insTAllATiOn direcTiVe
6
MAY 2006
N45 MNA M10
N67 MNA M15
24. FIRST ENGINE START
Before starting the engine, please make sure the sea water
gate valve is open, check the levels of the lubricating oil and
of the engine coolant, and complete venting the air from the
fuel feed loop, acting on the hand pump of the pre-filter or
with the aid of a dedicated electrical pump.
Loosen the vent fitting on the pre-filter and operate the
pump until only fuel without air flows out.
Tighten the vent fitting and continue pumping during the
initial start-up phases.
Make sure that the fuel that flows out of the fitting is not
dispersed in the environment.
NOTE
A few moments after start-up, make sure sea water is cor-
rectly drained from the relevant circuit.
Once the first start-up phase is complete, verify that:
o
There are no liquid leaks from the coolant loop pipeline
junction hoses.
o
There are no exhaust gas leaks into the hull.
o
Complete the instrument panel operation tests as
described in the related Chapters.
o
Verify that the power supply voltage across the battery,
after about 15 minutes with the engine running, is no
less than about 13 V.
25. UNDERWAY CHECKS
Engine compartment vacuum
Verify that value of ambient air pressure in the engine room
with the engine(s) at full load and maximum power output
complies with the value specified herein.
Combustion air temperature
Verify that the temperature in the engine room, after 30
minutes underway at full engine power, does not exceed
40 °C and, in any case, does not exceed the value of external
temperature by more than 15 °C.
Exhaust back-pressure
Verify that the value of back-pressure present at the inlet of
the exhaust gas conduit, with the engine(s) at full load and
maximum power output, complies with the value specified
herein.
Exhaust temperature
Verify that the temperature of the exhaust gases under
maximum engine power output conditions is close to the
prescribed value.
Fuel temperature
Verify that the temperature of the fuel in the low pressure
line, while underway at full power and with a stable quantity
of fuel in reserve, does not exceed 60 °C, an upper value
would result in a reduction of the cooling power of the injec-
tion pump parts.
If the tendency to reach the maximum allowed temperature
is noted, install a heat exchanger for the fuel.
Pressure in the fuel supply line
To assure the regular operation of the engine and the reli-
ability of the components of the fuel supply and injection
system, you need to verify that:
o
vacuum in the fuel oil supply line to the low pressure
pump is less than 0.15 bar relative 1500 mmH
2
O);
o
pressure in the fuel oil return line to the tank is less than
0.1 bar relative (1000 mmH
2
O).
Measures are carried out inserting a “T” junction near the
fuel inlet and outlet, taking care to avoid any air suction. Val-
ues are read at variable rpm, from idle to maximum, at 200
rpm intervals.
If there are any symptoms indicating the possible presence of
air in the fuel supply line, a check may be made by inserting
a clear tube, arranged as an inverted U, before the engine
inlet junction.