Mercedes-Benz OM602 engine
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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, it's considered to be the one of the most reliable engines ever produced, a success which is only comparable with the famous OM617 engine.
The 5-cylinder OM602 was succeeded by the four valve engine OM605 (E250D 20V) and later the OM612 and OM647 with turbo charger and Common Rail Direct Injection (C/E/ML 270CDI).
[edit] The engine
The Mercedes OM602 engine is a 5 cylinder diesel engine of 2497cc. The engine was also increased in capacity to 2874cc (2.9L) and used in the Phase 1 Mercedes Sprinter vans, 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 earlier models of 2497cc 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.
The later, 2.9L capacity unit uses a Bosch VE style rotary distributor injection pump with electronic control. This larger capacity version uses direct injection.
Preheating is by glow plugs with automatic control of preheating time.
[edit] Versions of OM602 Mercedes 5-cylinder diesel engine
| Model indication | Year | Engine no OM602... | Power in kW (HP) |
| OM 602.xxx (5-cylinder diesel) | |||
| W201 190 2.5 D. & 250 D | 04/1985 - 06/1993 | .911 & .912 & .930 & .931 | 66 (90) (<'89) or 69 (94) (>'89) |
| G-Class 250 GD 4x4 | .938 & .939 | ||
| 210 & 310 & 410 2,9 D. | 10/1988 -> ? | .940 & .942 | 72 (98) or 75 (102) |
| G-Class 290 GD 4x4 | .946 & .947 | ||
| W201 190 2.5 turbodiesel & W124 250D Turbo | 01/1987 -> 1993 | A.961 & A.962 | 90 (122) (<'88) or 92 (126) (>'88) |
| Sprinter 2,5 Turbo-D. | A.963 | ||
| 212D & 312D & 412D & Sprinter 2,9 TD. | 02/1995 -> 04/2000 | A.980 & A.986 | 90 (122) |
| G-Class 290 GD turbodiesel 4x4 | 07/1997 -> 09/2000 | A.983 | 88 (120) |
| W210 E290 turbodiesel | 03/1996 -> 07/1999 | A.982 | 95 (129) |
