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2�7�2 Fuelliftpump
All models are fitted with an external fuel lift pump. therefore
the tank can be installed at a lower level than the generating set
(see Figure 7). The maximum suction height is 0,6 m. The pump
should be mounted close to the tank, in an angle or vertically to
prevent air bubbles from blocking the system.
Fig.5: Fuel line assemblies with pump mounted vertically or
in an angle
2�7�3 Fuelpipes
When the tank is above the genverter (Figure 4) we recommend
ending the return line on the top of the tank. When the return is on
the top, siphoning of the return line is impossible in case of a leak-
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age. Only the fuel supply line will need to be fitted with a fuel cock.
When the tank is below the genverter (Figure 3) we recommend
ending the return line on the bottom of the tank below the inlet
of the supply line. This will prevent the fuel supply line from being
drained into the tank when the engine is stopped because air cannot
enter into the return line, thus avoiding starting trouble.
Both supply and return fuel pipe lines should be made of appropri-
ate material and have an 8 mm inner diameter. The quality of the
tubing of fuel pipes may be subject to local regulations depending on
the application of the vessel.
The fuel pipes can be connected to the flexible hoses which are on
the genverter and are prepared to be fitted to 8 mm pipe. The result-
ing fuel line complies with CE standards as well as ISO 7840 A2.
It is important to avoid bends in the pipes, as they could trap air
bubbles. The return pipe should never be connected to the suction
pipe. The return line should be of 8 mm diameter and go straight
back via the top to the bottom of the tank. When the return is too
narrow, has too many bends and goes back to the bottom of the fuel
tank (i.e. bypassing the top), the back- pressure may be too high.
This results in irregular running of the engine. When the engine runs
irregularly, check if back-pressure is the problem by disconnecting
the return line just outside the canopy and draining it in a canister.
When the engine runs smooth now, the return piping has to be
changed. It could also help to install a second (electrical 12V) fuel lift
pump in the supply line to increase the pressure.
2�7�4 Fuelfilters
A fine fuel filter is installed which requires maintenance. Whisper-
Power recommends installing an extra fuel filter/ water fuel separa-
tor near the fuel tank.
Piccolo 6 Marine Diesel Genverter
2�8 COOLING
2�8�1 General
For cooling a modern engine in a vessel, two methods are
available: intercooling and keel cooling. Keel cooling is basical-
ly a direct extension of the engine's internal cooling system.
Intercooling, on the other hand, is based on a raw water pump,
heat exchanger and water-injected exhaust. Cooling liquid in the
internal cooling system is cooled in a heat exchanger by outboard
water (raw water or seawater). After the raw water is warmed up
in the heat exchanger it is dumped overboard by injecting it in
the exhaust.
2�8�2 Theinternalcoolingsystem
The internal cooling system should be filled with long-life G12+
cooling liquid. As the engine warms up the liquid expands and
the system is pressurized. When the pressure is sufficiently high,
the release valve in the filling cap on the manifold opens and the
expanding liquid is pressed into the expansion tank that is in the
delivery. Also the air in the system that is collected at the top of
the manifold is released in this way. When the liquid cools down
there will be under-pressure. Another valve opens and the liquid
is sucked into the manifold again. This system works only when
there is enough liquid initially.
This has to be checked when commissioning the generator set.
By filling up the expansion tank when necessary there will always
be enough liquid in the system. The hose that is in the delivery
has to be connected to the connection on the side of the filling
cap. This is a non-kinking hose made of heat resistant plastic.
The hose passes through a hole in the base.
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Fig.6: Expansion tank placement
The tank has to be placed close to the generator. When it is
mounted above the top of the manifold the liquid in the tank will
be drained when the cap on the manifold is taken off. When keel
cooling or radiator cooling is used, the system will not be pressur-
ized and a cap without release valve should be applied.
Stage V certified / EPA / Tier 4
Beforestartingyourgenverterforthefirsttime
followthefuelsystembleedingprocedureinthe
user'smanual
7
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