| Mercedes-Benz OM647 engine | |
| Manufacturer: | Mercedes-Benz |
| Configuration: | Straight-5 |
| Production: | 2002–2006 |
| Predecessor: | Mercedes-Benz OM612 engine |
| Bore: | 88mm |
| Stroke: | 88.3mm |
| Displacement: | 2687cc |
| Block: | Cast-iron |
| Head: | Aluminum |
| Valvetrain: | DOHC 4 valves x cyl. |
| Turbocharger: | With intercooler |
| Fuelsystem: | Common rail direct injection |
| Fueltype: | Diesel |
| Coolingsystem: | Water-cooled |
| Power: | 1770NaN0 @ 4200 rpm |
| Torque: | 400 Nm @ 1800 rpm |
| Compression: | 18:1 |
The Mercedes-Benz OM647 engine is a straight-5 diesel engine produced by Mercedes-Benz.
This engine utilizes a cast-iron cylinder block and an aluminum cylinder head. The engine is turbocharged and intercooled. This engine also has four valves per cylinder and dual overhead camshafts.
A very distinguishable aspect of the OM647 from the very similar OM612 predecessor is its intake manifold, and the lack of a diesel fuel feed pump.