Mercedes-Benz OM629 engine
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Mercedes-Benz OM628/OM629
| OM628/OM629 | |
|---|---|
| Overview | |
| Manufacturer | Mercedes-Benz |
| Production | 1999-2010 |
| Layout | |
| Displacement | 3,996 cc (4.0 L; 243.9 cu in) |
| Cylinder bore | 86.0 mm |
| Piston stroke | 86.0 mm |
| Valvetrain | DOHC |
| Compression ratio | 17.0:1 - 18.5:1 |
| Combustion | |
| Turbocharger | 2 |
| Chronology | |
| Predecessor | - |
| Successor | OM656 |
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
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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
References
- ^ "Audi A8 3.3 TDI, BMW 740d, Mercedes S 400 CDI (German)". Auto Motor und Sport. Retrieved 28 March 2018.
- ^ "Mercedes-Benz OM628 and OM629 engines (2000-2010)". AustralianCar.Reviews. Retrieved 28 March 2018.
- ^ "OM 628 DE 40 LA". JESMB. Retrieved 28 March 2018.
- ^ "BMW 740d (E65) vs Mercedes S400 CDI (W220): luxury diesels (Russian)". Mitchell Auto. Retrieved 28 March 2018.
- ^ Chick, David. "Diesels Around The World: Mercedes-Benz". Diesel Army. Retrieved 28 March 2018.
External links
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