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The Mercedes-Benz '''OM628''' and '''OM629''' were 4.0-litre diesel-fuelled, 4-stroke, compression-ignition internal combustion 90-degree 32-valve V8 engines used in the 2000s. The world’s first aluminium V8 diesel engine<ref>{{cite web|title=Audi A8 3.3 TDI, BMW 740d, Mercedes S 400 CDI (German)|url=https://www.auto-motor-und-sport.de/test/audi-a8-3-3-tdi-bmw-740d-mercedes-s-400-cdi/|website=Auto Motor und Sport|accessdate=28 March 2018}}</ref> for passenger car use, the engine was replaced by the OM656 straight-6 engine.
The '''OM628''' and '''OM629''' are 4.0-litre V8 turbodiesel engines manufactured by the German car manufacturer [[Mercedes-Benz]] between 1999-2010. The engine used an unusual 75° vee angle between the cylinder banks. It is a [[common rail]] [[turbodiesel]] V8 design, using [[DOHC|double overhead camshafts]] and 32 valves. Over its lifetime the engine produced power outputs ranging from {{convert|250|PS|kW|abbr=on}} to {{convert|320|PS|kW|abbr=on}}.

==Design==
⚫
The block features an aluminium crankcase and cylinder heads. It uses aluminium sand casting in bedplate construction (divided at the height of the crankshaft) with wet cylinder liners made of cast iron.

The main bearings are reinforced, cast in GGG ductile cast iron. Rather than the usual 90° vee angle between the cylinder banks, a 75° angle was chosen<ref>{{cite web|title=Mercedes-Benz OM628 and OM629 engines (2000-2010)|url=http://australiancar.reviews/mercedesbenz_OM628_OM629.php|website=AustralianCar.Reviews|accessdate=28 March 2018}}</ref> due to the space available to install the engine. The consequence of this specific angle is free inertial forces of the first order. To compensate for this, the OM628 and OM629 use a balancer shaft located in the vee of the engine. To ensure even firing intervals the crankshaft uses split crank pins.The engine uses 97.0 mm cylinder spacing.

The engine uses double overhead camshafts (DOHC) on each bank (‘quad-cam’) with four valves per cylinder, operated by hydraulic tappets. Each cylinder bank uses a variable geometry turbocharger. The compressed air from these is cooled by an air to water heat exchanger with an additional cold water circuit.

==OM628==
==OM628==
⚫
[[File:Mercedes-Benz_E_400_CDI_Elegance_%28W_211%29_–_Heckansicht%2C_16._Juni_2013%2C_Münster.jpg|thumb|right|400px|alt=Mercedes-Benz W211 E400 CDI silver|The 2003-2005 W211 E400 CDI used the OM628]]
⚫
The OM628, introduced in 1999, featured an aluminium crankcase and cylinder heads. It used aluminum sand casting in bedplate construction (divided at the height of the crankshaft) with inserted wet cylinder liners made of cast iron ( centrifugal casting ). Reinforcements of the main bearings made of GGG are cast in the lower part.
Introduced in 1999, The OM628’s capacity is 4.0L (3996cc). It uses a ‘square’ bore and stroke of 86 mm. Output varies from 250 PS to 260 PS at 4000 rpm with 560 Nm of torque at 1700-2600 rpm<ref>{{cite web|title=OM 628 DE 40 LA|url=http://www.jesmb.de/engine.htm|website=JESMB|accessdate=28 March 2018}}</ref> depending on application<ref>{{cite web|title=BMW 740d (E65) vs Mercedes S400 CDI (W220): luxury diesels (Russian)|url=http://www.mitchell-auto.ru/auto/cars/e65-w220cc.html|website=Mitchell Auto|accessdate=28 March 2018}}</ref>.
The bore is 86 mm, the stroke 86 mm. The compression ratio is 18.5: 1. The cylinder spacing is 97 mm. For the angle between the cylinder banks 75° and not 90° were chosen due to the installation space as usual in V8 engines. As a result, free inertial forces of the first order occur. To compensate for this, over the crankshaft a balancing shaft is placed in the cylinder V. For even firing intervals, the crank pins are the crankshaft divided (without intermediate web). For each cylinder bank, the engine has a turbocharger with adjustable turbine vanes, two overhead camshafts, and four valves per cylinder operated by hydraulic bucket tappets.
⚫
[[File:Mercedes-Benz_E_400_CDI_Elegance_%28W_211%29_–_Heckansicht%2C_16._Juni_2013%2C_Münster.jpg|thumb|left|400px|alt=Mercedes-Benz W211 E400 CDI silver]]


