Info
Mercedes-Benz OM 639 / OM 640 diesel engine
2004 to 2012
Technology
The OM 640 has one common-rail injection and four valves per cylinder. All variants are equipped with engine charging and intercooling. As usual with Mercedes, the overhead camshafts are driven by two timing chains .
The motor is inclined forwards by approx. 60 ° and is installed transversely behind the driven front axle on vehicles with sandwich floor . Power is transmitted via a manual gearbox with five (160 CDI) or six gears (180 CDI and 200 CDI) or via the continuously variable Autotronic . The engine and transmission could only be used in these vehicles due to their unusual installation position.
OM 640
| Engine | designation | capacity | Bore · stroke | Compression ratio | power | torque | model |
| OM 640 DE 20 LA red. | 640942 | 1991 cm³ | 83 x 92 mm | 18: 1 | 60 kW (82 hp) at 4200 rpm | 180 Nm at 1400-2600 / min | A 160 CDI |
| OM 640 DE 20 LA red. | 640940 | 1991 cm³ | 83 x 92 mm | 18: 1 | 80 kW (109 hp) at 4200 rpm | 250 Nm at 1600-2600 / min | A 180 CDI, B 180 CDI |
| OM 640 DE 20 LA | 640941 | 1991 cm³ | 83 x 92 mm | 18: 1 | 103 kW (140 hp) at 4200 rpm | 300 Nm at 1600-3000 / min | A 200 CDI, B 200 CDI |
OM 639
On the basis of the OM 640, a version capped by a cylinder was used in the 2004 Smart Forfour and Mitsubishi Colt . Also, the OM 639 has timing chains and a common-rail injection, with the exception of the missing fourth cylinder, data such as bore and stroke are identical. However, the installation position is typical for front-wheel drive: engine standing transversely in front of the front axle. It was offered in two performance levels:
| Engine | capacity | Hole · Hub | compression ratio | power | torque | model |
| OM 639 DE 15 LA red. | 1493 cm³ | 83 x 92 mm | 18: 1 | 50 kW (68 hp) at 4000 rpm | 160 Nm at 1600 rpm | forfour cdi |
| OM 639 DE 15 LA | 1493 cm³ | 83 x 92 mm | 18: 1 | 70 kW (95 hp) at 4000 rpm | 210 Nm at 1800 rpm | forfour 1.5 cdi |
Technical
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Mercedes OM 639 640 engine Technical details and specifications (2004-2012)
Mercedes-Benz 2.0D Engine code: OM 640
No. of cylinders 4/DOHC
Capacity 1991 cc
Compression ratio 18.0:1
Injection sequence 1-3-4-2
Injection Nozzle opening pressure -1600 bar
Glow plug activation time 3 secs
Oil pressure 3.0 bar @ 2000 rpm© Motor car History
Service
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Mercedes OM 639 640 engine Service Guide (2004-2012)
Mercedes-Benz 2.0D Engine code: OM 640
Valve clearance - INLET Hydraulic
Valve clearance - EXHAUST Hydraulic
Engine oil grade - moderate climate 5W/30 SAE Synthetic or 5W/40 SAE Synthetic
Engine oil grade - cold climate 0W/30 SAE Synthetic
Engine oil grade - hot climate 5W/30 SAE Synthetic
Engine oil change 5.8 litres
Engine oil Sump drain bolt Tighten 30 Nm
Manual gearbox oil 75W-80W SAE 1.8 litres
Automatic transmission fluid ATF 28-CVT 4.0 litres
Cooling system 9.4-9.8 litres
Brake fluid Type DOT 4+ 0.5 litres© Motor car History
Maintenance
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