Mercedes-Benz OM602 engine
Mercedes-Benz OM602 Diesel Engine | |
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Overview | |
Manufacturer | Daimler-Benz |
Production | 1985 to 2002 |
Chronology | |
Successor | OM612 |
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 is considered to be 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 turbocharger and common rail direct injection (C/E/ML 270CDI).
The engine
The Mercedes OM602 engine is a 5-cylinder diesel engine of 2497cc or 2874cc. The 2874 cc (2.9 L) was used in the 310D and 410D Mercedes-Benz T1 and the Phase 1 Mercedes 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 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 in kW (hp) |
OM 602.xxx (5-cylinder diesel) | |||
W201 190 2.5 D & W124 250 D | 04/1985 - 06/1993 | .911 & .912 & .930 & .931 | 66 (90) (<'89) or 69 (94) (>'89) |
G-Class 250 GD 4x4 | .938 & .939 | ||
T1 210 & 310 & 410 2.9 D. | 10/1988 -> 1995 | .940 & .942 | 72 (98) or 75 (102) |
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 (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) |