The engine was used until 2005 when it was replaced by the updated OM629.
The charge air is cooled by an air-water heat exchanger with a second, cold water circuit. This has the advantage that the cooler contains a smaller volume of air, while still lower flow resistance.


'''Applications'''
The engine was used until 2005 in the [[Mercedes-Benz_E-Class_(W211)#2002%E2%80%932006|W211]] E400 CDI, [[Mercedes-Benz_S-Class_(W220)|W220]] S400 CDI, [[Mercedes-Benz_G-Class#G-Class_463_(1990%E2%80%932018)|G]]400 CDI and [[Mercedes-Benz_M-Class#First_generation_(W163;_1997%E2%80%932005)|W163]] ML400 CDI, when it was replaced by the updated OM629.
* [[Mercedes-Benz_M-Class#First_generation_(W163;_1997%E2%80%932005)|W163]] ML400 CDI
* [[Mercedes-Benz_E-Class_(W211)#2002%E2%80%932006|W211]] E400 CDI
* [[Mercedes-Benz_S-Class_(W220)|W220]] S400 CDI
* [[Mercedes-Benz_G-Class#G-Class_463_(1990%E2%80%932018)|W463]] G400 CDI


==OM629==
==OM629==
The OM629 is an updated version of the OM628 with an improved common-rail system<ref>{{cite web|last1=Chick|first1=David|title=Diesels Around The World: Mercedes-Benz|url=http://www.dieselarmy.com/engine-tech/engine/diesels-around-the-world-mercedes-benz/|website=Diesel Army|accessdate=28 March 2018}}</ref> and higher boost from the turbochargers. Still displacing 4.0L (3996cc) the engine produced between 306 PS to 320 PS at 3600 rpm and 700 Nm to 730 Nm or torque between 2000-2600 rpm.
With newer CDI technology and higher boost pressure of the two turbochargers, but same displacement, this engine achieves higher power and torque values. It was manufactured from mid-2005 in the [[Mercedes-Benz_E-Class_(W211)|W211]] E420 CDI and [[Mercedes-Benz_S-Class_(W221)|W221]] S420 CDI/S450 CDI saloons and [[Mercedes-Benz_M-Class#Second_generation_(W164;_2005%E2%80%932011)|W164]] ​​ML420 CDI and [[Mercedes-Benz_GL-Class#First_generation_(X164;_2006%E2%80%932012)|X164]] GL420 CDI. It was replaced by the OM656 straight-6 diesel engine.

'''Applications'''
* [[Mercedes-Benz_M-Class#Second_generation_(W164;_2005%E2%80%932011)|W164]] ​​ML420 CDI / ML450 CDI
* [[Mercedes-Benz_E-Class_(W211)|W211]] E420 CDI
* [[Mercedes-Benz_S-Class_(W221)|W221]] S420 CDI / S450 CDI
* [[Mercedes-Benz_GL-Class#First_generation_(X164;_2006%E2%80%932012)|X164]] GL420 CDI / GL450 CDI


== References ==
== References ==
http://www.jesmb.de/engine.htm<br/>
http://australiancar.reviews/mercedesbenz_OM628_OM629.php<br/>
http://www.mitchell-auto.ru/auto/cars/e65-w220cc.html
{{Reflist}}
{{Reflist}}


