Product Description; Description Of The Engine; Fuel System; Exhaust System - MTU 20 V 4000 M93 x Operating Instructions Manual

2.2 Product description

Description of the engine

Engine
The engine is a liquid-cooled four-stroke diesel engine, rotating counterclockwise (seen from 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
single injectors with integrated individual store.
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 amount of heat to be dissipated by the coolant,
• absolute gas-tightness.
Turbocharging
Sequential turbocharging with internal, engine-coolant-controlled charge air cooling. The right-hand ex-
haust turbocharger is cut-in and cut-out on 12V and 16V engines with electronically-controlled, hydraul-
ically-actuated flaps. ETC B1 A2 and B2 on 20V engines.

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 at 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
• Coolant expansion tank (20V 4000 M03 only, not installed on engine).
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).
MS150048/04E 2013-07 | General Information | 19