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MWM AKD 112 Z

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MWM AKD 112 Z
Overview
ManufacturerMotorenwerke Mannheim
Production1955–1960
Layout
ConfigurationStraight-2
Displacement1810 cm³
Cylinder bore98 mm
Piston stroke120 mm
ValvetrainOHV
Combustion
Operating principleDiesel
Fuel systemDirect injection
Fuel typeDiesel oil 45< CN, (Petroleum, Gas oil, Kerosine, Paraffin)
Cooling systemAir-cooled
Output
Power output16.2 kW at 2000 min−1 (DIN 70020)
Specific power9 kW·dm−3
Torque output89.2 Nm at 1500 min−1
Chronology
PredecessorMWM AKD 12 Z
SuccessorNone

The MWM AKD 112 Z is an air-cooled two-cylinder inline diesel engine produced by MWM from 1955 – 1960.[1] One, three and four cylinder variants of the same engine family were also produced by MWM.

Description

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The AKD 112 Z is an air-cooled, two-cylinder, four stroke diesel engine with overhead valves. The letter Z means Zweizylinder, German for two cylinders.

The crankcase is a single cast piece, the drop-forged crankshaft with screwed on counter weights is supported in bearings made of steel-lead-bronze. The crank and shaft pins of the crankshaft are heat-hardened. Due to the air-cooling of the engine, the cylinders have cooling fins made of centrifugal cast metal. The combustion chamber of the engine is a part of the piston bowls, as the engine is direct-injected. The pistons are made of a special highly heat resistant light metal alloy, they have three piston rings and one oil control ring. The bigger conrod eyes are made of steel-lead-bronze, the upper smaller conrod eyes are made of special-bronze. The camshaft is supported by rolling bearings. The overhead valves are actuated by rockers and pushrods. The cylinder head is a single piece made of a chill cast, highly heat resistant light metal alloy. The engine's air filter is a wire-gauze type air filter. For dusty environments MWM offered an oilbath air filter. The air intake must not draw in hot air; this would reduce the engine's power output. The engine has a Bosch injection pump. It is controlled by a centrifugal control mechanism using a pushrod. The control trap makes it possible to change the injection time at the engine start-up to pump more fuel into the cylinder. A forced feed (wet sump) lubrication system lubricates the engine, powered by a gear oil pump. The oil is filtered by a strainer in the low pressure circuit, and a fine sieve strainer in the high pressure circuit. A gap filter in the high pressure circuit was also available. Being air-cooled, the AKD 112 Z has an axial cooling fan powered by the crankshaft using a belt. The power can be taken off the flywheel or the PTO-shaft. An electric motor can be used to start the engine, but a crank starting is standard. The AKD 112 Z has a decompression starting aid system. Being direct-injected, it does not have glowplugs.

MWM AKD 112 Z in a Wesseler WL24, 1955
AKD 112 Z
Production period 1955 – 1960
Engine configuration Straight two-cylinder four-stroke diesel engine
Valvetrain Overhead valves, actuated by pushrods and rocker arms
Bore × Stroke,
Displacement
98 × 120 mm
1810 cm³
Maximum power output at 2000 min−1 24 PS (17.7 kW)
Rated power output at 2000 min−1 22 PS (16.2 kW)
Maximum torque at 1500 min−1 9.1 kp⋅m (89.2 N⋅m)
Specific fuel consumption at highest torque 251.2 g/kWh ±10 %

References

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