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QSB6.7/QSB7 for Marine

Overview

QSB6.7/QSB7 for Marine184-405 kW | 247-542 hp
  • 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
  • Built at Darlington Engine Plant in Darlington, U.K. and Rocky Mount Engine Plant in Rocky Mount, NC, U.S

Specifications

Configuration

In-line, 6-cylinder, 4-stroke diesel

Aspiration

Turbocharged / Aftercooled

Displacement

6.7 L (408 in3)

Bore & Stroke

107 X 124 mm (4.21 X 4.88 in)

Rotation

Counterclockwise facing flywheel

Fuel System

High Pressure Common Rail



Product Dimensions and Weight

Overall Length

mm (in)

1263.8

(49.76)

Length of Block

mm (in)

748.0

(29.45)

Overall Width

mm (in)

910.6

(35.85)

Overall Height

mm (in)

857.0

(33.74)

Weight

kg (lb)

658

(1450)

Dimensions may vary based on selected engine configuration.

             
       
        

Engine Finder Specifications

Markets
Certification Level Tier 3 / Stage IIIA
IMO Tier II
RCD 1
Power 230 - 550 hp / 172 - 410 kW
Torque 720 - 1250 lb-ft / 976 - 1695 N•m

Ratings

Recreational Marine Propulsion Engines (Variable Speed Ratings)

Engine Model

kW

MHP

BHP

Engine Speed (RPM)

Rating Definition

Emissions

QSB6.7

184

250

247

2600

High Output

IMO 2 | EPA 3 | RCD 2

QSB6.7

224

305

301

2600

High Output

IMO 2 | EPA 3 | RCD 2

QSB6.7

261

355

350

2800

High Output

IMO 2 | EPA 3 | RCD 2

QSB6.7

279

380

375

3000

High Output

IMO 2 | EPA 3 | RCD 2

QSB6.7

312

425

419

3000

High Output

IMO 2 | EPA 3 | RCD 2

QSB6.7

353

480

473

3300

High Output

IMO 2 | EPA 3 | RCD 2

QSB6.7

405

550

542

3300

High Output

IMO 2 | EPA 3 | RCD 2

 

Commercial and Government Marine Propulsion Engines (Variable Speed Ratings)

Engine Model

kW

MHP

BHP

Engine Speed (RPM)

Rating Definition

Emissions

QSB6.7

169

230

227

3000

Intermittent

IMO 2 | EPA 3 | EU 3a

QSB6.7

184

250

247

2600

Heavy Duty

IMO 2 | EPA 3 | EU 3a

QSB6.7

224

305

301

2600

Medium Continuous

IMO 2 | EPA 3 | EU 3a

QSB6.7

261

355

350

2800 (HX)
3000 (KC)

Intermittent

IMO 2 | EPA 3 | EU 3a

QSB6.7

280

380

375

3000

Intermittent

IMO 2 | EPA 3 | EU 3a

QSB6.7

312

425

419

3000

Intermittent

IMO 2 | EPA 3 | EU 3a

QSB6.7

353

480

473

3000

Intermittent

IMO 2 | EPA 3 | EU 3a

QSB6.7

353

480

473

3300

Government Services

IMO 2 | EPA 3 | EU 3a

QSB6.7

404

550

542

3300

Government Services

IMO 2 | EPA 3 | EU 3a

 

Marine Auxiliary Engines (Fixed Speed Ratings)

Engine Model

kW

MHP

BHP

Engine Speed (RPM)

Rating Definition

Emissions

QSB7-DM

98

134

132

1800 (60 Hz)

Prime Power

IMO 2 | EPA 3

QSB7-DM

112

152

150

1800 (60 Hz)

Prime Power

IMO 2 | EPA 3

QSB7-DM

122

166

164

1500 (50 Hz)

Prime Power

IMO 2 | EPA 3 | EU 3a

QSB7-DM

130

176

174

1800 (60 Hz)

Prime Power

IMO 2 | EPA 3

QSB7-DM

142

193

190

1800 (60 Hz)

Prime Power

IMO 2 | EPA 3

QSB7-DM

164

223

220

1500 (50 Hz)

Prime Power

IMO 2 | EPA 3 | EU 3a

QSB7-DM

186

254

250

1800 (60 Hz)

Prime Power

IMO 2 | EPA 3

QSB7-DM

210

286

282

1800 (60 Hz)

Prime Power

IMO 2 | EPA 3


For more information on marine ratings, click here. For more on marine emissions information, click here.

