Mercedes OM642 engine
Content
- Specifications of the Mercedes OM642 3.0 CDI engine
- Description of the motor device OM 642 3.0 diesel
- Fuel consumption ICE OM 642
- Which models are equipped with the Mercedes OM642 power unit
- Reviews on the OM 642 engine, its pros and cons
- Mercedes OM 642 3.0 CDI internal combustion engine maintenance schedule
- Disadvantages, breakdowns and problems of the OM 642 engine
- The price of the Mercedes OM642 engine new and used
The 3.0-liter V6 diesel engine Mercedes OM 642 has been produced by the concern since 2005 and is installed on almost all models from the C-Class to the G-Class SUV and Vito minibuses. Also, this diesel engine is actively installed on Chrysler and Jeep models under its EXL index.
Specifications of the Mercedes OM642 3.0 CDI engine
| A type | V-shaped |
| Number of cylinders | 6 |
| Number of valves | 24 |
| Exact volume | 2987 cm³ |
| Bore | 83 mm |
| Piston stroke | 92 mm |
| Supply system | Common Rail |
| Power | 184 - 204 HP |
| Torque | 400 - 500 Nm |
| Compression ratio | 18.0 |
| fuel type | diesel |
| Ecologist. norm | 4/5/6 |
| A type | V-shaped |
| Number of cylinders | 6 |
| Number of valves | 24 |
| Exact volume | 2987 cm³ |
| Bore | 83 mm |
| Piston stroke | 92 mm |
| Supply system | Common Rail |
| Power | 211 - 235 HP |
| Torque | 440 - 540 Nm |
| Compression ratio | 18.0 |
| fuel type | diesel |
| Ecologist. norm | 4/5 |
| A type | V-shaped |
| Number of cylinders | 6 |
| Number of valves | 24 |
| Exact volume | 2987 cm³ |
| Bore | 83 mm |
| Piston stroke | 92 mm |
| Supply system | Common Rail |
| Power | 231 - 265 HP |
| Torque | 540 - 620 Nm |
| Compression ratio | 18.0 |
| fuel type | diesel |
| Ecologist. norm | 5/6 |
The weight of the OM642 engine according to the catalog is 208 kg
Description of the motor device OM 642 3.0 diesel
In 2005, the German concern Daimler AG introduced its first V6 diesel unit. By design, there is an aluminum block with a 72° camber angle and cast-iron liners, a pair of aluminum DOHC heads with hydraulic lifters, a double-row timing chain drive, a Bosch CP3 common rail fuel system with piezo injectors and an injection pressure of 1600 bar, as well as a Garrett GTB2056VK electric turbine variable geometry and intercooler.
Engine number OM642 is located in front, at the junction of the block with the head
During the production process, the diesel engine was repeatedly upgraded and, when updated in 2014, received an AdBlue urea injection system, as well as a Nanoslide coating instead of cast iron liners.
Fuel consumption ICE OM 642
On the example of a 320 Mercedes ML 2010 CDI with automatic transmission:
| City | 12.7 liters |
| Track | 7.5 liters |
| Mixed | 9.4 liters |
Which models are equipped with the Mercedes OM642 power unit
| C-Class W203 | 2005 – 2007 |
| C-Class W204 | 2007 – 2014 |
| CLS-Class W219 | 2005 – 2010 |
| CLS-Class W218 | 2010 – 2018 |
| CLK-Class C209 | 2005 – 2010 |
| E-Class C207 | 2009 – 2017 |
| E Class W211 | 2007 – 2009 |
| E Class W212 | 2009 – 2016 |
| E Class W213 | 2016 – 2018 |
| R-Class W251 | 2006 – 2017 |
| ML-Class W164 | 2007 – 2011 |
| ML-Class W166 | 2011 – 2015 |
| GLE-Class W166 | 2015 – 2018 |
| G-Class W463 | 2006 – 2018 |
| GLK Class X204 | 2008 – 2015 |
| GLC-Class X253 | 2015 – 2018 |
| GL-Class X164 | 2006 – 2012 |
| GLS-Class X166 | 2012 – 2019 |
| S-Class W221 | 2006 – 2013 |
| S-Class W222 | 2013 – 2017 |
| Sprinter W906 | 2006 – 2018 |
| Sprinter W907 | 2018 - p.t. |
| X-Class X470 | 2018 – 2020 |
| V-Class W639 | 2006 – 2014 |
| 300C 1 (LX) | 2005 – 2010 |
| Commander 1 (XK) | 2006 – 2010 |
| Grand Cherokee 3 (World Cup) | 2005 – 2010 |
Reviews on the OM 642 engine, its pros and cons
Advantages:
- With normal care, a high resource
- Gives the car excellent dynamics
- Very reliable double row timing chain
- The head has hydraulic lifters.
Disadvantages:
- Intake swirl flaps sticking
- Grease leaks happen quite often.
- Short-lived VKG valve diaphragm
- And non-repairable piezo injectors
Mercedes OM 642 3.0 CDI internal combustion engine maintenance schedule
| Periodicity | every 10 km |
| The volume of lubricant in the internal combustion engine | 8.8/ 10.8/ 12.8 liters * |
| Needed for replacement | 8.0/ 10.0/ 12.0 liters * |
| What kind of oil | 5W-30, MB 228.51/229.51 |
| Timing drive type | chain |
| Declared resource | is not limited |
| On practice | 400 000 km |
| On break/jump | valve bends |
| Adjustment | not required |
| Adjustment principle | hydraulic compensators |
| The oil filter | 10 thousand km |
| Air filter | 10 thousand km |
| Fuel filter | 30 thousand km |
| Glow plugs | 90 thousand km |
| Auxiliary belt | 90 thousand km |
| Cooling liquid | 5 years or 90 thousand km |
Disadvantages, breakdowns and problems of the OM 642 engine
The most famous problem of this diesel engine is leaking on the heat exchanger gaskets, and since it is in the collapse of the block, replacing penny gaskets is not cheap. Around 2010, the design was finalized and such leaks no longer occur.
The power unit is equipped with a reliable Bosch Common Rail fuel system, but its piezo injectors are very demanding on fuel quality and are also expensive. It is also worth noting the regular failures of the fuel quantity control valve in the injection pump.
There are steel swirl flaps in the intake manifold of this power unit, but they are controlled by a servo with plastic rods that often break. The problem is greatly aggravated due to intake contamination due to the fault of a weak VCG membrane.
The Garrett turbine itself is very durable and runs quietly up to 300 km, except that the system for changing its geometry often wedges due to heavy pollution. Most often, the turbine is spoiled by crumbs from the destruction of the exhaust manifold welds.
This motor is famous for frequent lubricant leaks and not the most durable oil pump, and since it is sensitive to oil pressure, liners are not uncommon here.
The manufacturer claims the resource of the OM 642 engine is 200 km, but it runs up to 000 km.
The price of the Mercedes OM642 engine new and used
| The minimum cost | 160 000 rubles |
| Average price on the secondary | 320 000 rubles |
| Maximum cost | 640 000 rubles |
| Contract engine abroad | 4 500 euro |
| Buy such a new unit | — |
| Condition: | BOO |
| Box & Papers: | complete engine |
| Working volume: | 3.0 liters |
| Power: | 211 hp |
* We do not sell engines, the price is for reference
