Iveco Marine Diesel Engines, Руководство по установке

Страница: 128 / 132

Controls during navigation should be preceded by the following preliminary controls:
■
Check that the remote controls of the injection pump accelerator lever and the reverse selector
lever are adjusted to ensure a complete stroke. It is worth remembering that an incomplete stroke
of the accelerator lever reduces the engine performance, whereas a partial stroke of the reverse
lever results in an inaccurate closure of clutches, which causes early wear and tear.
■
Verify that no objects are touching the rotating parts and check for no fluid leakage.
■
Check that the fluids levels match the required parameters.
■
Check that the seacock valve is open, and that the seawater discharge system works properly while
the engine is running.
■
Adjust the rev-counter on board using a digital or manual rev-counter.
14.3 OPEN SEA TESTS
The tests and measurements to be carried out may vary according to the use given to the vessel and
the installation particularities, which may require specific inspections.
Some tests described below are essential and recurrent in cer tain types of installations, and they
are useful to assess impor tant parameters to guarantee the engine proper operating conditions and
reliability.
The tests will yield significant results only if the vessel sails at optimal operating conditions, or if it is fully
equipped, with the water and fuel tanks filled up, and also with the engine compartment hatches closed
so that ventilation is only carried out through the corresponding air vents and ports.
Power absorption curve
The engine power output can be assessed by checking against an appropriate chart the exhaust gases
temperature values measured before they reach the turbine, in the case of a supercharged engine and
according to the engine rotation speed.
In the case of engines fitted with electronic control, an inverse procedure may be carried out taking
from the ECU in the EDC system the fuel intake values at different rates, as indicated in the checklist.
The test is carried out during sailing in still water, following a straight route and taking the gas temper-
ature values at different levels, for example every 200-rpm within the range of use, after reaching sta-
bilisation. Temperature measurements may be accompanied by vessel speed and, in the case of gliding
hulls, by vessel pitch measurements.
Supercharging pressure measurements is optional.
These test results are useful to assess the propeller performance, according to the description in
Section 3.
In the case of gliding hulls, it is important to measure the time needed to glide and set the engine at
complete gliding rate, or engine deceleration rate.
Fuel consumption values can be deduced from the obtained measurements in order to estimate
autonomy.
In the case of engines supplied with electronic control injection system, it is possible to assess the main
burning air pressure and temperature, the coolant temperature and the amount of injected fuel using
the diagnosis instrument that can be found on the technical / commercial IVECO network.
Testing the cooling and venting systems installation
The test is not generally carried out in the case of engines with standard cooling system installation
(water/water heat exchanger and secondary seawater heat exchanger). In these cases, only the engine
coolant temperature is measured to the cylinder head exit during the maximum power test.
If there are uncertainties regarding the seacock fitting efficiency, the seawater pump vacuum capacity
should be assessed.
MARCH 2004 CONTROL TEST PROCEDURES
14.128
MARINE ENGINES INSTALLATION