In order to replace the M103 E26, the Mercedes M104 E28 engine was created based on the M104 E32. The 3.2-liter’s cylinder block now has a new crankshaft with a 73.5 mm piston stroke.
M103 E26, M103 E30, M104 E28, M104 E30, M104 E32, and M256 E30 are members of the R6-family.
With a variable valve timing system at the inlet, the cylinder head resembles the M104 E32. Distributed injection is a fuel injection system. manifold of intake with variable geometry. A dependable two-row chain is used in the timing system.
Specifications
| Production years | 1992-1998 |
| Displacement, cc | 2799 |
| Fuel system | injector |
| Power output, hp | 193 – 197 |
| Torque output, Nm | 265 – 270 |
| Cylinder block | cast iron R6 |
| Block head | aluminum 24v |
| Cylinder bore, mm | 89.9 |
| Piston stroke, mm | 73.5 |
| Compression ratio | 9.2 – 10.0 |
| Features | no |
| Hydraulic lifters | yes |
| Timing drive | chain |
| Phase regulator | at the intake |
| Turbocharging | no |
| Recommended engine oil | 5W-40 |
| Engine oil capacity, liter | 7.0 |
| Fuel type | petrol |
| Euro standards | EURO 1/2 |
| Fuel consumption, L/100 km (for E280 W124) — city — highway — combined |
14.5 11.0 12.5 |
| Engine lifespan, km | ~500 000 |
| Weight, kg | 195 |
Disadvantages of the M104 E28 engine
Numerous oil leaks are the primary issue with power units in this series.
First, the U-shaped, cylinder head, and oil filter heat exchanger gaskets leak.
The fan’s viscous coupling frequently fails, posing a serious risk to the engine.
This motor is so terrified of overheating that the cylinder head bends almost instantly.
Ignition coils and under-the-hood wiring will cause you a lot of problems.