Engine Mercedes OM602

A series of diesel engines Mercedes OM 602 for 2.5 and 2.9 liters was assembled from 1985 to 2001 and installed on many popular models of the concern, such as W124, W201, W210 or W463. In addition to the pre-chamber versions of the engine, a modification with direct fuel injection was offered.

The diesel R5-family includes: OM617, OM602, OM605, OM612, OM647.

Specifications

Production years	1985-2001
Displacement, cc	2497 (OM 602 D 25 or 250D, OM 602 D 25 A or 250TD) 2874 (OM 602 D 29 or 290D, OM 602 DE 29 LA or 290TD)
Fuel system	prechamber
Power output, hp	84 – 94 (D25) 122 – 126 (D25A) 95 – 98 (D29) 120 – 129 (DE29LA)
Torque output, Nm	154 – 158 (D25) 225 – 231 (D25A) 192 (D29) 280 – 300 (DE29LA)
Cylinder block	cast iron R5
Block head	aluminum 10v
Cylinder bore, mm	87 (D25, D25A) 89 (D29, DE29LA)
Piston stroke, mm	84 (D25, D25A) 92.4 (D29, DE29LA)
Compression ratio	22.0 (D25, D25A, D29) 19.5 (DE29LA)
Features	no (D25, D25A, D29) intercooler (DE29LA)
Hydraulic lifters	yes
Timing drive	chain
Phase regulator	no
Turbocharging	no (D25) yes (D25A) no (D29) yes (DE29LA)
Recommended engine oil	5W-40
Engine oil capacity, liter	7.0
Fuel type	diesel
Euro standards	EURO 1
Fuel consumption, L/100 km (for Mercedes 190D 1992) — city — highway — combined	8.6 5.5 7.1
Engine lifespan, km	~450 000
Weight, kg	205

The engine was installed on:

• Mercedes C-Class W201 in 1985 – 1993;
• Mercedes E-Class W124 in 1985 – 1996; E-Class W210 in 1996 – 1999;
• Mercedes G-Class W460 in 1987 – 1992; G-Class W461 in 1992 – 2001; G-Class W463 in 1990 – 1992;
• Mercedes TN/T1 VAN in 1989 – 1995;
• Mercedes T1N Sprinter W901 in 1997 – 2000.

Disadvantages of the OM602 engine

• Strong vibrations of this diesel engine adversely affect the life of its supports.
• The timing chain serves about 200 – 250 thousand km, and when it breaks, the block head cracks.
• When using cheap or old antifreeze, it often breaks through the cylinder head gasket.
• From low-quality oil, hydraulic lifters can knock on a run of 90,000 km.
• Also, a lot of problems for the owners are caused by the vacuum injection pump control system.

Modifications OM602

The most famous modifications:

• 912 is a power unit with a working volume of 2497 cubic meters. see It develops a power of 94 hp. There are 2 valves per cylinder.
• 911 – same displacement, but higher power – 90 hp There are 4 valves per cylinder.
• 962 – a version of the engine with a turbine, with the same displacement, but already developing 126 hp. 2 valves per cylinder.

Characteristics of other modifications:

602.911	2497 cc, Power 90 hp (66 kW) Australia, USA, Japan
602.911 602.912 602.930	2497 cc, Power 94 hp (69 kW)
602.931	2497 cc, Power 84 hp (62 kW)
602.938 602.939	2497 cc, Power 94 hp (69 kW) For Gelaendewagen, onboard network 24V.
602.940	2874 cc, Power 95 hp (70 kW)
602.941	2874 cc, Power 88 hp (65 kW)
602.942	2874 cc, Power 98 hp (72 kW)
602.946	2874 cc, Power 95 hp (70 kW)
602.947	2874 cc, Power 98 hp (72 kW) For Gelaendewagen, onboard network 24V.
602.948	2874 cc, Power 97 hp (71 kW) For Gelaendewagen, onboard network 24V. OM 602 D29
602.961	2497 cc, Power 122 hp (90 kW) turbocharged. OM 602 A. USA, Japan
602.961 602.962	2497 cc, Power 126 hp (93 kW) turbocharged. OM 602 A
602.962	2497 cc, Power 122 hp (90 kW) turbocharged. OM 602 A. USA, Japan
602.980	2874 cc, Power 122 hp (90 kW) turbocharged. OM 602 DE LA
602.981	2874 cc, Power 122 hp (90 kW) turbocharged. OM 602A DE 29 LA
602.982	2874 cc, Power 129 hp (95 kW) turbocharged. OM 602 DE LA
602.983 602.984 602.985 602.986	2874 cc, Power 122 hp (90 kW) turbocharged. OM 602A DE LA
602.990	63 kW (86 hp)
602.994	72 kW (98 hp)