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.
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.
Mercedes diesel R5 family: OM617, OM602, OM605, OM612, OM647.
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.
Frequently asked questions about the Mercedes OM647
How much power does the Mercedes OM647 make?
The Mercedes OM647 develops 177 hp and 400 Nm of torque.
How much oil does the Mercedes OM647 take and which one?
Engine oil capacity: 6.5 liters. Recommended oil: 5W-40.
Does the Mercedes OM647 have a timing belt or chain?
The Mercedes OM647 uses a timing chain.
Is the Mercedes OM647 turbocharged?
Yes, the Mercedes OM647 is turbocharged (VGT).
Does the Mercedes OM647 need valve clearance adjustment?
No, the Mercedes OM647 has hydraulic lifters, so the valve clearances do not need to be adjusted.
How long does the Mercedes OM647 last?
The typical lifespan of the Mercedes OM647 is ~330 000 km with proper maintenance.
What is the fuel consumption of the Mercedes OM647?
Mercedes E270 CDI 2003: city 9.1, highway 5.1, combined 6.5 L/100 km.
What cars was the Mercedes OM647 installed on?
Mercedes E-Class W211 in 2002 - 2005.
What are the common problems of the Mercedes OM647?
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. All known problems.
