Mercedes-Benz OM602 engine
The successor of the OM617 engine family was the newly developed straight-5 diesel automobile engine OM602 from Mercedes-Benz used from 1980s up to 2002. With some Mercedes-Benz 250D/E250D diesels exceeding 500,000 or 1,000,000 miles (800,000 or 1,610,000 km), it is considered to be one of the most reliable engines ever produced, a success which is only comparable with the famous OM617 engine.
| Mercedes-Benz OM602 Diesel Engine | |
|---|---|
 | |
| Overview | |
| Manufacturer | Daimler-Benz |
| Production | 1985 to 2002 |
| Layout | |
| Configuration | Straight-5 |
| Displacement | 2.5 L (2,497 cc) 2.9 L (2,874 cc) |
| Valvetrain | SOHC 10 valves |
| Combustion | |
| Turbocharger | On some versions |
| Fuel system | Indirect injection Direct injection |
| Management | Bosch PES in-line or VE-style rotary distributor injection pumps |
| Fuel type | Diesel |
| Cooling system | Water-cooled |
| Output | |
| Power output | 66–95 kW (90–129 PS; 89–127 hp) |
| Chronology | |
| Successor | OM605 |
The 5-cylinder OM602 was succeeded by the four-valve engine OM605 (E250D 20V) and later the OM612 and OM647 with turbocharger and common rail direct injection (C/E/ML 270CDI).
The engine
The Mercedes OM602 engine is a 5-cylinder diesel engine of 2.5 or 2.9 L (2,497 or 2,874 cc). The 2.9 L (2,874 cc) was used in the 310D and 410D Mercedes-Benz T1 and the Phase 1 Mercedes-Benz Sprinter vans (where it was modified for direct injection), the Ssangyong Musso and Korando range and even in the 1996–1999 models of the E-class. It was available in either naturally aspirated or turbocharged variants with two valves per cylinder.
The camshafts and injection pump are driven by duplex chain from the crankshaft. A separate single-row chain drives the oil pump. The camshaft operated the valves via hydraulic bucket tappets; valve clearance adjustment is automatic.
On many OM602 engines fuel injection is indirect. A Bosch PES in-line injection pump is used, with a mechanical governor and vacuum-operated stop control. The pump is lubricated by a connection to the engine oil circulation and the fuel lift pump is mounted on the side of the injection pump.
Some later versions of the 2.9 L (2,874 cc) capacity unit use a Bosch VE-style rotary distributor injection pump with electronic control and have a significantly different combustion chamber as they use direct injection.
Preheating is by glow plugs with automatic control of preheating time.
Versions of OM602 Mercedes 5-cylinder diesel engine
| Model indication | Year | Engine no OM602... | Power |
| OM 602.xxx (5-cylinder diesel) | |||
| W201 190 2.5 D & W124 250 D | 04/1985 - 06/1993 | .911 & .912 & .930 & .931 | 66 kW (90 PS; 89 hp) (<'89) or 69 kW (94 PS; 93 hp) (>'89) |
| G-Class 250 GD 4x4 | .938 & .939 | ||
| T1 210 & 310 & 410 2.9 D. | 10/1988 -> 1995 | .940 & .942 | 72 kW (98 PS; 97 hp) or 75 kW (102 PS; 101 hp) |
| G-Class 290 GD 4x4 | .946 & .947 | ||
| W201 190D 2.5 Turbo & W124 250D Turbo / 300D 2.5 Turbo | 01/1987 -> 1996 | A.961 & A.962 | 90 kW (122 PS; 121 hp) (<'88) or 92 kW (125 PS; 123 hp) (>'88) |
| Sprinter 2,5 Turbo-D. | A.963 | ||
| 212D & 312D & 412D & Sprinter 2.9 TD | 02/1995 -> 04/2000 | A.980 & A.986 | 90 kW (122 PS; 121 hp) |
| G-Class 290 GD turbodiesel 4x4 | 07/1997 -> 09/2000 | A.983 | 88 kW (120 PS; 118 hp) |
| W210 E290 turbodiesel | 03/1996 -> 07/1999 | A.982 | 95 kW (129 PS; 127 hp) |
| Ssangyong Musso | 1993 -> 2005 | 662.910 | 95 kW (129 PS; 127 hp) |