MR 700
8
Ed. 3 - 2012_11
English
TECHNICAL INFORMATION
ENGINE GENERAL DESCRIPTION
Engines of model MR704-MR706 have
been designed and built to be installed in
vessels as inboard engines.
The engines are used to equip offshore
vessels for professional and/or civil use.
The engines differ from each other in
terms of power and performance (see
“Specications”).
A few accessories are supplied with the
engine (see “Standard components”).
Main components
A) Cooler: It cools down the coolant
and the reversing gear oil through a heat
exchange with seawater.
B) Cooler: It cools down the fuel through a
heat exchange with seawater.
C) Cooler: It cools down the engine oil
through a heat exchange with seawater.
D) Turbo device: Made up of a turbine
which exploits a part of the exhaust gas
energy to carry out the engine turbochar-
ging.
E) Intercooler: It cools down the air
needed for engine turbocharging through a
heat exchange with seawater.
F) “waste-gate” valve: It controls the
turbo device activation, depending on the
pressure of the exhaust gases.
G) Wet exhaust gas sleeve: It cools down
the exhaust gases through a heat exchan-
ge with seawater.
H) Air intake lter: It traps any impurity
J) Heat expansion valve: It adjusts the
water temperature according to the engine
working temperature
K) Electrolytic zinc: It absorbs the galva-
nic currents
L) Fuel lter: It traps any impurity
L1) Oil lter: It traps any impurity
M) Oil sump: It contains the engine lubri-
cation oil
N) Electronic control unit: It controls the
engine functions
P) Water pump: It feeds the freshwater
cooling circuit
___________________________________
Q) Water pump: It feeds the seawater
cooling circuit
R) High pressure injection pump: It feeds
the injectors with fuel under pressure
S) Injector: injects fuel under pressure into
the combustion chamber.
S1) Rail: stores pressurised fuel and distri-
butes it to the injectors.
T) Transmission belt: It drives the service
parts
T1) Belt tensioner: It keeps the belt con-
stantly tensioned
U) Expansion chamber: It contains the
freshwater circuit coolant
U1) Expansion chamber plug: It is used to
rell the coolant. It is tted with an overpres-
sure valve set to 1 bars to drain any residual
pressure.
V) Alternating current generator:
It
produces and regulates the electric system
voltage
V1) Starter: It is used to start the engine
W) Fusebox: the engine is equipped with
(resettable) safety fuses, which cut out in
the event of overload or shortcircuit cur-
rents, to prevent damage to the electrical
components.
X) Boiler connection: It is used to connect
the boat’s rooms to the heating system.
Y) Seawater inlet: It collects seawater to
cool down the engine
Z) Exhaust manifold: It is used to expel the
combustion gases
Z1) Water manifold: It is used to collect the
coolant from the heads
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