The Mercedes-BenzOM629 is a 4.0 litres (3,996 cc) diesel-fuelled,4-stroke,compression-ignitioninternal combustion 75° 32-valveV8 engine used in the 2000s.
| Mercedes-Benz OM629 | |
|---|---|
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| Overview | |
| Manufacturer | Mercedes-Benz |
| Production | 2005–2013 |
| Layout | |
| Configuration | 75°V8 |
| Displacement | 4.0 L (3,996 cc) |
| Cylinder bore | 86 mm (3.39 in) |
| Piston stroke | 86 mm (3.39 in) |
| Cylinder block material | Aluminium alloy |
| Valvetrain | DOHC4 valves x cyl. |
| Compression ratio | 17.0:1 |
| Combustion | |
| Turbocharger | Variable-geometry |
| Fuel system | Common rail |
| Fuel type | Diesel |
| Cooling system | Water cooled |
| Output | |
| Power output | 225–235 kW (306–320 PS; 302–315 hp) |
| Torque output | 700–730 N⋅m (516–538 lb⋅ft) |
| Chronology | |
| Predecessor | Mercedes-Benz OM628 |
| Successor | Mercedes-Benz OM656 |
Design
editThe block features an aluminiumcrankcase andcylinder heads. It uses aluminiumsand casting in bedplate construction (divided at the height of thecrankshaft) with wetcylinder liners made of cast iron.
The main bearings are reinforced, cast inGGG ductile cast iron. Rather than the usual 90° "vee" angle between the cylinder banks, a 75° angle was chosen due to the space available to install the engine.[1] The consequence of this specific angle is free inertial forces of the first order. To compensate for this, the OM628 and OM629 use abalancer shaft located in the vee of the engine. To ensure even firing intervals the crankshaft uses splitcrank pins. The engine uses 97.0 mm cylinder spacing.
The engine usesdual overhead camshafts on each bank (‘quad-cam’) withfour valves per cylinder, operated by hydraulictappets. Each cylinder bank uses avariable geometry turbocharger. The compressed air from these is cooled by an air to water heat exchanger with an additional cold water circuit.
Compared to the OM628, the OM629 engine has an improvedcommon-rail system,[2] and higher boost from the turbochargers. It displaces 4.0 L (3,996 cc) and produces between 225 to 235 kW (306 to 320 PS; 302 to 315 hp) at 3600 rpm, and 700 to 730 N⋅m (516 to 538 lb⋅ft) of torque between 2000–2600 rpm.
Models
edit| Engine | Power | @ rpm | Torque | @ rpm | Years |
|---|---|---|---|---|---|
| OM629 | 225 kW (306 PS; 302 hp) | 3,600 | 700 N⋅m (516 lb⋅ft) | 2,000–2,600 | 2006–2010 |
| 231 kW (314 PS; 310 hp) | 730 N⋅m (538 lb⋅ft) | 2,200 | 2005–2009 | ||
| 235 kW (320 PS; 315 hp) | 2006–2010 |
OM629 (225 kW version)
edit- 2006–2009X164 GL420 CDI
- 2007–2009W164 ML420 CDI
- 2009–2010X164 GL450 CDI
- 2009–2010W164 ML450 CDI
OM629 (231 kW version)
edit- 2005–2009W211 E420 CDI
OM629 (235 kW version)
edit- 2006–2009W221 S420 CDI
- 2009–2010W221 S450 CDI
References
edit- ^"Mercedes-Benz OM628 and OM629 engines (2000-2010)".AustralianCar.Reviews. Retrieved2018-03-28.
- ^Chick, David (22 June 2017)."Diesels Around The World: Mercedes-Benz".Diesel Army. Retrieved2018-03-28.