TheMercedes-Benz OM642 engineis a 3.0 litres (2,987 cc),24-valve,aluminium/aluminium block and heads diesel 72°V6 enginemanufactured by theMercedes-Benzdivision ofDaimler AGas a replacement for the Mercedesstraight-5andstraight-6cylinder engines.[1]
| Mercedes-Benz OM642 engine | |
|---|---|
 | |
| Overview | |
| Manufacturer | Daimler AG |
| Production | 2005-Present |
| Layout | |
| Configuration | 72°V6 |
| Displacement | 3.0 L; 182.3 cu in (2,987 cc) |
| Cylinder bore | 83 mm (3.27 in) |
| Piston stroke | 92 mm (3.62 in) |
| Cylinder blockmaterial | Aluminium |
| Cylinder headmaterial | Aluminium |
| Valvetrain | DOHC4 valvesx cyl. |
| Compression ratio | 18.0:1 |
| Combustion | |
| Turbocharger | Variable nozzleGarrettGT2056VK, GTB2060VKLR, GTB2260VKLR |
| Fuelsystem | Common raildirect injection |
| Fuel type | Diesel |
| Cooling system | Water cooled |
| Output | |
| Power output | European models: 195 kW (265 PS; 261 hp). US vehicles: 157 kW (213 PS; 211 hp). Mercedes/Dodge Sprinter, x280 CDI models: 140 kW (190 PS; 188 hp). Mercedes-Benz G-Class (W461) G280/G300 CDI: 135 kW (184 PS; 181 hp). |
| Torque output | European models: 620 N⋅m (457 lb⋅ft). US vehicles: 540 N⋅m (398 lb⋅ft). Mercedes/Dodge Sprinter, x280 CDI models: 440 N⋅m (325 lb⋅ft). Mercedes-Benz G-Class (W461) G280/G300 CDI: 400 N⋅m (295 lb⋅ft). |
| Dimensions | |
| Dry weight | 208 kg (459 lb) |
| Chronology | |
| Predecessor | Mercedes-Benz OM648 engine |
| Successor | Mercedes-Benz OM656 engine VM A630(VM Motori) |
By 2010 a BlueTEC version of theMercedes SprinterOM642 was released. The BlueTEC systems allowed the elimination of much of theEGRin that vehicle's engine, which as a result gave 188 horsepower (140 kilowatts) compared to the non-BlueTec engine's 154 horsepower (115 kilowatts).[2]
The engine featurescommon railDirect injectionand avariable nozzle turbocharger.The injection system operates at 1,600 bar (23,000 psi), while the compression ratio is 18.0:1.[1]The engine features a counter-rotating balance shaft mounted between thecylinder banksto 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'BlueTecAdBlueureainjection is utilised forNOxreduction.[3]In lighter vehicle applications, a NOx storage catalyst capturesnitrous oxides,which are periodically purged (decomposed) by running the engine slightly rich. A particulate filter lowers soot, making this engineULEVcertified.[3][4]Engine mass is 208 kg (459 lb). Power output is 165 kW (224 PS; 221 hp) and 510 N⋅m (376 lb⋅ft) of torque.[1]For the 2007 model year, torque is raised to 540 N⋅m (398 lb⋅ft).
At the beginning of summer 2017 the engine, together withMercedes-Benz OM651was under investigation by the Federal Motor Transport Authority in respect of the alleged emissions cheating scandal wherein the laboratoryemissions testingproduced a different amount ofdiesel exhaust fluidusage and lower emissions than in real world operating scenarios.[5]
Implementation
editVehicles using this engine include:
- Dodge/Freightliner Trucks/Mercedes-Benz Sprinter(2006–2022)
- Jeep Grand CherokeeWK/WH (2005–2010 (Europe)1,2007–2008 (North America)2)
- Jeep Commander XK/XH(2006–2010 (Europe))
- Mercedes-Benz C320 CDI(2005–2007)
- Mercedes-BenzE280/E300/E320 CDI/BlueTEC(2007–2009)
- Mercedes-BenzC320/C350 CDI(2009–2014)
- Mercedes-BenzCLK320 CDI(2005–2010)
- Mercedes-BenzE350 CDI/BlueTEC(2010–2016)
- Mercedes-BenzE 350d(2016–2018)
- Mercedes-BenzGLK 350 CDI(2013–2015)
- Mercedes-BenzR280/R300/R320/R350 CDI/BlueTEC(2007–2012)
- Mercedes-BenzML280/ML300/ML320/ML350 CDI/BlueTEC(2007–2011)
- Mercedes-BenzML350 BlueTEC/GLE 350d(2011–2018)
- Mercedes-BenzG280 CDI Worker/G280 CDI Edition 30 PUR/G280/G300 CDI Professional(2007–2013)
- Mercedes-BenzG320 CDI/G350 CDI/BlueTEC(2007–2018)
- Mercedes-BenzGL320/350 CDI/BlueTEC(2006–2012)
- Mercedes-BenzGL350 BlueTEC/GLS 350d(2012–2018)
- Mercedes-BenzGLC 350d(2016–2019)
- Mercedes-BenzS320/350 CDI/BlueTEC(2005–2013)
- Mercedes-BenzS350 BlueTEC/S 350d(2013–2017)
- Mercedes-BenzCLS320/350 CDI(2005–2011)
- Mercedes-BenzVito 120/122 CDI/Viano 3.0 CDI(2006–2014)
- Chrysler 300C(2006–2011) (Europe, Australia and New Zealand only)
- Mercedes-BenzX350d(2017–2020)
Intake System
editAir is drawn into the engine through two air filters located above each cylinder head. The amount of the air is measured by two hot film mass air flow sensors B2/6&7. On Sprinter models, a single air filter housing is mounted upon brackets on top of the engine.
The variable geometry turbine is actuated via a linkage connecting the controller to vanes inside the turbine housing. With the VGT vanes in a closed position, the exhaust gases are accelerated into the turbine wheel blades increasing shaft speed thereby increasing boost. With the vanes in the open position the exhaust gases are decelerated causing a drop in the shaft speed and consequent drop in boost.
See also
editReferences
edit- ^abc"05_kompact_en.doc"(PDF).ourexcellentadventures. Archived fromthe original(PDF)on 2008-07-04.Retrieved2009-02-13.
- ^"Mercedes to bring Bluetec diesel to European-market Sprinters by 2012, but we get it first!".Apr 20, 2010.
- ^abConsumer Reports: What is BlueTec?Archived2009-06-06 at theWayback Machine
- ^"Motive Magazine ULEV certification, Diesel Car Bomb BlueTec".Archived fromthe originalon 2008-10-25.Retrieved2009-04-18.
- ^Abgas-Skandal: KBA findet angeblich deutliche Hinweise auf illegale Abschalteinrichtungen in Mercedes-Dieselautos,heise, 2017-07-14