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| Mercedes-Benz OM617 engine | |
|---|---|
 | |
| Overview | |
| Manufacturer | Daimler-Benz |
| Production | 1974–1991 |
| Layout | |
| Configuration | Straight-5 |
| Displacement | 3.0 L (2,998 cc) 3.0 L (3,005 cc) |
| Cylinder bore | 90.9 mm (3.58 in) 91 mm (3.58 in) |
| Piston stroke | 92.4 mm (3.64 in) |
| Cylinder block material | Cast iron |
| Cylinder head material | Cast iron |
| Valvetrain | Chain driven SOHC 10-valve |
| Compression ratio | 21.0:1 |
| Combustion | |
| Operating principle | Diesel |
| Turbocharger | Only on OM 617.950 |
| Fuel system | Indirect injection |
| Management | Bosch M or MW pump |
| Oil system | Wet sump |
| Cooling system | Water-cooled |
| Output | |
| Power output | 80–230 PS (59–169 kW; 79–227 hp) |
| Torque output | 168–250 N⋅m (124–184 lb⋅ft) |
| Chronology | |
| Successor | OM602 |
The OM617 engine family is a straight-5 diesel automobile engine from Mercedes-Benz used in the 1970s and 1980s. It is a direct development from the straight-4 OM616. It was sold in vehicles from 1974 to 1991. The OM617 is considered to be one of the most reliable engines ever produced with engines often reaching over 1,000,000 km (620,000 mi) without being rebuilt and is one of the key reasons for Mercedes' popularity in North America in the 1980s, as it was powerful and reliable compared to other automotive diesels of the time. It is also a very popular choice for the use of alternative fuels, mainly straight or waste vegetable oil and biodiesel, although the use of these fuels may cause engine damage over time if not processed properly before use.