MWM AKD 112 Z
The MWM AKD 112 Z is an air-cooled in-line two-cylinder diesel engine from Motoren-Werke Mannheim AG (MWM). The engine was supplemented upwards and downwards by one, three and four-cylinder variants from the same type family.
| Motoren-Werke Mannheim AG | |
|---|---|
 AKD 112 in a Renault V72 |
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| AKD 112 Z | |
| Production period: | 1955-1960 |
| Manufacturer: | Motoren-Werke Mannheim AG |
| Working principle: | diesel |
| Motor design: | Standing in- line engine |
| Displacement: | 1810 cm 3 |
| Mixture preparation: | Direct injection |
| Engine charging: | no |
| Power: | 16 kW |
| Max. Torque: | 84 Nm |
| Previous model: | AKD 12 Z |
| Successor: | none |
technology
The AKD 112 Z is an air-cooled four - stroke diesel engine with two cylinders in line and a side camshaft . The code letter Z stands for two-cylinder . A cylinder bore of 98 mm and a piston stroke of 120 mm results in a displacement of 1810 cm 3 .
The crankcase of the engine is cast in one piece, the drop-forged crankshaft mounted in it runs in plain bearings made of lead-bronze steel. Of them are counterweights bolted, the shaft and crank pins are burning hardened. Since the engine is air-cooled, the cylinders made of centrifugal casting are provided with cooling fins . With the AKD 112 Z , the fuel is injected directly ; the combustion chambers are completely in the piston recess . The pistons are made of a heat-resistant light metal alloy and have three piston rings and two oil control rings . The connecting rods are drop-forged and diagonally divided, the large connecting rod eyes made of steel-lead bronze are divided, the small connecting rod eyes are made of special bronze. The camshaft below runs in roller bearings and actuates the hanging valves via tappets , push rods and rocker arms . The cylinder head is a chill casting made of a highly heat-resistant light metal alloy. The engine's intake air is cleaned of dirt with a wet air filter. An oil bath air filter was also available for particularly dusty applications . The air filter is placed far away from the exhaust so that no exhaust gases get into the engine, otherwise the output of the engine will decrease. The diesel fuel is supplied by the self-priming Bosch type PFR plug-in injection pump , which is driven directly by the camshaft and controlled by a centrifugal governor via a control rod. With the "regulator trap", the injection timing can be changed when the engine is started so that a larger amount of fuel can be delivered beforehand. The motor is lubricated by pressure circulation lubrication with a gear oil pump. A screen filter in the oil suction line and a fine screen filter in the pressure line serve as filters . Alternatively, a gap filter can also be installed in the pressure line. An axial fan is used to cool the engine and is driven by a V-belt from the engine's crankshaft. The torque can be taken from the flywheel as well as from the cranking side. The engine is started either by hand with a crank or with the help of an electric starter . A decompression device is installed as a starting aid . Since the AKD 112 Z is a direct injection engine, it has no glow plugs .
Fuels
- The MWM AKD 112 Z can be operated with the following fuels
- Diesel engine oil
- petroleum
- Gas oil
- crude oil
- Texas oil
- Yellow paraffin oil
- Brown paraffin oil
- Or a fuel that does the following
- Lower calorific value: 41.868 MJ
- Specific weight: 0.83-0.88
- Flash point: at least 55 ° C
- Ash content: less than 0.03 percent by weight
- Sulfur content: less than 1 percent by weight
- Viscosity: max. 3 ° E at 20 ° C
- Cetane number: at least 45 CZ
- Pour point: below −20 ° C
- Water content: maximum 0.5%
- Coke residue: maximum 1%
- Up to 350 ° C, at least 80% must pass over during the distillation
Technical specifications
| AKD 112 Z | |
|---|---|
| Engine type | Vertical two-cylinder in-line engine |
| Working principle | Four-stroke diesel |
| Valve control | OHV , tappets, bumpers, rocker arms |
| Mixture formation | Direct injection, Bosch in-line injection pump |
| Bore × stroke, displacement |
98 x 120 mm 1810 cm³ |
| Nominal power according to DIN 70020 | 22 hp (16.2 kW) at 2000 min -1 |
| Maximum output over 1 hour according to DIN 70020 | 24 hp (17.7 kW) at 2000 min -1 |
| Specific fuel consumption at maximum torque | 251.2 g / kWh + 10% |
literature
- Operating instructions for the air-cooled small diesel engine AKD 112 one and two cylinder . MWM Motoren-Werke Mannheim AG. Vorm. Benz Dept. Stat. Engine construction. June 1955