Search Within

Cummins QSB 6.7 Technical Specifications

QSB6.7 for Recreational Marine
  • Unmatched peformance driven through a perfectly matched turbocharger and a new 24-valve cylinder head that delivers industry-leading power density
  • Quiet operation, including an 80-percent reduction in noise at idle, is one of the many benefits from the common-rail fuel system
  • Enhanced sociability from the high-pressure common-rail design virtually eliminates smoke and improves the whole boating experience
  • Maximize vessel performance and access comprehensive vessel diagnostic information via SmartCraft® electronics
  • Peace of mind delivered by the Cummins Captain’s Briefing and global service network
View PDF Description Size Date
QSB 6.7 General Engine Data Sheet QSB 6.7 General Engine Data Sheet (640 KB) December 2013
QSB 6.7 Engine Bulletin QSB 6.7 Engine Bulletin (187 KB) October 2013
QSB 6.7 Cabin Heater Ports (147 KB) June 2014

Video: Cummins Recreational Marine: QSB6.7


All Performance Curves are EPA Tier 3

View PDF Model No. Rating Designation CPL Code Rated Speed (RPM) Curve No. Date
QSB 6.7 230 ID COMMERCIAL 3887 3000 M-94135 May 2013
QSB 6.7 250 HD COMMERCIAL 3887 2600 M-93960 May 2013
QSB 6.7 250 HD KC COMMERCIAL 3887 2600 M-93962 August 2013
QSB 6.7 250 HO RECREATIONAL 3887 2600 M-93858 May 2013
QSB 6.7 305 HO RECREATIONAL 3887 2600 M-93959 April 2013
QSB 6.7 305 MD COMMERCIAL 3887 2600 M-93961 May 2013
QSB 6.7 305 MD KC COMMERCIAL 3887 2600 M-93963 August 2013
QSB 6.7 355 ID COMMERCIAL 4191 2800 M-94375 October 2013
QSB 6.7 355 HO RECREATIONAL 4191 3000 M-94133 October 2013
QSB 6.7 380 HO RECREATIONAL 4191 3000 M-94131 October 2013
QSB 6.7 380 ID COMMERCIAL 4191 3000 M-94132 October 2013
QSB 6.7 425 HO RECREATIONAL 4191 3000 M-94129 October 2013
QSB 6.7 425 ID COMMERCIAL 4191 3000 M-94130 October 2013
QSB 6.7 480 HO RECREATIONAL 4191 3300 M-94127 October 2013
QSB 6.7 550 HO RECREATIONAL 4191 3300 M-94125 October 2013
View PDF Description Size Date
QSB 6.7 230-305 HP With Options (3,601 KB) April 2011
QSB 6.7 355-550 HP With Options (3,601 KB) April 2011
QSB 6.7 & ZF85IV (476 KB)
QSB 6.7 & ZF85A (471 KB)
QSB 6.7 & ZF286A (505 KB)
QSB 6.7 & ZF280A (481 KB)
QSB 6.7 & Konrad Drive (272 KB)
QSB 6.7 3D Model (1 KB)
Specifications
Configuration In-line 6-cylinder, 4-stroke diesel
Bore & Stroke 107 mm x 124 mm (4.21 in x 4.88 in)
Displacement 6.7 L (408 in3)
Aspiration Turbocharged / Aftercooled
Rotation Counterclockwise facing flywheel

Markets Marine
Certification Level Tier 3 / Stage IIIA
Power 380 - 480 hp / 284 - 358 kW
Torque 1000 - 1165 lb-ft / 1356 - 1580 Nm

Ratings
Rating HO/GS ID/HO ID/HO MD/HO HD/HO
Metric hp 480 425 380 305 250
bhp 473 419 375 295 246
KW 353 312 280 220 183
Rated rpm 3300 3000 3000 2600 2600
Max Torque ft-lbs 1165 1050 1000 TBD TBD
Max Torque N-m 1580 1424 1356 TBD TBD
rpm @ max torque 2000 2000 2000 TBD TBD

Features
Fuel System: Bosch HPCR with hardened components to safely operate alternative fuels such as kerosene and JP8/JP5

Lubrication System: Front mounted filters, LO service interval increased to 500 hours if use ULSD fuels

Electrical System: 12v and 24v, isolated and non-isolated, systems available

Air Intake System: New Walker air filter significantly reduces noise

Coolant System: Optional dry run capability

Emissions: EPA Tier 3, RCD and IM02

Breather System: Closed Crankcase Ventilation available on all ratings