Product Description - MTU 12V4000M*3 series Operating Instructions Manual

3.2 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).
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 exhaust
turbocharger is cut-in and cut-out on 12V and 16V engines with electronically-controlled, hydraulically-actu-
ated flaps.
Cooling system
Split-circuit engine cooling system with remote or engine-mounted heat exchanger.
Heating of the charge air in idle and low-load operation prevents white smoke formation.
Seawater flows only through engine coolant cooler and fuel cooler as well as the raw water pump (if fitted).
Service block
The service components are mounted at the auxiliary PTO end.
The layout permits easy access for maintenance.
Service-components:
• Raw water pump (if fitted), coolant pump
• Centrifugal lube oil filter
• Coolant expansion tank (only on engines with engine-mounted heat exchanger)
• Coolant filter
Intermittent oil priming for marine genset engines (M23-M43)
The standard configuration of these engines comprises intermittent oil priming.
Oil priming is activated every 30 minutes. The oil priming process ends as soon as oil pressure in the main oil
gallery reaches 0.4 bar or after 180 seconds, at the latest.
If a pressure of at least 0.2 bar is not attained after 180 seconds, an alarm is output.
MS15036/00E 2018-08 | General Information | 25