Features

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 information 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. 

Brochures Available

Title Bulletin Number Request View  
C Command Electronic Information System Brochure 4082006 Request View  Download
C Command Electronic Information System Brochure – A4 Format 5410605 View  Download
Commercial And Government Marine Diesel Engines Brochure With Spec Sheet Inserts 4087294 Request View  Download
Cummins Care Marine Flyer 4087307 Request View  Download
Cummins Inboard Joystick Flyer 4087327 Request View  Download
Cummins Zeus Pod Propulsion Sales Sheet 4087291 Request View  Download
Marine Commercial Transport Brochure 4082096 Request View  Download
Marine Defense Brochure 4087453 Request View  Download
Marine Defense Brochure – A4 Format 4087463 View  Download
Marine Defense Strategy Flyer 4087454 View  Download
Marine Defense Strategy Flyer - A4 Format 4087464 View  Download
Marine Products Guide 3381946 Request View  Download
QSB6.7 Commercial Marine Spec Sheet 4087433 View  Download
QSB6.7 Commercial Spec Sheet - A4 Format 4986138 View  Download
QSB6.7 Quantum Series Engine for Recreational Applications Spec Sheet 4087252 Request View  Download
QSB6.7 Quantum Series Engine for Recreational Applications Spec Sheet - A4 format 4087455 View  Download
Quantum Series ReCon Engines Flyer 2878914 Request View  Download
Recreational Marine Diesel Engines Brochure With Spec Sheet Inserts 4087293 Request View  Download

