A series of Mercedes OM604 diesel engines for 2.0 and 2.2 liters was assembled from 1993 to 1999 and installed on two models of the concern: C-Class in the back of the W202 or E-Class in the back of the W210. For taxi services, a modification of the 2.2-liter diesel engine derated to 75 hp was offered.
The diesel R4-family includes: OM616, OM601, OM604, OM611, OM640, OM646, OM651, OM654, OM668.
Specifications
| Production years | 1993-1999 |
| Displacement, cc | 1997 (OM 604 D 20) 2155 (OM 604 D 22) |
| Fuel system | prechamber |
| Power output, hp | 88 (OM 604 D 20) 95 (OM 604 D 22) |
| Torque output, Nm | 135 (OM 604 D 20) 150 (OM 604 D 22) |
| Cylinder block | cast iron R4 |
| Block head | aluminum 16v |
| Cylinder bore, mm | 87 (OM 604 D 20) 89 (OM 604 D 22) |
| Piston stroke, mm | 84 (OM 604 D 20) 86.6 (OM 604 D 22) |
| Compression ratio | 22.0 |
| Features | no |
| Hydraulic lifters | yes |
| Timing drive | chain |
| Phase regulator | no |
| Turbocharging | no |
| Recommended engine oil | 5W-40 |
| Engine oil capacity, liter | 6.5 |
| Fuel type | diesel |
| Euro standards | EURO 2/3 |
| Fuel consumption, L/100 km (for Mercedes C220 D 1996) — city — highway — combined |
9.7 6.1 7.4 |
| Engine lifespan, km | ~450 000 |
| Weight, kg | 180 |
The engine was installed on:
- Mercedes C-Class W202 in 1993 – 1999;
- Mercedes E-Class W210 in 1995 – 1998.
Disadvantages of the OM604 engine
- For iron, the motors are very reliable and have a resource of about 400 – 500 thousand km.
- The main problem with this diesel engine is the capricious Lucas fuel pump.
- Gaskets in high-pressure fuel pumps dry out over time, and not everyone will undertake its repair.
- The timing chain can already stretch for 200 – 250 thousand kilometers, which is fatal for the cylinder head.
- Also, the cylinder head is very afraid of overheating, sometimes it simply bursts.