== External links ==
== External links ==
* [https://de.wikipedia.org/wiki/Mercedes-Benz_OM_628/OM_629|Mercedes-Benz OM628/OM629 on German Wikipedia]
* [https://de.wikipedia.org/wiki/Mercedes-Benz_OM_628/OM_629|Mercedes-Benz OM628/OM629 on German Wikipedia]
* [http://www.mitchell-auto.ru/auto/cars/e65-w220cc.html] W220 S400 CDI v E65 740d (Russian)


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Revision as of 21:22, 28 March 2018

Mercedes-Benz OM628/OM629

OM628/OM629
Overview
ManufacturerMercedes-Benz
Production1999-2010
Layout
Displacement3,996 cc (4.0 L; 243.9 cu in)
Cylinder bore86.0 mm
Piston stroke86.0 mm
ValvetrainDOHC
Compression ratio17.0:1 - 18.5:1
Combustion
Turbocharger2
Chronology
Predecessor-
SuccessorOM656

The Mercedes-Benz OM628 and OM629 were 4.0-litre diesel-fuelled, 4-stroke, compression-ignition internal combustion 90-degree 32-valve V8 engines used in the 2000s. The world’s first aluminium V8 diesel engine[1] for passenger car use, the engine was replaced by the OM656 straight-6 engine.

Design

The block features an aluminium crankcase and cylinder heads. It uses aluminium sand casting in bedplate construction (divided at the height of the crankshaft) with wet cylinder liners made of cast iron.

The main bearings are reinforced, cast in GGG ductile cast iron. Rather than the usual 90° vee angle between the cylinder banks, a 75° angle was chosen[2] due to the space available to install the engine. The consequence of this specific angle is free inertial forces of the first order. To compensate for this, the OM628 and OM629 use a balancer shaft located in the vee of the engine. To ensure even firing intervals the crankshaft uses split crank pins.The engine uses 97.0 mm cylinder spacing.

The engine uses double overhead camshafts (DOHC) on each bank (‘quad-cam’) with four valves per cylinder, operated by hydraulic tappets. Each cylinder bank uses a variable geometry turbocharger. The compressed air from these is cooled by an air to water heat exchanger with an additional cold water circuit.

OM628

Mercedes-Benz W211 E400 CDI silver
The 2003-2005 W211 E400 CDI used the OM628

Introduced in 1999, The OM628’s capacity is 4.0L (3996cc). It uses a ‘square’ bore and stroke of 86 mm. Output varies from 250 PS to 260 PS at 4000 rpm with 560 Nm of torque at 1700-2600 rpm[3] depending on application[4].

The engine was used until 2005 when it was replaced by the updated OM629.

Applications

OM629

The OM629 is an updated version of the OM628 with an improved common-rail system[5] and higher boost from the turbochargers. Still displacing 4.0L (3996cc) the engine produced between 306 PS to 320 PS at 3600 rpm and 700 Nm to 730 Nm or torque between 2000-2600 rpm.

Applications

  • W164 ​​ML420 CDI / ML450 CDI
  • W211 E420 CDI
  • W221 S420 CDI / S450 CDI
  • X164 GL420 CDI / GL450 CDI

References

  1. ^ "Audi A8 3.3 TDI, BMW 740d, Mercedes S 400 CDI (German)". Auto Motor und Sport. Retrieved 28 March 2018.
  2. ^ "Mercedes-Benz OM628 and OM629 engines (2000-2010)". AustralianCar.Reviews. Retrieved 28 March 2018.
  3. ^ "OM 628 DE 40 LA". JESMB. Retrieved 28 March 2018.
  4. ^ "BMW 740d (E65) vs Mercedes S400 CDI (W220): luxury diesels (Russian)". Mitchell Auto. Retrieved 28 March 2018.
  5. ^ Chick, David. "Diesels Around The World: Mercedes-Benz". Diesel Army. Retrieved 28 March 2018.

External links


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