MTU 20V4000M73 series, Operating Instructions Manual

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2.3 Product description
Description of the engine
Engine
The engine is a liquid-cooled four-stroke diesel engine, rotating counterclockwise (as viewed on driving end),
with direct injection, sequential turbocharging and charge-air cooling.
The engine is monitored by an engine control and monitoring system (ADEC).
Monitoring in the engine room is carried out by the engine control and monitoring unit (LOP).
Fuel system
Electronically controlled common-rail-injection system with HP pump, pressure accumulator (rail) and injec-
tors with integrated individual accumulators.
The electronic control unit controls
• Injection start
• Injection quantity
• Injection pressure
Exhaust system
The exhaust system is equipped with triple-walled, water-cooled exhaust lines.
The triple-walled design permits
• Low surface temperature
• Reduced coolant heat quantity,
• absolute gas-tightness reached.
Turbocharging
Sequential turbocharging with internal, engine-coolant-controlled charge air cooling
The exhaust turbochargers B1, A2 and B2 are cut in and out via electronically-controlled, hydraulically-actu-
ated flaps.
Cooling system
Engine cooling as split-circuit cooling system with plate-core heat exchanger
Heating of the charge-air in idle and low-load operation prevents white smoke formation.
Seawater only flows through engine coolant and fuel heat exchanger as well as the raw water pump.
Service block
The service components are mounted on the auxiliary PTO end.
The layout permits easy access for maintenance.
Service components:
• Raw water pump, coolant pump
• Fuel duplex filter, switchable
• Automatic oil filter
• Centrifugal lube-oil filter
Electronic system
Electronic control and monitoring system with integrated security and test system with interfaces to remote
control system (RCS) and to monitoring system (MCS)
34 | General Information | MS150046/03E 2018-08
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