The auxiliary blowers will start operating con-
secutively before the engine is started in order to
ensure sufcient scavenge air pressure to obtain
a safe start.
Further information is given in Chapter 4.
Exhaust Turbocharger
The engines can be tted with either MAN Diesel,
ABB or Mitsubishi turbochargers.
The turbocharger choice is described in Chapter
, and the exhaust gas system in Chapter 5.
Reversing
Reversing of the engine is performed electronical-
ly, by changing the timing of the fuel injection, the
exhaust valve activation and the starting valves.
The Hydraulic Power Supply
The hydraulic power supply (HPS) is tted on the
aft end, and at the middle for engines with chain
drive located in the middle, ie. large cylinder num-
bers. For engines with chain drive aft, the HPS is
located aft.
Hydraulic Cylinder Unit
The hydraulic cylinder unit (HCU), one per cylinder,
consists of a support console on which a distribu-
tor block is mounted. The distributor block is t-
ted with a number of accumulators to ensure that
the necessary hydraulic oil peak ow is available
for the Electronic Fuel Injection.
The distributor block serves as a mechanical sup-
port for the hydraulically activated fuel pressure
booster and the hydraulically activated exhaust
valve actuator.
Fuel Oil Pressure Booster and
Fuel Oil High Pressure Pipes
The engine is provided with one hydraulically acti-
vated fuel oil pressure booster for each cylinder.
Fuel injection is activated by a proportional valve,
which is electronically controlled by the Cylinder
Control Unit.
Further information is given in Section 7.0.
Fuel Valves and Starting Air Valve
The cylinder cover is equipped with two or three
fuel valves, starting air valve, and indicator cock.
The opening of the fuel valves is controlled by
the high pressure fuel oil created by the fuel oil
pressure booster, and the valves are closed by a
spring.
An automatic vent slide allows circulation of fuel
oil through the valve and high pressure pipes
when the engine is stopped. The vent slide also
prevents the compression chamber from being
lled up with fuel oil in the event that the valve
spindle sticks. Oil from the vent slide and other
drains is led away in a closed system.
The fuel oil highpressure pipes are equipped with
protective hoses and are neither heated nor insu-
lated.
The mechanically driven starting air distributor
used on the MC engines has been replaced by
one solenoid valve per cylinder, controlled by the
CCUs of the Engine Control System.
Slow turning before starting is a program incorpo-
rated into the basic Engine Control System.
The starting air system is described in detail in
Section .0.
The starting valve is opened by control air and is
closed by a spring. The integrated Engine Control
System controls the starting valve timing.
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