Mercedes-Benz OM 639 / OM 640 diesel engine
2004 to 2012
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.
|Engine||designation||capacity||Bore · stroke||Compression
|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|
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|