Man D2842 LE103, Руководство по эксплуатации

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Design and Function
MAN-Industrial diesel engines D2842 LE103
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Carefully read the Operating Instructions before starting any work!
This is especially valid for the chapter on General Safety Instructions
and the safety instructions in each of the chapters.
4 Design and Function
4.1 Engine, General
The 12 cylinder engines described here are liquid-cooled 4-stroke cycle diesel engines with turbocharging
and intercooling.
Engine Monitoring
Monitoring of the engine is made through various sensors. The sensors are designed, for example, as rpm
and temperature sensors, which report the various operating conditions of the engine to the engine control
unit. The engine control unit operates according to the EVA principle:
E = Eingang (Input)
V = Verarbeitung (Processing)
A = Ausgang (Output)
The engine control units process the information received from the sensors and control the output signals
which are sent to the actuators. The actuators convert the signals into mechanical factors.
Engine Lubrication
Pressure feed lubrication with one lube-oil pump for the bearings of the crankshaft, connecting rods and
camshafts as well as piston pin sockets, roller tappets and rocker arms.
Oil filtering through a filter module with integrated oil cooler and crankcase ventilation in the main flow. Aux­
iliary equipment, such as series high pressure pumps, turbochargers and power take-offs are connected to
the engine lubrication oil circuit.
Cooling System
The cooling circuit takes the form of a thermostat-regulated forced circulation cooling system. The mainten­
ance-free coolant pump is mounted on the front of the crankcase and is driven via a V-belt.
The thermostats are fitted in the coolant pump. The thermostats take the form of a replaceable insert.
Intake and Exhaust System
The dry exhaust pipes ate attached to the cylinder head. From the high pressure stage the exhaust gases
pass to the exhaust gas turbocharger.
Control of the waste-gate valves takes place directly via the charge pressure. Lubrication of the exhaust
gas turbocharger takes place via the main engine oil circuit to the oil pressure connection on the turbochar­
gers.
The intake air is routed through the air filter to the turbochargers. The pre-compressed charge air is then
routed to the engine.
Fuel System, General
The fuel system is divided into a low-pressure and a high-pressure system.
The fuel lines, manual pump and the fuel filters are all part of the low-pressure system.
The interface to the high pressure system is provided by the fuel delivery pumps flange-mounted on the
high pressure in-line pump.
The high pressure system consists of the high pressure in-line pump, which is supplied from the flange-
mounted supply pumps, the high pressure lines and the injection nozzles.