation via SmartCraft ® electronics. Peace of mind delivered by the Cummins Captain’s Briefing and global service network
Fuel System  – Bosch HPCR with hardened
components to safely operate alternative fuels such as kerosene and JP8/JP5. Quiet operation, including an 80-percent reduction in noise at idle. Enhanced sociability virtually eliminates smoke and improves the whole boating experience.
Lubrication System  – Front-mounted filters. Oil service
interval increased to 500 hours if using ULSD fuels
Cooling System  – Single loop, low temperature
aftercooling eliminates the need for two keel coolers and lowers emissions. Tube and shell heat exchanger designed for superior durability and ease of service with minimal maintenance requirements. Fan drive available for radiator cooled configurations
Air Intake System  – New Walker air filter significantly
reduces noise
Exhaust System  – Cast water cooled exhaust
manifold for lower surface temperatures, safety and improved performance
Electrical System  – 12v and 24v, isolated and
non-isolated, systems available
Electronics  — 24v Quantum System electronics
feature a proven ECM to monitor operating parameters such as fuel consumption, duty cycle, engine load and speed, while providing diagnostics, prognostics and complete engine protection. Simplified electrical customer interface box for all vessel connections to reduce installation complexity
Certifications  – Complies with U.S. EPA Tier 3
emissions regulations without the use of aftertreatment. Designed to meet the International Association of Classification Societies (IACS) and SOLAS requirements. Consult your local Cummins professional for a complete listing of available class approvals.
Optional Equipment
■Engine Controls: Digital Throttle and Shift  ■Instrumentation: SmartCraft ® digital displays standard with Zeus ®, optional as inboard  ■Vessel System Integration: SmartCraft ® monitors fluid level, vessel range, depth, vessel speed, rudder position, temperatures and more  ■SL Option Package: a collection of options to reduce engine size and weight. Includes a resized cooling system, side mount filters, low mount turbocharger, disposable closed crankcase air cleaner, remote-manual fuel priming pump, steel oil pan and block mounted engine brackets. Available on the 355, 380 and 425 MHP ratings. Also available a la carte where compatible.

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