Cooling - Whisper Power M-SC3.5 Installation Manual

Figure 5: Internal
cooling system
1.4.2

Cooling

Intercooling is based on a raw water pump, heat
exchanger and water-injected exhaust. The generating set
should have its own sea water (coolant 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
instructions.
1 RAW WATER SUPPLY
For raw water supply the following installation materials
are required: -a skin fitting - a sea cock - a water strainer -
hoses and clamps. In order to keep the suction resistance
in the line at a minimum, the sea water intake system (i.e.
sea cock, tru-hull fitting, inlet filter, etc.) must have an
inner diameter of at least 12.5 mm diameter (1/2"). The
suction hose should be kept as short as possible. Raw
water plumbing should avoid bends as much as possible.
Restriction of raw water flow, caused by kinked hoses,
undersized pipes or connections, will reduce the engine
cooling capability. This is the main cause for overheating
of an engine. After running the generating set for the first
time, check the coolant flow rate using a stopwatch and by
holding a pail of a known volume under the wet-exhaust
outlet. The flow rate should be 8 to 12 litres /min.
2 INSTALLATION OF THROUGH HULL FITTING
It is good practice for yachts to use a hull inlet fitting with
an integrated strainer (water scoop). For propulsion
engines in motorboats the water scoop is often mounted
against the sailing direction to induce more water intake
for cooling.
EN / M-SC3.5 / September 2010
1 Water level
2 Water/exhaust separator
3 Seacock
4 Waterlock
the following installation
max.
120 cm
5 Air vent;
6 Water strainer;
7 Seacock.
This should not be done in the case of a
generating set! When sailing at higher
speeds, water will be forced into the inlet
and your generating set will overflow!
Figure 6: Installing water intake
On motorboats and on sailing boats the water scoop for a
generating set should be fitted with the opening faced
backwards to prevent water being forced in during sailing.
Use a sealant when mounting the skin fitting.
3 WATER STRAINER
Use an appropriate water strainer with connections of 12.5
mm (1/2"). Install the water strainer in a well accessible
position, (refer to figure. 5, ref 6) 5 cm above the waterline.
INSTALLATION
min.
60 cm
7