Mercedes-Benz OM642
| Mercedes-Benz OM642 | |
|---|---|
| Overview | |
| Manufacturer | Daimler AG |
| Production | 2005- |
| Combustion chamber | |
| Displacement | 2,987 cc (182.3 cu in) |
| Cylinder bore | 83 mm (3.3 in) |
| Piston stroke | 92 mm (3.6 in) |
| Cylinder block alloy | Aluminium/Aluminium |
| Cylinder head alloy | Aluminium/Aluminium |
| Valvetrain | DOHC 6 cylinder |
| Compression ratio | 18:1 |
| Combustion | |
| Turbocharger | variable nozzle |
| Fuel system | Common rail injection |
| Fuel type | Diesel |
| Output | |
| Power output |
european models: 195 kW (265 PS; 261 hp). US vehicles: 157 kW (213 PS; 211 hp). Mercedes/Dodge Sprinter: 140 kW (190 PS; 190 hp). |
| Torque output |
european models: 620 N·m (460 lb·ft). , US vehicles: 540 N·m (400 lb·ft). Mercedes/Dodge Sprinter: 440 N·m (320 lb·ft). |
| Dimensions | |
| Dry weight | 208 kg (459 lb) |
european models: 195 kW (265 PS; 261 hp). US vehicles: 157 kW (213 PS; 211 hp).
european models: 620 N·m (460 lb·ft). , US vehicles: 540 N·m (400 lb·ft).
The Mercedes-Benz OM642 engine is a 3.0-liter, 72° 24-valve, aluminium/aluminium block and heads diesel V6 engine manufactured by the Mercedes-Benz division of Daimler AG as a replacement for the Mercedes-Benz inline straight 5 and straight 6 cylinder engines.
The engine features common rail fuel injection and a variable nozzle turbocharger. The injection system operates at 1,600 bar (23,000 psi), while the compression ratio is 18:1. The engine features a counter-rotating balance shaft mounted between the cylinder banks to cancel the vibrations inherent to the 72 degree V6 design, and the crankpins are offset by 48 degrees to achieve even 120 degree firing intervals. In some heavy vehicle applications, Mercedes' BlueTec AdBlue urea injection is utilised for NOx reduction. In lighter vehicle applications, a NOx storage catalyst captures nitrous oxides, which are periodically purged (decomposed) by running the engine slightly rich. A particulate filter lowers soot, making this engine ULEV certified. Engine mass is 208 kg (459 lb). Power output is 165 kW (224 PS; 221 hp) and 510 N·m (380 lb·ft) of torque. For the 2007 model year, torque is raised to 540 Nm.
Vehicles using this engine include:
The engine is manufactured at the Daimler AG plant in Marienfelde, Berlin, Germany.
Due to the inordinate number of pre-2010 OM642 engines needing repair due to heat-related seal degradation causing oil cooler leaks, Mercedes reformulated the seals from an orange color rubber to a purple color Viton seal now used in all 2010 and later engines. There is a Mercedes Technical Service Bulletin that states that the leak can be attributed to an improperly installed seal. This engine also has an inherent design flaw with the TWC temperature sensor (part no. A005 153 40 28) and the part in the electronic parts catalog is now specifying part no. A007 153 74 28; there is no recall on this service item yet. A check engine light may present with the OBD-2 diagnostic code P2031 upon failure of this sensor.
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