Exhaust System - Mastervolt whisper 3,5 Installation Manual

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 propul-
sion 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 not using the generator, water will
be forced into the inlet and your generating
set will overflow!
sailing direction
WRONG!
Fig. 5.
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 du-
ring sailing. Use a sealant when mounting the skin
fitting.
3 WATER STRAINER
Use an appropriate water strainer with connections of
1/2" (12.5 mm). Install the water strainer in a well ac-
cessible position, (refer to fig. 4-6) with the top 2 - 4
inches (5-10 cm.) above the waterline.
4 SIPHON BREAKER (AIR VENT)
When the point of water injection is below the water-
line, 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 ge-
nerating set is designed to accommodate a siphon
breaker (air vent). In the standard delivery the con-
nections are bypassed. Hose of 1/2" (12.5 mm) inner
diameter should be used.
USA / WHISPER 3,5 / April 2004
thru-vessel inlet
flow direction
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.
Extend the water hose of the by-pass 2 ft. (60 cm)
above waterline and install an air vent (refer to fig.
15). 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). The hose of the drain
should go downwards. Water must flow out freely; air
must flow in freely as well.
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!
DAMAGE CAUSED
WATER IN THE ENGINE IS NOT COVERED BY
WARRANTEE
On the valve is a little hose to drain a little water that
could be spilled from the valve. This hose should go
down and may not end under water, because it
should ventilate air into the valve to break the
siphoning.
Check the air vent at regular intervals. Open, clean
and lubricate the valve as required (fig. 6).
Fig. 6.
1.4.3

Exhaust system

Water is injected in the exhaust system of the generating
set. In this way the cooling water that has passed the
heat exchanger is mixed with the exhaust gases.
Temperature and volume of the gases are thereby
reduced considerably, so that a rubber exhaust hose can
be used and the level of noise is reduced as well.
INSTALLATION
BY THE INGRESS OF
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