| 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 |
- 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
- Peace of mind delivered by the Cummins Captain’s Briefing and global service network
Cabin Heater & Water Heater Connection Ports for QSB 6.7 & QSB 5.9
QSB 6.7 and QSB 6.7 Slimline Heater Supply Connection. Use coolant return elbow behind alternator for return connection. Read More
Adding a Power Steering Pump to a Cummins QSB 6.7 SL PTO
The Cummins factory was asleep on this one… “requires a customized Aftercooler and Transmission oil cooler mount to fit” — One full day in the shop to sort it out. V-10 Vickers pump 5-7 GPH Read More
Cummins Marine QSB High Fuel Pressure Fault & Alarm Troubleshooting
Fault Code: 449, 553, 2311 (SPN: 157) Injector Metering Rail Number 1 Pressure – Data Valid But Above Normal Operating Range – Most Severe Level. The ECM has detected that fuel pressure in the rail... Read More
Cummins Marine Fuel Filter Backing from Fuel Filter Head in Marine Applications (B4.5 & QSB 6.7 Engines)
After observing many occurrences of the on-engine fuel filters “dropping” off of the filter head on Cummins Marine QSB 6.7 and B4.5 engines, Cummins issued a Technical Service Bulletin (TSB) TSB240112 that both shows how... Read More
