Mercedes-Benz M 159
| Daimler-Benz AG | |
|---|---|
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| M 159 | |
| Production period: | 1940s |
| Manufacturer: | Daimler-Benz AG |
| Working principle: | Otto |
| Motor design: | R6 |
| Valve control: | OHV |
| Displacement: | 2594 cm 3 |
| Mixture preparation: | Solex 32 JFF |
| Engine charging: | no |
| Power: | 44.1 kW |
| Dimensions: | 225 kg |
| Previous model: | none |
| Successor: | none |
The Mercedes-Benz M 159 is a gasoline engine from Daimler-Benz AG that was developed for light commercial vehicles up to 1.5 t and large passenger cars.
technology
The M 159 is a naturally aspirated in-line six-cylinder engine with spark ignition , OHV valve control , wet sump lubrication and water cooling that works according to the four-stroke process . With a cylinder bore of 80 mm and a piston stroke of 86 mm, the engine has a total displacement of 2594 cm 3 . Its rated output is 60 hp (44 kW) at 3000 min -1 .
Motor housing and motor drive
The engine housing is made up of three parts: the lowest part is the light metal oil pan, which is ribbed for better oil cooling. A kind of “frame” sits on the oil pan that can be separated from the engine block on top for servicing the engine. This frame is intended to improve the seal between the crankshaft and the flywheel. The engine block with the cylinders is made of gray cast iron and is placed on the frame. The crankshaft runs between the frame and the engine block in four steel shell bearings with white metal spouts , the front bearing is a locating bearing. The bearing caps are attached to the engine block with two screws each. The cover of the gear case for the camshaft drive is screwed onto the front of the engine. The camshaft is slightly below the center of the engine in the engine block. From the main oil line drilled into the engine block, branches lead to the bearings of the camshaft and the crankshaft. The pistons are supplied by Mahle and are made of light metal. They each have three compression rings and one oil control ring. The connecting rod bearings are filled with lead bronze . Counterweights are attached to every crankshaft offset, there are no vibration dampers.
Cylinder head and valve control
The engine has one cylinder head for all six cylinders. Its cast aluminum hood is rounded to facilitate the drainage of the engine oil. At the top there is a channel closed with a cover for the ignition cables. The intake manifold is housed on the right side of the engine together with the carburettor and is heated by the exhaust manifold with two pipes that are led across the cylinder head; the exhaust manifold is on the left side of the engine. The combustion chambers in the cylinder head are hemispherical, the valves, one intake and one exhaust valve for each cylinder, hang opposite one another and are inclined, which enables a large valve head cross-section. The spark plug is led vertically from above between the valves into the combustion chamber. It is sealed to the mechanical parts of the cylinder head by sheet metal. The valves are operated by the roller chain-driven camshaft in the side of the crankcase via tappets, inclined push rods and rocker arms. Like the cylinder head, the rocker arm shafts are in one piece and run through the entire cylinder head; all rocker arms are mounted on them. The rocker arm shafts themselves are mounted on four stands. The valves are made of cast iron and are each pushed back into their original position by a spring.
Fuel preparation and ancillary units
The fuel-air mixture is conditioned by a double falling flow carburetor of the type Solex 32 JFF . The fuel feed pump, designed as a diaphragm pump, is driven by the camshaft. For wet sump lubrication , a gear oil pump is installed above the oil pan, which is driven by the camshaft via a helical gear and a shaft. The shaft extends from the camshaft diagonally downwards to the oil pump. The distributor sits on the upper end of the shaft. The oil pump sucks the oil out of the oil pan and presses it into the cavity between the shaft and its housing, from where it gets into the edge filter and then into the main oil line. The water pump is attached to the cylinder head and, together with the alternator, is driven by the same V-belt from the crankshaft.
Technical specifications
| Parameters | M 159 |
|---|---|
| Engine design | In-line six-cylinder engine |
| Working principle | Gasoline engine |
| Mixture preparation | Double falling flow carburetor Solex type 32 JFF |
| Valve control |
OHV valve control , 1 × inlet, 1 × outlet valve |
| Bore × stroke | 80 × 86 mm |
| Displacement | 2594 cm 3 |
| Rated speed | 3000 min -1 |
| rated capacity | 60 hp / 44.1 kW |
| Torque at rated speed | 140.5 Nm |
| Medium work pressure | 6.8 bar |
| Maximum working pressure | 8.1 bar |
| Compression ratio | 6.3: 1 |
| Specific fuel consumption | 334.5 g / kWh |
literature
- H. Kremser: The structure of high-speed internal combustion engines for motor vehicles and railcars . In: Hans List (Ed.): The internal combustion engine . tape 11 . Springer, Vienna 1942, ISBN 978-3-7091-5016-0 , p. 217–220 , doi : 10.1007 / 978-3-7091-5016-0 ( limited preview in Google book search).