| 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
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
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
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
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
