Mercedes M103 engine
Content
The family of in-line 6-cylinder Mercedes M103 engines was produced from 1985 to 1993 and was installed on many company models, such as W201, W124 and luxury R107 roadsters. There were two different modifications of the power unit: E26 for 2.6 liters and E30 for 3.0 liters.
The R6 line also includes internal combustion engines: M104 and M256.
Technical characteristics of motors of the Mercedes M103 series
| Exact volume | 2597 cm³ |
| Supply system | KE-Jetronic |
| Internal combustion engine power | 160 - 165 HP |
| Torque | 220 - 230 Nm |
| Cylinder block | cast iron R6 |
| Block head | aluminum 12v |
| Bore | 82.9 mm |
| Piston stroke | 80.2 mm |
| Compression ratio | 9.2 |
| Features of the internal combustion engine | no |
| Hydraulic compensators | Yes |
| Timing drive | single strand chain |
| Phase regulator | no |
| Turbocharging | no |
| What kind of oil to pour | 6.0 liters 5W-40 |
| fuel type | AI-92 |
| Environmental class | EURO 0/1 |
| Approximate resource | 450 000 km |
| Exact volume | 2960 cm³ |
| Supply system | KE-Jetronic |
| Internal combustion engine power | 180 - 190 HP |
| Torque | 255 - 260 Nm |
| Cylinder block | cast iron R6 |
| Block head | aluminum 12v |
| Bore | 88.5 mm |
| Piston stroke | 80.2 mm |
| Compression ratio | 9.2 – 10 |
| Features of the internal combustion engine | no |
| Hydraulic compensators | Yes |
| Timing drive | chain |
| Phase regulator | no |
| Turbocharging | no |
| What kind of oil to pour | 6.0 liters 5W-40 |
| fuel type | AI-92 |
| Environmental class | EURO 0/1 |
| Approximate resource | 450 000 km |
Fuel consumption internal combustion engine Mercedes M 103
On the example of a 260 Mercedes 1990 SE with a manual transmission:
| City | 14.3 liters |
| Track | 7.7 liters |
| Mixed | 10.1 liters |
Similar motors from other manufacturers:
Which cars were equipped with the M103 2.6 - 3.0 l engine
| C-Class W201 | 1986 – 1993 |
| E Class W124 | 1985 – 1993 |
| G-Class W463 | 1990 – 1993 |
| S-Class W126 | 1985 – 1992 |
| SL-Class R107 | 1985 – 1989 |
| SL-Class R129 | 1989 – 1993 |
Disadvantages, breakdowns and problems of the M103
Most often, car owners with such a power unit are faced with lubricant leaks.
The weak points for leaks here are the U-shaped gasket and the crankshaft oil seal
The second most common problem is engine failure due to clogged injectors.
The reason for the oil burner is usually in the valve stem seals and it goes away after they are replaced
After 150 km, a single-row timing chain may already stretch and require replacement
