The 2.7-liter 5-cylinder in-line Mercedes OM647 engine was produced from 2002 to 2005 and was installed on the E-Class model in the W211 body and only on the pre-styling modification.
The diesel R5-family includes: OM617, OM602, OM605, OM612, OM647.
OM647 uses five cylinders. The engine is operated with a VGT or VNT turbocharger. The boost pressure is up to 1600 bar. There are 2 camshafts on the motor, the drive is carried out using a timing chain. There are 4 valves per cylinder, adjustable by pushers. There is an electronically controlled EGR valve. The control unit also controls the fuel pump, and the fuel is supplied metered.
Pre-injection, which means that a small portion of the fuel is burned before the main process. This makes it possible to heat the chamber, which contributes to a quick start and warm-up of the motor. Of course, the temperature regime and the pressure parameter are better maintained. Some modifications of these engines are equipped with a balance shaft rotating opposite the crankshaft at a higher speed.
Specifications
| Production years | 2002-2005 |
| Displacement, cc | 2685 |
| Fuel system | Common Rail |
| Power output, hp | 177 |
| Torque output, Nm | 400 |
| Cylinder block | cast iron R5 |
| Block head | aluminum 20v |
| Cylinder bore, mm | 88 |
| Piston stroke, mm | 88.3 |
| Compression ratio | 18.0 |
| Features | no |
| Hydraulic lifters | yes |
| Timing drive | chain |
| Phase regulator | no |
| Turbocharging | VGT |
| Recommended engine oil | 5W-40 |
| Engine oil capacity, liter | 6.5 |
| Fuel type | diesel |
| Euro standards | EURO 4 |
| Fuel consumption, L/100 km (for Mercedes E270 CDI 2003) — city — highway — combined |
9.1 5.1 6.5 |
| Engine lifespan, km | ~330 000 |
| Weight, kg | 215 |
The engine was installed on:
- Mercedes E-Class W211 in 2002 – 2005.
Disadvantages of the OM647 engine
- The main problems of this diesel engine are related to Common Rail fuel equipment.
- The reason for the airing of the system here is most often the drying of quick releases.
- It is necessary to change the refractory washers after dismantling the nozzles or they will coke.
- Due to soot, the dampers of the variable intake manifold geometry are often wedged.
- In terms of electrics, the camshaft position sensor and the crankshaft position sensor often fail here, and the injector wiring burns out.
