The MAN D2156 is a joint Hungarian-German diesel engine that uses water cooling and direct injection of a combustible mixture.
Ikarus 250 buses frequently use this engine. The water-cooled RABA-MAN D 2156 features a combined forced lubrication system. A Bosch fuel pump, an STA injection regulator, and injectors power the fuel system. A cyclone pre-filter and an oil bath air cleaner are used to clean the air.
Specifications
| Manufacturer | MAN |
| Also called | D2156 |
| Production years | 1971 |
| Configuration | Horizontal diesel 6-cylinder naturally aspirated engine |
| Number of cylinders | 6 |
| Firing order | 1 – 5 – 3 – 6 – 2 – 4 |
| Compression ratio | 17 |
| Piston stroke, mm | 150 |
| Cylinder bore, mm | 121 |
| Displacement, cc | 10344 |
| Power output, hp | 192 / 2100 |
| Torque output, Nm / rpm | 695,5 / 1300 |
| Weight, kg | 965 |
Although the RABA-MAN D 2156 engine has respectable dynamics (100 km/h), its low power results in poor acceleration. This motor is easy to maintain, dependable, and straightforward. Its drawbacks include a limited resource, which is also a result of the motor’s low power and, consequently, continuous high-speed operation. Transport on such engines gets increasingly smoky and noisy over time due to muffler burnout or improper engine operation.
Main engine elements
- Starter;
- Crankcase ventilation pipe;
- Generator;
- Alternator V-belt tensioner;
- Power steering pump V-belt tensioner;
- Equalizing air cylinder;
- Oil cooler;
- Air compressor;
- Location of engine number and type designation.
- Water pump;
- Tachometer sensor;
- Power steering pump;
- Fuel pump;
- Oil filter;
- Cylinder head cover;
- Place of connection of the starting device;
- Oil filler neck;
- Flywheel housing;
- Cooling water manifold;
- Oil dipstick;
- Timing gear cover.
MAN D2156 engine reference data
| Compression ratio | 17 |
| Cylinder Sequence | 1-5-3-6-2-4 |
| injection pump | inline |
| Pump | piston |
| Speed controller | dual mode |
| Air Filter | dry, with removable paper element and clogging indicator |
Explanation of marking MAN D 2156
| D | The fuel that the engine runs on is diesel |
| 21 | Cylinder diameter, mm – 121mm |
| 5 | Piston stroke, mm – 150mm |
| 6 | Number of working cylinders |