Installation manual

INSTALLATION
EN / M-SC6/8/10 - 3000RPM / June 2010 9
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 according to the data in the user manual.
3 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.
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!
Fig. 7 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.
4 WATER STRAINER
Use an appropriate water strainer with connections of the
following dimensions:
Model Inner dimensions
M-SC6 – 3000 rpm 19 mm (3/4")
M-SC8 – 3000 rpm 19 mm (3/4")
M-SC10 – 3000 rpm 19 mm (3/4")
Install the water strainer in a well accessible position,
(refer to fig. 6-6) 5 cm above the waterline.
5 SIPHON BREAKER (AIR VENT)
When the point of water injection is below the waterline,
then -when the engine is stopped -there is a risk that the
cooling water may enter the engine as a result of
siphoning. To avoid this happening, the generating set is
designed to accommodate a siphon breaker (air vent). In
the standard delivery the connections are bypassed. See
figure 8.
Fig. 8: Bypassed siphon breaker connections
Hoses with the following inner diameter should be used:
Model Inner dimensions
M-SC6 – 3000 rpm 19 mm (3/4")
M-SC8 – 3000 rpm 19 mm (3/4")
M-SC10 – 3000 rpm 19 mm (3/4")
If the generating set cannot be mounted such that the
bottom of the generating set is placed above the waterline,
an air vent must be installed. See figure 9.
Extend the water hose of the by-pass 60 cm above
waterline and install an air vent. Ideally, the air vent should
be mounted above the yacht keel center line (i.e. to
minimize the influence of swaying on the water intake).
Fast motorboats will lay deeper when sailing at large
speed and can cause pressure on the waterinlet. This
should be avoided to prevent fleeding the engine.
If the air vent is clogged the water hoses will
not be vented when the generating set has
stopped and water can be forced into the
engine. This leads to immediate engine
problems and eventually severe damage!
SAILING DIRECTION
SAILING DIRECTION
FLOW DIRECTION
FLOW DIRECTION