Fuel Filters; Cooling; General; The Internal Cooling System - Whisper Power M-GV/2 Installation Manual

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
appropriate 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 resulting 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

Fuel filters

A fine fuel filter is installed which requires maintenance.
WhisperPower recommends installing an extra fuel filter/ water
fuel separator near the fuel tank.
Before starting your genverter for the first time
follow the fuel system bleeding procedure in the
user's manual.
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 basically
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

The internal cooling system

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
M-GV/2, M-GV/3, M-GV/3+, M-GV 8, M-GV 10 and M-GV 15 — June 2017 — EN
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 canopy.
MAX.
Figure 9: 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 pressurized and a cap without release valve should be
applied.
2.8.3

Keel cooling

Keel cooling involves circulating the hot coolant through a
space in the keel, through a double walled skin of the boat,
through a box cooler, using a big tank or any other external
cooler. Keel cooling systems are extensively described in a
separate manual (art. no. 40200251). For these particular
genverters, only a single external cooler is needed.
2.8.4

Intercooling

When applying intercooling the genverter should have its own
raw water inlet and should not be connected to any other
engine systems. A properly installed cooling system is critical to
keep engine temperatures within an acceptable range. Ensure
that the installation complies with the following installation
instructions.
2.8.4.1 Raw water supply
For raw water supply the following installation materials are
required:

skin fitting
INSTALLATION
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