Technical Documents Available

Title Bulletin Number View  
C Command HD Elite Plus Wiring Diagram 5272052 View  Download
C Command HD Wiring Diagram 5262653 View  Download
DTS (SmartCraft 2.2) System Architecture & Option Overview Diagram 4082046 View  Download
DTS (SmartCraft 2.2) Wiring Diagram 4082050 View  Download
Non-DTS (SmartCraft 2.2) System Architecture & Option Overview Diagram 4082047 View  Download
Preliminary Non-DTS (SmartCraft 2.2) Wiring Diagram 4082051 View  Download
QSB6.7 GS Marine Performance Curve 353 kW (480 hp) @ 3300 RPM (EPA Tier 3) M-94128 View  Download
QSB6.7 GS Marine Performance Curve 404 kW (550 hp) @ 3300 RPM (EPA Tier 3) M-94126 View  Download
QSB6.7 HD (SW) Marine Performance Curve 184 kW (250 hp) @ 2600 RPM (EPA Tier 3) M-93960 View  Download
QSB6.7 HD Marine Performance Curve 184 kW (250 hp) @ 2600 RPM (EPA Tier 3) M-93962 View  Download
QSB6.7 HO Marine Performance Curve 184 kW (250 hp) @ 2600 RPM (EPA Tier 3) M-93858 View  Download
QSB6.7 HO Marine Performance Curve 224 kW (305 hp) @ 2600 RPM (EPA Tier 3) M-93959 View  Download
QSB6.7 HO Marine Performance Curve 280 kW (380 hp) @ 3000 RPM (EPA Tier 3) M-94131 View  Download
QSB6.7 HO Marine Performance Curve 313 kW (425 hp) @ 3000 RPM (EPA Tier 3) M-94129 View  Download
QSB6.7 HO Marine Performance Curve 353 kW (480 hp) @ 3300 RPM (EPA Tier 3) M-94127 View  Download
QSB6.7 HO Marine Performance Curve 404 kW (550 hp) @ 3300 RPM (EPA Tier 3) M-94125 View  Download
QSB6.7 INT Marine Performance Curve 280 kW (380 hp) @ 3000 RPM (EPA Tier 3) M-94132 View  Download
QSB6.7 INT Marine Performance Curve 313 kW (425 hp) @ 3000 RPM (EPA Tier 3) M-94130 View  Download
QSB6.7 INT Marine Performance Curve 353 kW (480 hp) @ 3000 RPM (EPA Tier 3) M-95035 View  Download
QSB6.7 Marine Engine General Datasheet D31-MX-1 View  Download
QSB6.7 Marine Performance Curve 169 kW (230 hp) @ 3000 RPM (EPA Tier 3) M-94135 View  Download
QSB6.7 Marine Performance Curve 261 kW (355 hp) @ 2800 RPM (EPA Tier 3) M-94375 View  Download
QSB6.7 Marine Performance Curve 261 kW (355 hp) @ 3000 RPM (EPA Tier 3) M-94133 View  Download
QSB6.7 Marine Propulsion 355-550 hp Installation Drawing 4954063 View  Download
QSB6.7 MCD (SW) Marine Performance Curve 224 kW (305 hp) @ 2600 RPM (EPA Tier 3) M-93961 View  Download
QSB6.7 MCD Marine Performance Curve 224 kW (305 hp) @ 2600 RPM (EPA Tier 3) M-93963 View  Download
QSB6.7 Propulsion 230-305 hp Marine Installation Drawing 4954074 View  Download
QSB6.7 w/ Zeus Drive Marine Installation Drawing 4954000 View  Download
QSB6.7 w/ Zeus Drive Marine Installation Drawing 4954001 View  Download
QSB6.7 w/ Zeus Drive Marine Installation Drawing 4954002 View  Download
QSB6.7 w/ Zeus Drive Marine Installation Drawing 4954003 View  Download
QSB6.7 w/ Zeus Drive Marine Installation Drawing 4954004 View  Download
QSB6.7 w/ ZF85A Marine Installation Drawing 4953999 View  Download
QSB6.7 w/ ZF85IV Marine Installation Drawing 4953998 View  Download
QSB6.7/QSB7 Subsystem Marine Installation Drawing 4953945 View  Download
QSB7-DM Marine Performance Curve 112 kW (150 hp) @ 1800 RPM DM-93772 View  Download
QSB7-DM Marine Performance Curve 122 kW (164 hp) @ 1500 RPM DM-93775 View  Download
QSB7-DM Marine Performance Curve 130 kW (174 hp) @ 1800 RPM DM-93776 View  Download
QSB7-DM Marine Performance Curve 142 kW (190 hp) @ 1800 RPM DM-93771 View  Download
QSB7-DM Marine Performance Curve 164 kW (220 hp) @ 1500 RPM DM-93774 View  Download
QSB7-DM Marine Performance Curve 186 kW (250 hp) @ 1800 RPM DM-93766 View  Download
QSB7-DM Marine Performance Curve 210 kW (282 hp) @ 1800 RPM DM-93215 View  Download
QSB7-DM Marine Performance Curve 98 kW (132 hp) @ 1800 RPM DM-93773 View  Download
SmartCraft 1.0 System Architecture & Option Overview Diagram 4082056 View  Download
SmartCraft 2.5 DTS Marine Propulsion Wiring Diagram 4304664 View  Download
SmartCraft 2.5 Non-DTS Marine Propulsion Wiring Diagram 4304665-03 View  Download
SmartCraft 2.5 w/ Zeus Marine Propulsion Wiring Diagram 4304663 View  Download
Zeus (SmartCraft 2.1) System Architecture & Option Overview Diagram 4082043 View  Download
Zeus (SmartCraft 2.1) Wiring Diagram 4082045 View  Download
Zeus Helm Components Installation Drawing 4953822 View  Download