The Mercedes-Benz OM640 engine is a 2.0-liter in-line 4-cylinder diesel engine with common rail direct injection and turbocharger in various power ratings, manufactured by Mercedes-Benz Daimler AG.
Compared to the previous generation OM668 engines (A160CDI and A170CDI), the power and torque of the new A160 CDI and A180 CDI diesels have increased by 5 kW, 10 kW and 20 Nm, 70 Nm, respectively. This increase in engine performance is achieved through different engine block software and two turbine options.
The increase in displacement and the high ignition pressure required due to the increase in power, combined with the limited space in the engine compartment, did not allow the cylinder block to be made of aluminum. Therefore, the cylinder block of the OM640 engine is made of cast iron and does not have separate cast iron liners. The disadvantage of this is an increase in weight by 18 kg, but on the other hand, the engine noise level is reduced. The cylinder head is made of high-strength alloy aluminum and is equipped with 2 camshafts and 4 valves per cylinder. The valves are controlled by roller tappets with hydraulic compensators.
Specifications
| Manufacturer | Mercedes Benz |
| Also called | OM 640 |
| Start of production | 2003 |
| Cylinder block alloy | cast iron |
| Fuel system | direct injection |
| Configuration | inline |
| Number of cylinders | 4 |
| Piston stroke, mm | 92 |
| Cylinder bore, mm | 83 |
| Compression ratio | 18:1 |
| Displacement, cc | 1991 |
| Power output, hp | 82-109/2600 |
| Torque output, Nm / rpm | 180-260/2600 |
| Fuel type | diesel |
| Euro standards | Euro 4 |
| Firing order | 1-3-4-2 |
Interestingly, the OM640 is the base for the Thielert Centurion 2.0 aircraft engine. Also used as a base for the Austro Engine AE-300/330 aircraft engine in the Diamond DA-42 and DA-62 aircraft.
Explanation of OM 640 marking
| OM | Heavy Fuel Oil (Diesel) ICE |
| 640 | Engine type: 4-cylinder in-line. |
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